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Peripheral Arterial Disease

Abstract

Peripheral Arterial Disease (PAD) is currently known to be a critical cause of mortality and morbidity both in the developing and the developed economy’s countries. Despite the fact that the risk for forces for PAD are thoroughly defined and established PAD patients who in the period acquires Critical Lower Limb Ischemia (CLI) are in often cases asymptotic before the growth of CLI thus the prime forces that determine these patients outcomes are currently not apparent. Despite the advancement of treatment options for these patients, the mortality rate is particularly 25 percent where about 30 percent are required to acquire amputation. The study established that all the approaches utilized with the objective of raising the unique pro-angiogenic expression force lead to clinical failure. This paper will, therefore, focus on analyzing suitable therapies that can be utilized in inducing neovascularization in reducing procedural failure and high mortality rate.

Background and Introduction

Peripheral Arterial Disease is highly predominant, increasingly recognized and debilitating condition, estimated to affect more than 25 million individuals in western countries (Criqui, 1985 264). CLI is categorized to be the final PAD stage. It is can best be described as a medical disorder where patients with Obstructive Arterial Disease, particularly of the lower Limbs, normally acquire Chronic Ischemia resting pain, foot gangrene or ulcers (Norgren, 2007 433). The general number of patients diagnosed with PAD CLI is approximated to be amid ×and 3 percent while the annual number in America is projected to be 160,000 persons (Becker, 2011 1584). CLI patients normally accommodate numerous comorbidities alongside DM while smoking is the most essential, adding to the general high mortality level and the associate apparent economic liability (Criqui, 2001 1583). Despite the adoption of the most suitable medical treatment, which incorporates restricted risk factors control for methodical atherosclerosis, the most effective treatment standard and the only Limb treatment option in reference to CLI remains to be Revascularization.

Lower Limb Revascularization can be carried out either by conventional surgery, percutaneous endovascular approach or by a hybrid procedure which is both surgical and endovascular. Taking into account PAD´s complexity, one patient one anatomical disease pattern, the accessibility guidelines and above all factors, such as, the availability of an autologous conduit for bypass surgery, a patient-tailored approach is probably the best way for success in treating these patients. Choosing the proper therapeutic option may lead to limb salvage and survival rates above 75% in the first year post-diagnosis. However, despite the most recent years which have been characterized by multiple technological discoveries and the intuition of special and intensive care treatment units for these category of patients the mortality rate for a single year is projected to be nearly 25 percent with more 30 percent of the ailing populace necessitating  amputation (Norgren, 2007 433). The survival level for a 5 year period for the CLI patients is stated to be lower than 30 percent (Adam, 2005 812), (Hirsch, 2006 453). In addition, amongst the patients that undergo amputation around 30 percent of the populace necessitates repeated surgeries in the unchanged or on the contralateral leg within a span of 2 years (Norgren, 2007 433).

In approximately 20 to 30 percent of patients diagnosed with CLI, the distribution, comorbidities as well as arterial occlusions diffuseness leads them to be accounted as candidates that are not qualified for either endovascular or surgical revascularization procedures thus amputation is usually the only viable and available choice. Moreover, individuals with renal chronic failure as well as DM and develops CLI holds a poor Salvage Prognosis for the Limbs and it is even reasoned by a number of researchers that prime amputation is the only suitable therapeutic choice for these patient group (Sigala, 2006 1589) and (Venermo, 2011 1592). In other words, poor medical CLI prognosis, the rising CLI patient’s number, prior revascularization failure procedures and the considerable non-option CLI patient’s number have generated a growing necessity for fresh therapies to neovascularization induction. Therapeutic angiogenesis, with the most emphasis being placed on gene and cell therapy, focusing on the use of exogenous molecular and cellular agents to promote revascularization or regeneration of diseased microvasculature.

Literature Review

Even though preclinical studies and early clinical trials regarding therapeutic angiogenesis have presented promising results, single dose administration of proteins did not show lasting effects, probably because of the short half-lives of the proteins administered. Gene therapy with DNA plasmids encoding pro-angiogenic factors has been developed in order to increase the duration of transgenic expression as compared to direct administration of proteins. Despite the plasmids being adequately endured by the bodily immune system they normally result in reduced genes transfer levels with reduced transgenic expression duration. This, therefore, demonstrates that all the approaches utilized with the objective of raising the unique pro-angiogenic expression force lead to clinical failure.

    In the recent cellular therapy has gained preponderance. However, it cannot forget that DAP is associated with endothelial dysfunction and a significant reduction in the number of circulating EPCs and their function (Hill, 2003 1608). Peripheral arterial disease EPCs may not respond to pro-angiogenic factors, particularly in aged patients with DM or hypercholesterolemia (Isner, 1999 950) and (Rivard, 1999 1607). Also, concerning cell-based therapeutic strategies challenges still include questions of cell source, phenotype, preparation protocols, dosing, route and frequency of administration. In short, results shorter than expected from the more recent clinical trials may be explained as a consequence of limitations related to: (i) animal models used in basic research; (ii) patient selection and issues related to different steps in the preparation and administration of genes or stem cells; and (iii) finally, we must take into account the low physiological reserve of the critical patient suffering from a life-threatening disease (Wahlberg, 2003 1271).

    Radiation ionization, in doses that range from 2 up to 8 GY has been established to be promoting angiogenesis most often through raising pro-angiogenic expression forces like IL5, IL4, IL3, TGFβ, IL1Ra, VEGF, FGF, and IL10. This is driven by the cells tumor and micro- surrounding activation with the inclusion of vasculature (Moeller, 2004 1521), (Park, 2006 1609), (Sonveaux, 2003 1106), (Hlatky, 1994 1637), (McBride, 2004 974) and (Yoshimura, 2013 1617). Provided with the extensive utilization of radiotherapy as Malignant tumors treatment option, research has mainly been focused on gaining a more improved understanding on the grounds via which tumor vasculature is activated by IR therapeutic doses in addition to the irradiated micro surrounding  metastasis and invasion(McBride, 2004 974) and (Ciric, 2010 1643). Our research lab has demonstrated for the first time that LDIR, defined as doses lower than 0.8 Gy, induce a pro-angiogenic phenotype in ECs in vitro modulating endothelial dysfunction, promoting survival, migration and preventing EC apoptosis (Sofia Vala, 2010 938). Likewise, we showed that LDIR promotes neovascularization in vivo by inducing angiogenic sprouting in the transgenic fluorescent zebrafish Tg. Such operations mainly focused on an innovative strategy, for the vasculature that covers the tumor and acquires LDIR relativity during treatment procedures.

            The established findings were justified by the acquired data from a microarray research where several proteins encoding transcripts necessitated for procedural angiogenesis were prompted after LDIR delivery. The revelation by a global gene expression analysis demonstrated that 2374 genes were modulated by LDIR and from those, 1344, many of which with a role in angiogenesis, were up-regulated in LDIR versus control Human Lung Microvascular Endothelial Cells (HMVEC-L) at a cutoff corresponding to a P value<0.03. The biological relevance of these data was transduced in the most prominent signaling pathways related to a molecular LDIR response associated, primarily to three distinct but significant groups. 1) Development force and signaling Cytokine which regulates the proliferation, survival, distinctiveness, and migration. This incorporates TGFβ2 signaling and Epidermal Growth Factor (EGF) (Distler, 2003 667) and (Kuwano, 2001 1066). 2) Cytoskeleton-associated components involved in the arrangement of cytoskeleton, migration, and adhesion (Adams, 2010 1068), (Chien, 2005 1070), (Hashimoto-Torii, 2008 1071), (Lamalice, 2007 1073) and (Munoz-Chapuli, 2004 1074). 3) Stress-projected molecules that are mainly linked with IR projected damages. These damages play a crucial responsibility in the progression of cells and checkpoint DNA repair (Pawlik, 2004 1077).

            For those genes that their expression is altered significantly byLDIR and are a representation of the most suitable proangiogenic candidate's responses were chosen. These are VEGFR1 and VEGFR2, ANG2, TGFβ, PDGF, and FGF-2. Hepatocyte development factor as well as the respective receptor, c-MET were also validated as HGF use which has been projected in therapeutic angiogenesis setting as well as HGF medical trials gene therapies. The expressions were thus validated by real-time quantitative PCR as well as Western Blot with the utilization of non-irradiates and irradiated HMVEC-L. As soon as the 4th-hour post0.3 GY exposure majority’s expression of the chosen pro-angiogenic molecules were then risen then returned to the 12h baseline after LDIR. The short-run LDIR impact on ECs is generally independent of all fractionation doses. This is because cells that are exposed to 0.3 GY given for two, three or even four days consecutively that demonstrated similar expression gene pattern as well as magnitude.

Further, it was established that LDICR normally activates the Endothelium through phosphorylation of VEGFR2 which is an essential angiogenic process player (Sofia Vala, 2010 938). Based on the results it can thus be described can VEGFR2 activation results in speedy activation of differing cellular proteins and correspondingly to mRNA de novo and the expression of protein mediators that are incorporated in angiogenic responses (Zachary, 2003 1383) and (Zachary, 2001 1623). Accordingly, the signaling pathways like Threonine/Serine and Signal extracellular controlled Mitogen Kinase protein are thus activated while the modulation of gene expression occurs.

Results/Discussion

            Given these findings, we aimed at testing an innovative non-invasive strategy, using LDIR to induce therapeutic angiogenesis in vivo in a murine HLIM.

            Preclinical studies aimed at evaluating the efficacy of potential new pharmacological agents in the field of therapeutic angiogenesis include several categories of both In-vivo and In-vitro evaluations. EC tubule creation evaluation is mainly significant for the new therapeutic components screening given that it is efficient on cost, not demanding technically, suitable to the extensive scrutiny scale and permits the testing of cells derived from humans (Staton, 2009 1650). However, an in vivo model translates in a more precise way the high complexity of the human body; the vasculature of the skeletal muscle is a three-dimensional structure that includes capillaries and larger vessels consisting of pericytes, ECs, monocytes as well as leveled muscle cells that associated with the matrix extracellular. Consequently, neovascularisation signifies the harmonious association of these components with the micro surrounding (Staton, 2009 1650) and (Hudlicka, 1992 1652). As per the current, animal based limbs approaches ischemia are accounted to being the most suitable CLI conditions mimic, in the local hemodynamics like shear stress and blood flow, determine limb-generated response to ischemia as well as to the therapeutic agents under study.

            HLIM normally incorporates arterial supply acute interruption while it remains to be the most utilized pre-medical in-vivo strategy for angiogenic as well as arteriogenic evaluation of the possible agents and respective cells (Aranguren, 2009 1653) and (Hudlicka, 1994 1654). Rodent tends to be the most often utilized but regardless porcine, primate, rabbit and canine models have additionally been discussed. The utilization of small sized animals like rodents specifically the mouse holds advantages based on the increased transgenic strains availability and experimentation reduced cost. Despite HLIM being accounted to be associated with more medical relevance in relation to PAD and particularly CLI, it does not completely generate the human condition that has complexity. There are differing HLMs murine for angiogenesis testing. Mild ischemia approaches and severe ischemia approaches are present. Occlusion levels variations normally incorporate iliac ligation, ligation femoral, under the branches, ligation femoral with branches excision, vein stripping and dependent variation approach (Goto, 2006 1646) and (Masaki, 2002 1648). Variation in this model kind leads in differing ischemia’s pattern as well as reperfusion (Hellingman, 2010 1649).

            In this study, we adopted the model described by Couffinhal et al. (Couffinhal, 1998 928) that Lofti et al. (2013 p.1657) recognized as the most suitable method for ischemia’s induction in signs production in the mouse similar to the observed and analyzed one in Human CLI. The model is made of distal external iliac ligation as well as femoral and middle segment excision. For reproducibility of the model and since we adopted C57BL/6 mice, with an extensive pre-existing collateral circulation, we also opted for concomitant ligation of the femoral vein to increase ischemia severity (Hellingman, 2010 1649). One of the reasons to choose C57BL/6 mice, which is a largely congenital strain that holds nominal heterogeneity genetic amid animals was the quest of avoiding variability amid mice as it would guarantee reproducible and reliable experiments with the use of similar strains (Bentzon, 2010 1658). When equated to the rest of mice strains. Such as BALB/c and A/J it holds a more comprehensive recovery of perfusion of limb post-ischemia induction and an increased capacity for collateral arteries recruitment (Helisch, 2006 1659) and (Scholz, 2002 1660). Thus this results in the avoidance of hind-limb necrosis thus permitting long-run mice analysis.

            Despite the clinical significance, held by HLIM has clinical value its limitatoons cannot be ignored when equated to CLI our HLIM is acute in nature. Despite the fact that a three-year-old mouse is similar to 80 years human it is more suitable for efficiency to utilize older mice in modeling CLI.  In this context, we utilized 26 weeks old female mice under the C57BL/6 category (Austad, 2009 1662). The husbandry costs that are associated with the use of older mouse results in higher experimental expenses. This is given that older mice are characterized by slower recovery levels after the conduction of femoral artery ligation when equated with younger mice and are lower expected to comprehensively recover without the provision of any therapeutic engagement. Young adult mice which are about three months old holds a 50 percent better functional recovery state when compared with the aged ones which are 18 months 2 weeks after HLI induction (Westvik, 2009 1665). Arteriogenesis seems to be diminished in an ischemic hindlimb for older mice thus revascularization occurs principally via angiogenesis which is less efficient in the current model. An additional limitation of the utilization of younger mice it that they are usually the wild kind and lacks any of the necessary co-morbidities that are commonly observed in CLI patients like hypertension, DM and hypercholesterolemia all linked to slow recovery from ischemia that associates with lower densities capillary.

Interestingly, in patients with PAD, preeminent VEGF plasma was decreased to the normal standard on revascularization. (Makin, 2003 367) and (Pourageaud, 1998 368) Suggested that angiogenesis is enthused during Ischemia of the Limb. An often consequence of these health conditions is inflammation induction as well as stress oxidative resulting in endothelia dysfunction as well as impaired arteriogenesis partially via a reduction both in mediated dilation flow and exterior vascular restructuring (Ziegler, 2010 1666).

Nevertheless, with our murine HLIM, we showed that LDIR provides a kinetic advantage, synergizing with HLI and inducing faster recovery from ischemia with significant improvements in perfusion, capillary, and collateral densities, tilting the angiogenic balance towards an, even more, pro-angiogenic phenotype. In contrast, no effects of LDIR were documented in the resting vasculature, not subjected to ischemia. All the concerns involving inflammation and endothelial dysfunction after ischemia and LDIR were also addressed during our research work .In our mouse HLIM, the acute ischemic stimulus per se, created by the femoral ligation and excision, and triggers a regeneration response by itself (Couffinhal, 1998 928). Mice were expected to regenerate when subjected to ischemia, improving their hind limb perfusion after an abrupt interruption of blood flow supply, namely through capillary and collateral vessels growth.   

Laser Doppler Perfusion Imaging (LDPI) is often utilized in the biomedical study for the evaluation as well as monitoring of mouse microcirculation HLIM for researching in reference to PAD. This was or option for LDIR effectiveness evaluation as the pro-angiogenic intervention in regard to HLI.  This approaches results in minimized pain as well as distress to mice, lowers the animals number that is necessitated in protocols regarding biomedical and permits non-terminal, chronic assessment of superficial physiological mice perfusion.

Subsequently, surgical initiation of autonomous HLI, twenty six weeks old female C57BL/6 rats were fake- exposed or exposed with four diurnal fractions of 0.3 Gy, in uninterrupted days and permitted to recuperate. Femoral artery unilateral excision permitted the Contralateral Limb to be utilized as the comparator for control despite the changes in recruitment or gait of the spinal reflexes mean that the muscle contralateral is not equal to the unprocessed controls (Egginton, 1999 1667)and (Hudlicka, 2003 1668).

Serial perfusion measurements, ensuring similar environmental conditions and mice activity status, were performed before ischemia, immediately after ischemia at day 7, 15 and 45 post-ischemia induction. A drastic blood flow reduction was observed in ischemic limb directly after the surgical procedure when equated to contralateral limb and as per the anticipation, a gradual perfusion improvement was observed over time passage. Strikingly, a significant improvement in blood flow recovery was seen in the LDIR group, 15 days post-HLI that persisted at 45 days post-HLI, compared with control mice. This demonstrates a benefit of LDIR in perfusion recovery, in the setting of HLI (P<0.001). Even though the advances in radiobiology during the past two decades challenge the validity of the LNT theory suggesting that it overestimates radiation risks (Tubiana, 2009 932), or the more recent hormesis hypothesis, the next step in our work, keeping in mind translation to human medicine, was to determine the lowest dose of IR able to induce perfusion recovery.

The utilization of the same exemplary mice were exposed with: (i) inferior number of portions (1* 0.3 GY; 2 x 0.3 GY; or 3 x 0.3 GY); (ii) inferior dose per portion (4 x 0.1 GY); or (iii) higher quantity of portions (7 x 0.3 GY) following ischemia initiation. Non- exposed (NIR) mice were used as a control. No noteworthy enhancements were perceived in muscles exposed with a subordinate number of portions (1 * 0.3 Gy; 2 x 0.3 Gy; or 3 x 0.3 Gy) or with lower dose for each portion (4 x 0.1 GY) when equated to sham-exposed muscles. However, we found that blood perfusion recovery was significantly increased at days 15 and 45 post-ischemia in the ischemic limb of irradiated mice with a higher number of fractions (7 x 0.3 GY), when compared to sham-irradiated mice. Therefore, our results suggest that temporal dynamics for blood flow recovery; angiogenesis or arteriogenesis may be modulated by different doses of IR. These observations accord with previous findings that different doses of IR may conduct to different biological effects since they may differently modulate intracellular signaling (Sofia Vala, 2010 938).

Calling upon the same HLIM, histological and molecular analysis of tissue samples was the next step of our research. Although this evaluation required the sacrifice of the animal’s assessment of capillary density in the gastrocnemius muscle was implemented at several time points. Nevertheless, results are shown at the 15-day post-ischemia and importantly at day 45-post ischemia, after histological complete muscle regeneration. Capillary capacity, for instance, the number of capillaries that exists for every fiber muscle was thus quantified by the staining muscle parts for the endothelial marker in the two differentiated section of four different anatomic sections of every specimen. As expected, HLI per se is associated with a non-significant higher capillary density. However, when comparing irradiated and non-irradiated ischemic gastrocnemius muscles at day 45-post ischemia, there was a significant increase in capillary density (P<0.001) again suggesting a synergy between LDIR and HLI.

According to, Springer, (2000 940) Collateral development denotes the extensive development of the pre-existing vessels and thus it becomes of the highest significance in the recovery of ischemic tissues. Thus, exposing the mice to LDIR (0.3 Gy) or sham-irradiation, during 4 consecutive days after ischemia induction, we were aiming to evaluate if mice would regenerate with higher collateral vessel density (CVD). Through the injection of a contrast agent and the use of the diaphonization technique, we were able to visualize in detail the arterial branching and quantify the CVD. Diaphonization is an ancient preparation anatomical technique that is utilized in making the specimen more transparent with the capability of revealing the three-dimensional arterial distribution of those specimens that have been preserved. In the last century it has been utilized mainly in the study of vascularization in reference to a number of structures and organs (Tilotta, 2009 943), (Bourdelat, 1989 944) and (Alberti, 1989 945). This technique is based on principles of optical physics and involves sequential chemical processing to replace all interstitial fluid by a specific solution, giving a homogeneous density to all tissues. Therefore, through an optimization of optical physical properties, light is transmitted through the thickness of the mouse limb without being reflected neither absorbed, giving it transparency.

Through the injection of an opaque contrast agent before this technique, we are able to perfectly recognize the vascular tree and to quantify the collateral vessels. The region of interest (ROI) was selected in every mouse in equivalent anatomic regions, surrounding the ligation site at the thigh and equivalent to 20% of the overall limb part. These regions represent the best location to measure collateral vessel growth in response to ischemia since it was reported that arteriogenesis occurs primarily around the occluded vessel segment (Zhuang, 2006 948). In the present work, we have shown that at 15 days and at 90 days post-ischemia LDIR promotes collateral vessels growth in the adductor muscles of the thigh (P<0.001) when comparing ischemic irradiated muscles to sham irradiated ones. After establishing that LDIR acts synergistically with HLI inducing a faster recovery from ischemia the next step in our research was to determine the mechanism(s) responsible for this kinetic cooperation.

In order to evaluate the expression of angiogenic genes, using laser microdissection microscope CD31 positive cells were isolated from ischemic, low-dose irradiated and sham-irradiated gastrocnemius muscles. First, assessing the expression levels of endothelial-specific transcripts (platelet and endothelial cell adhesion molecule 1 (Pecam1) encoding CD31, the ETS-related gene (Erg) and ETS variant 2 (Etv2) we confirmed that these CD 31 positive cells were primarily ECs with negligible amounts of myeloid or perivascular cells. According to our in vitro results, several proangiogenic targets (VEGFR1, VEGFR2, FGF2, TGFβ, ANGPT2, PDGFC, HGF and c-MET) were shown overexpressed exclusively in the ischemic irradiated gastrocnemius muscles when compared to the sham-irradiated controls. These findings imply a link for the long-term advantage of irradiated ECs in blood perfusion, capillary density, and collaterals in HLI. LDIR induced a sustained and prolonged pro-angiogenic response in ECs, still evident 45 days after irradiation. Because this contrasts with the transient in vitro response, one may hypothesize either that endothelium itself could be differently modulated by LDIR in a hypoxic microenvironment created by ischemia, or that some cells (e.g. adipocytes) could contribute to perpetuating the effect(s) of irradiation in ways that in vitro cultures cannot mimic. Importantly, no effect was observed in the adductor muscles capillary density or gene expression profile neither in response to ischemia per se, or after LDIR exposure.

Moreover, we showed that the increase in capillary density and the upregulation in relative gene expression found in irradiated gastrocnemius muscle is abrogated or inhibited by treatment with PTK/ZK, a VEGFR2 tyrosine kinase inhibitor. PTK/ZK has no effect on the increase of gastrocnemius capillary density modulated exclusively by HLI. This is in accordance with the fact that blockage of VEGFR2 activation prevents the IR-mediated angiogenic response, as previously reported (Shalaby, 1997 1644). Conversely, the collateral vessel density induced after LDIR exposure was not affected by PTK/ZK. These results suggest that LDIR induces capillary density and pro-angiogenic gene expression in a mechanism dependent of VEGFR2 activation, but this same mechanism do not explain arteriogenesis. EPCs capability to ischemic injuries repair necessitates them to be mobilized initially from BM in the quest of migrating into the Ischemic region where EPCs can thus differentiate into ECs nature. According to our results, LDIR appear to act again synergistically with HLI promoting an earlier and greater increase in the number of serum EPCs identified by flow cytometry as VEGFR2/Sca1/CD117 positive mononuclear cells.

Several cytokines were reported as being involved in the guidance of EPCs to ischemic tissue (Luttun, 2002 1604), (Sennikov, 2002 2042) and (Asahara, 1999 2043). Our previous lab results showed that in hypoxic mimicking conditions LDIR increase ECs VEGF expression (Sofia Vala, 2010 938). In this work we also showed, not only in vitro but also in vivo, that Pgf and Csf3 expression is up regulated in ECs and a significant increase in plasma levels of VEGF, PIGF and G-CSF was observed at day 4 after 4 x 0.3 Gy LDIR exposures. The up regulation of these cytokines, not only VEGF, might explain why PB EPCs levels are not modulated by PTK/ZK inhibition. Our results showed that PB levels of SDF1 (an important cytokine for EPC mobilisation) are not modulated by LDIR (0.3 Gy), contrary to the work of Lerman et al (Lerman, 2010 2056)which showed that a single dose of 5 Gy IR up-regulates SDF-1 through both HIF-1-dependent and independent pathways. Again our results suggest that the effects of IR are dose-dependent.

In order to evaluate the functional relevance of these LDIR-induced circulating EPCs we used a transplantation model, in which all hematopoietic cells were GFP+ (including circulating and extravasated/tissue, leucocytes, erythrocytes, and platelets), but EPCs, forming the inner lining of blood vessels, exhibited both green (GFP+) and red (CD31+). A quantitative evaluation of the histological sections revealed a significant increased number of GFP+/CD31+ cells per area into irradiated thigh muscles when compared to the non-irradiated ones. LDIR per se do not increase these growth factors concentrations and notably the irradiation of the ischemic tissue is critical for the mobilisation of EPCs and collateral formation. Although we cannot exclude that other cells could modulate the levels of these cytokines upon LDIR, our results strongly suggest the involvement of ECs.

The affiliation amongst IR and the resistant system is intricate and multifactorial and is habituated by the prescription and superiority of the emission as well as the sort of cell premeditated. The impacts of the utilization of low doses for the vasculature is that they cannot be extrapolated and are non-linear when equated to higher doses. Irradiation of high doses involves both harmful and protective impacts but doses that are particularly low (0.025 up to 0.05 GY) provided at the reduced dose rate were demonstrated as protective (Mitchel, 2011 2060). According Rodel, (2002 215) DNA lesions induced by IR may be not that severe as to allow greater efficiency of DNA repair mechanisms and epigenetic pathways such as DNA methylation (Aarts, 2011 1908) and the differential expression of several types of proteins may explain the different biological effects of IR (Rodel, 2012 217). In general doses higher than 2 Gy produce pro-inflammatory effects (Williams, 2003 205). On the other hand, doses lower than 1 Gy are responsible for the modulation of several inflammatory processes resulting in unequivocal anti-inflammatory properties. (Rodel, 2007 206)The usefulness of radiation therapy, based on the anti-inflammatory properties of IR, has been long known. Therapeutic applicability was demonstrated on the inflammatory disease as symptomatic improvement of rheumatoid arthritis was observed when mice were irradiated with 0.5 Gy in five fractions within one week (Frey, 2009 2044). Accordingly symptomatic improvement was additionally shown in a mice model or arthritis that had been induced with irradiation doses of a single Gy with 5 fractions and 0.5 Gy with 5 fractions, in a mechanism dependent on reduced Inducible Nitric Oxide Synthase (iNOS) activity and increased heme oxygenase  (HO-1) levels (Hildebrandt, 2003 2058).

Hematopoietic infiltrate in the study’s HLIM was supervised from reddened and ischemic tissues to evaluate the probable responsibility of resistant cells upon LDIR. Ischemia per se induced about a 20 times to increase in the immune CD45+ cell infiltrate recruited to the injured muscle. Exposure with LDIR significantly inhibited the CD45+ cell accumulation with particular effects on monocytes, macrophages, and neutrophils. When 2.0 Gy were administered during 4 consecutive days the total CD45+ accumulation in ischemic muscle was still reduced as compared to sham-irradiated mice, although numbers of monocytes and macrophages were restored, not neutrophils. This is consistent with the fact that high irradiation doses have opposing effects on certain myeloid subsets, for they activate macrophages (Klug, 2013 2050) while they are reported to induce rapid, but transient, neutropenia (Romero-Weaver, 2013 2051).

            Importantly, the effect of irradiation was short-listed. Fifteen days post-HLI the profiles of myeloid cells that infiltrated non-irradiated and irradiated ischemic muscles were similar. Altogether these data pointed for a mechanism of LDIR-induced angiogenesis independent of local myeloid cell recruitment and suggest like previously mentioned, that LDIR may even have anti-inflammatory proprieties. One important concern when addressing IR is its toxic effect. According to the currently challenged LNT hypothesis, the dose-response is linear and no threshold exists where damage begins to show. Higher doses of IR (2 to 10 Gy) have been used to induce revascularization in several studies (Heissig, 2005 933), (Thanik, 2010 934) and (Zhou, 2009 936) and in fact radiation therapy still continues to be an accepted treatment for benign diseases (Jha, 2008 937). However, there is no consensus about the doses described as pro-angiogenic, as different radiation sources are used. The use of conventional radiotherapy dose (2-10 Gy, administered once, Caesium-137 source) has been shown to induce neovascularization in HLI via the release of VEGF from the mast cells as well MMP-9 progenitor mediated mobilization cells. However, some probably advanced implications were referred (Heissig, 2005 933). To the best of our knowledge, to date, the use of those high doses has not been proposed for therapeutic angiogenesis.

Here, IR was delivered through a linear accelerator producing x-rays photon beam, currently used in the clinical practice. In order to assess the long-term toxicity of LDIR, we used the same HLI model and LDIR regimen described previously. No difference was seen in weight gain (at weeks 24, 36, 48 and 52 post-HLI) between control (sham-irradiated) and LDIR animals. At week 52 post-HLI mice were sacrificed and morphological, biochemical and histological parameters recorded. No morbidity or mortality was observed. Urinalysis and blood count, serum biochemistry and coagulation tests results were within normal range for the C57BL/6 mouse strain, for both groups. Bone marrow smear and histological sections of skin, lung, spleen, muscle, bone marrow and lymph nodes were analyzed and the few lesions identified were common to all experimental groups, mostly related to aging and the strain of the mice used (Haines, 2001 2052), and not associated with LDIR. Thus far, and although the possibility of LDIR long-term toxicity cannot be completely ruled out, as genomic instability and non-targeted bystander effects are delayed effects of IR, no LDIR-associated toxicological effects were observed. Furthermore, the beneficial effects of a therapy in a disease with limited life expectancy, as CLI, can overcome its putative negligible or minor toxic effect.

In other words, using a model of experimentally induced HLI, mice were exposed to LDIR and limb perfusion, capillary density and collateral vessel formation were measured. We show that LDIR (4 x 0.3 Gy) improve limb perfusion by enhancing arteriogenesis through EPCs recruitment to sites of collateral vessel development, an effect dependent on exposure of the ischemic niche to LDIR, but not on the local recruitment of myeloid cells. Likewise, LDIR also favors angiogenesis through simultaneous activation of a repertoire of pro-angiogenic factors in mature ECs in a mechanism dependent on VEGFR signaling, with no short-term side effects and no effects on resting vasculature, opening a possibility to new therapeutic strategies in lower limb vascular insufficiency.

CELL THERAPY

Vasculogenesis incorporates the recruitment of Progenitor cells towards the ischemic region as well as their differentiation in the fresh blood vessels. The most suitable cell for the cellular therapy in regard to CLI which has retained its controversy till today. Most of the potential cells candidates have thus been assessed as neovascularization promoters with the inclusion of BM cells, Hematopoietic stemming cells, BM-MNCs, EPCs, MSCs, and Hemangiocytes. MSCS can be regarded as multi- powerful non-hematopoietic cells like fibroblast that can be excluded from the differing tissues which incorporate BM, placenta, adipose tissue and blood in the umbilical cord.  Normally therapeutic vascular effects are exerted by MSCs through paracrine factors secretion that might incorporate anti-inflammatory as we as immunomodulatory implications. Immune-modulation is a unique feature for MSCs, making their combination with other stem cells subtypes very appealing to enhance allogeneic injection for inducing repair.

Studies have demonstrated that cells acquired from adult patients with numerous risk forces hold compromised functions. Based on this rationale, therapeutic efficiency for CLI patients can be raised by the use of MSCs acquired from younger donors overcoming age and vascular disease–mediated deficiencies in EPCs number, function, and angiogenic cytokine production. Amongst the probable MSCs sources, there lies the umbilical cord tissue. Stem Mesenchymal Cells acquired from the umbilical cord Tissues (UC-MSCs) hold equated surface phenotype, multipotency, and plastic adherence similar to MSCs derived from different sources. Compared with the differing parts from other regions, UC-MSCs have acquired undoubtedly benefits:

  1. To begin with, they are associated with a non-aggressive gathering procedure for allogenic or autologous use which is acceptable ethically.
  2. Hold a reduced infection risk
  3. Reduced teratoma risk
  4. Easy to acquire a number that is considered for UC-MSCs post a number of passages and excessive Ex-vivo rise.
  5. Rapid self-renewal when equated to BM-MSCs
  6. Hold low immunogenicity that has the desirable immunosuppressive capability (Nagamura-Inoue, 2014 2040).

ECBio, one of the leading biotechnology corporations, has created a proprietary advancement to constantly isolate, increase and cryopreserve a population that is suitably organized into the human cells stem acquired from tissues within the umbilical cord by the term Wharton that has been titled UCX® cells (Santos, 2013 1955). The utilized technology for UCX® segregation differs from all other UC-MSCs segregation methodologies. In short, the intuition of the three prime stage approach for the recovery of cells was intuited in the quest of making the approach completely reliable.  Second, the segregation starts with amniotic membrane peeling off with a reduction of microbial contamination frequency thus augmenting the accuracy of UCX® resulting populace by the general epithelial progenitors’ elimination. Third, tissues incisions or the crushing criteria is avoided given that it would hinder its use in proper manufacturing operations setting. In addition, it is likely to jeopardize phenotype stem cell based on the presence of extreme technical manipulation. Furthermore, the utilization of optimized ration amid mass tissues, general solution capacity, enzymes operative units digestion and empty capacity UCX® particular cells release thus inducing vessels cord that will, in turn, lower the endothelial contamination and cells sub-endothelia from umbilical vein and arteries (Santos, 2013 1955).

UCX® cells can be termed as a populace that is standardized belonging to stem cells that adhere to the existing  MSCs description as recognized mainly by the (ISCT)- International Society for Cellular Therapy (Santos, 2013 1955) and (Gartner, 2014 2033). Notably, it was demonstrated that UCX® cells might turn to an effective and guaranteed fresh approach for the treatment of both systematic as well as local inflammatory arthritis manifestations.  Based on the observations UCX® cells hold the density to inhibiting the human T- cell concomitantly and proliferation thus promoting Tregs expansion efficiency higher than that of BM-MSCs. In accordance, UCX® cells xenogeneic administration in both chronics induced adjuvant and acute induced-carrageenan arthritis models for inflammation arthritis can lower Edema Paw in vivo with increased efficiency as compared to BM-MSCs and demonstrated higher systematic as well as local remission arthritic manifestation. It is authoritatively stated by this information that UCX® cells exist as immunosuppressive and additionally hold lower immunogenicity that is appropriate (Santos, 2013 1955).

Furthermore, it was demonstrated that UCX® cells conserves cardiac functioning and offset adversative remodeling muscle post intramyocardial replacement in the myocardial murine infarction approach. The protective- cardio UCX® effects are exerted via a paracrine approach that appears in the quest of angiogenesis enhancement. In this case, it was demonstrated that UCX® cells raise the capillary volume in regard to myocardium infarcted given that CD31 expressive cells proved to be highly abundant within the UCX® cells transplanted heart wall when equated to hearts injected vehicle. UCX® cells proved to be responsible in quickening wound remedial. The studies suggest strongly that UCX® cells normally act in differentiated cells kinds via paracrine models. Furthermore, the results showed that UCX® Vitro conditioned medium triggers angiogenesis through promoting capillary-like formations by HUVECs (Santos, 2013 1955).

It was recognized that UCX®, when assimilated with HUVECs, arouses tubule HUVECs establishment to the uppermost degree as it is known to be FGF2 pro-angiogenic which is further involved in movement elevation. As demonstrated earlier, for the earlier cells kinds, our findings suggest that UCX® normally serves in ECs via paracrine machinery because a critical rise for the pro-angiogenic forces like PDGFAA, HGF and IL8 were established in the medium UCX® condition while being equated to that of control. In accordance, the findings have substantiated the findings demonstrating that UCX® ECS, and tubulogenesis migration.

In the quest of investigating whether UCX® was capable of therapeutic angiogenesis promotion in the context of HLI, the study utilized once more the26 week’s old female mice. Post the surgical unilateral HLI induction two differentiated UCX® were assessed: intramuscular in the gastrocnemius muscle, 5 hours post-ischemia and retro-orbital (RO), 24 hours post-ischemia induction. The involved risk in rejection of immune in this study’s experimental set up was accounted as minimal given that UCX® had been xenon- entrenched prior into immunocompetent rabbits, sheep,  mice as well as rats without an elicitation of any compromising rejection of immune (Santos, 2013 1955) and (Santos Nascimento, 2014 1956).

Different works have shown that the delay between the onset of disease and the administration of MSCs could affect the therapeutic efficacy (Yan, 2013 2031). In contrast, using similar models, other trials show that MSCs are more effective when administered 24 hours after ischemia induction (Prather, 2009 2032). In our study, mice died after 5x106 UCX® administration via RO injection, the highest cell concentration causing lung embolization. A lower cell concentration (1x106) was tolerated, but UCX® were not visualized in the gastrocnemius muscle after 2, 7 or 15 days, as assessed by immunofluorescence microscopy. Intra-muscular injection has been the utmost frequently developed technique both in pre-medical and clinical studies even though the needle can cause tissue damage (Yan, 2013 2031). Therefore, 2x105 or 1x106 UCX® were injected via IM, 5 hours after ischemia. At day 7 post-ischemia induction, UCX® were present in the gastrocnemius muscle as assessed by immunofluorescence microscopy, but the concentration of cells was decreased when compared to day 2. Moreover, at day 15, UCX® was no longer detected. We may hypothesize that following UCX® administration, cells survive a few days due to their already described low immunogenicity and then die.

Human MSCs has been labeled as niche and home to inflammatory locations retaining their viability in Xeno-relocated rat for about two weeks in standard rats/ mice and thus raising their inflammation sites permanence in diseased approaches without noticeable coming to the differing organs (Gartner, 2014 2033). In another study, it was shown that when 1x106 placental human MSCs expressing luciferase were additionally intuited and it was demonstrated by the bio-pattern distribution that the capability of cells persistence only occurred at the site of injection and was not distribute to the differentiated organs. Additionally, placental MSCs for humans sustained constant high luciferase levels expressive cells for approximately three weeks (Gartner, 2014 2033). In order to follow UCX® cells over time, biodistribution analysis was performed; however, we show that the number of administered luciferase-expressing cells (2x105 cells) is not enough to allow their detection by IVIS Lumina, even immediately after IM injection. For that reason, it was not possible to follow up the UCX® residence in the gastrocnemius muscle over time. Moreover, we cannot assure that UCX® does not migrate to other surrounding organs/tissues or enter into the bloodstream. For that motive, another technical approach was used in the mandate to scrutinize the supposed presence of UCX® not only in the gastrocnemius muscle but also in other organs such as lung, spleen, liver, and kidney. Accordingly, these organs were isolated from ischemic mice sacrificed at days 3 and 28 post- UCX® injection and RT-PCR will be performed using a human gene target. According to our results from immunofluorescence, UCX® should be detected in the gastrocnemius muscle at day 2. Given the high sensitivity of the RT-PCR method, it would be important to know if UCX® remains at the gastrocnemius muscle (injection site) at day 28. Simultaneously, and using the same approach, we expect to evaluate the capacity of UCX® to migrate to and proliferate in other organs.

With the objective of assuring the safety of UCX® cells, another route of UCX® administration was used in our biodistribution analysis. Therefore, after ischemia induction and UCX® intraperitoneal (IP) administration, cells were detected proximal to femoral artery excision site at day 0 or 1 post-UCX® injection. These results were in accordance with the literature. However, in one of these mice, a strong signal was also detected, at days 0 and 1, in the abdominal area (Sensebe, 2013 2035). We may hypothesize that this particular mouse had an inflammation/injury at the abdominal area when ischemia was performed/ UCX® administered and for that reason, UCX® cells were driven to that area. It is also possible to hypothesize that UCX® had a secondary homing; however, no signal was detected in the lung. This specific mouse was sacrificed at day 1 post-UCX® injection in order to analyze if the abdominal area presented any inflammation and/or injury and track the cells by RT- PCR. The other two mice of the same experimental condition were followed over time and they were sacrificed at days 7 and 15 post-ischemia, when both presented an absence of bioluminescence signal, in order to track UCX® by RT-PCR in the principal organs (ex: gastrocnemius muscle, lung, spleen, liver, kidney). A similar experiment was performed using non-ischemic mice. In this experimental condition, UCX® were not detected by bioluminescence analysis after IP injection at any time point. With the same objective, mice were sacrificed at days 7 and 15 in order to track UCX® by RT-PCR in the principal organs.

After establishing the safety of IM injections as the best administration route and the 2x105 the best dose, the next step in our work was to assess if UCX® promotes angiogenesis and arteriogenesis in this mouse model of HLI. Accordingly, perfusion recovery was evaluated over time, capillary density was measured in the gastrocnemius muscle and collateral density was measured in the adductor muscle. Our results showed an increment in perfusion recovery in mice treated with 2x105 UCX® as assessed by laser Doppler at 14, 19 and 24 days post-ischemia when compared to untreated ones. Moreover, an increase in capillary density and collateral vessel density (CVD) was noted in mice treated with 2x105 UCX®.

            These assessments were conducted mainly on the 90th day after HLI creating the suggestions that the implication that was persuaded by UCX® in both arteriogenesis and angiogenesis is sustained over a time period. Together with, the on-ischemic forces are not impacted by UCX® gave that capillary capacity as well as CVD is equivalent to the muscles that are on-ischemic both derived from control mice as well as UCX® treated ones creating the indication that UCX® might generate a resident action. The data thus suggest that UCX® holds the capability of secreting cytokines and practically alter ischemic mice surrounding thus contributing towards therapeutic angiogenesis.

            Moreover, in this work, the in vivo angiogenic potential of UCX® obtained from two different umbilical cord tissues was compared. The cells, isolated from two different umbilical cords, presented differently in vitro angiogenic potential according to ECBio’s results (secretome analysis and matrigel tube formation assays). According to our in vivo results, at days 14 and 21 post-ischemia we found that mice treated with either UCX® present similar levels of blood flow, both significantly higher when compared to untreated mice (p˂0.01). However, at day 7 post-ischemia, the perfusion recovery was significantly increased only in mice treated with UCX® presenting the best angiogenic potential in vitro. Our results suggest that UCX®, isolated from the tissues of different umbilical cords and presenting differently in vitro angiogenic potential could induce perfusion recovery after HLI with different temporal dynamics. It will certainly be important: 

  1. To establish through analysis if those UCX® have the same potential in inducing capillary and collateral densities
  2. To gather knowledge about the molecular and cellular mechanisms by which those UCX® induce perfusion recovery and consequently capillary and/or collateral densities. According to the secretome analysis (performed by ECBio), those UCX® secrete the same cytokines/chemokines but their levels are different. We may hypothesize that those factors (including pro-angiogenic factors) being present in different levels will interfere differently with the microenvironment and modulate in a different way the intracellular signaling of different target cells. This could contribute to different biological responses and/or same biological responses at different levels. It is important to remember that the angiogenic switch has to occur to initiate angiogenesis and a dynamic balance between pro- and anti-angiogenic factors control this process.

            It should be noted that a fresh UCX® mechanical action is demonstrated for the initial time. UCX® moderates pro-angiogenic expression players within ECs. The study established that 70 days after UCX® and HLI treatment, ECs segregated from UCX® micro-surrounding treatment and presented an upward parameter in their expressive rate in regard to HGF, FGF2, Ang2, and TGβ2 after being segregated from the ischemic muscle gastrocnemius when equated to the contralateral ones. This implication is UCX® specific given that the contrary one is verified within the mice control. Based on these findings it can be established that UCX® concurrently regulates several antigenic ECs forces. As per the current mechanism, the hypothesis is then that UCX® advances angiogenic endogenous effectiveness in respect to ischemic framework.  Keeping in mind translation to human medicine, another very important topic of this investigation was to assess if cryopreservation and subsequent thawing, both in vitro and in vivo, did not impair phenotype, immunomodulatory and angiogenic potencies of this specific UC-MSC population. Even though a noteworthy effort has been expended in order to optimize the manufacturing process to guarantee that MSCs retain their safety and therapeutic proprieties the results remain controversial.

            Reports demonstrate that cryopreservation negatively affects the immunosuppressive properties of BM-MSCs in a reversible manner, and is associated with a heat-shock stress response initiated during the thawing process, triggering the instant blood-mediated inflammatory reaction, occasioning to quicker complement- arbitrated removal next to blood acquaintance (Moll, 2014 1964). Temporary repression of non-constitutively expressed genes during the stress response allows the cells to prioritize cell survival before recovering their functional properties (Francois, 2012 1963). MSCs administration has been demonstrated to having the capability to improving renal functionality in rodent replicas of chronic kidney sickness partially by the reduction of intrarenal suppression and inflammation-fibrosis. Nevertheless, similar claims have been reported concerning the administration of cryopreserved adipose tissue-derived MSCs (AT-MSCs) re-counting noteworthy opposing implications and no apparent clinically applicable enhancement in renal efficient limits. AT-MSCs administration refined from adipose cryopreserved was not linked to opposing implications but was not additionally linked to renal functionality limits improvement (Quimby, 2013 1966).

            However, the belief that cryopreservation negatively affects the performance of MSCs has recently been challenged. Lützkendorf et al. showed that xenon-free, GMP-grade BM-MSCs, cryopreservation had no impact on viability and consensus criteria of MSCs. In co-culture with PB-MNCs, MSCs showed low immunogenicity and suppressed mitogen-stimulated proliferation of PB-MNCs irrespective of cryopreservation. Cytogenetic aberrations were not observed consistently in fresh and cryopreserved products, and no signs of malignant transformation occurred in functional assays (Luetzkendorf, 2015 1967). More recently, Cruz et al. in vivo analysis verified the potent xenogeneic effects of human BM-MSCs in an immunocompetent mouse model of allergic airways inflammation and established that thawed MSCs are as effective as fresh MSCs (Cruz, 2015 1968). Most importantly, in phase II clinical study using BM-MSCs in acute graft-versus-host disease in which either cultured or freshly thawed cell was infused, there was no report of clinical differences observed between the two groups (Le Blanc, 2008 2075).

            The paradoxes between reports, some suggesting that freshly thawed previously cryopreserved MSCs may not have the same effectiveness or breadth of anti-inflammatory activities as do continuously cultured MSCs may be explained by differences in tissue source and manipulation during the manufacturing process, including the cryopreservation and thawing procedures (Barcia, 2015 1971). Previous studies used BM and AT-derived MSCs, conducted by Francois, (2012) and Quimby, (2013) whereas the present work reports to UC-MSCs. It was demonstrated by the findings that UCX® proved to possess low immunogenic and higher immunosuppression operation when equated to BM-MSCs. More, UCX® did not necessitate activation before or exert priming to their immune-modulatory implications.

            As mentioned before, Francois et al. (Francois, 2012 1963) in their work concluded that cryopreserved BM-MSC that are freshly liquefied acquired from standard human volunteers that regulated protein’s heat shock are headstrong to interferon. (IFN)-γ-prompted up-parameter of IDO, and cooperate in overwhelming CD3/CD28-single-minded T cell propagation. On the contrary, this works findings show that cryopreservation has no deleterious effect on the immune-modulatory potential of non-primed UC-MSCs, as seen in vitro by the proliferation suppression of PB-MNCs activated by Non-CD3, Non-CD28 as well as IL-2, and also no differences were documented in the expression of some functional markers CD200, CD274, CD273 and CD146 by cryopreservation as a whole. Although the immune functionality testing in vitro of UCX® cells, as performed in this study, was only partial, and the impact on cell biochemical responsiveness to inflammatory cues such as interferon-γ, tumor necrosis factor-α, IL-1 or toll-like receptor agonists were not evaluated, our results support the thesis that UC-MSC immunosuppression activity is independent of priming mechanisms (Santos Nascimento, 2014 1956) and (Miranda, 2015 1957) and that it is not affected by cryopreservation.

            Having established that freshly thawed UCX® maintained their functional markers and their ability to suppress activated T cells, we further tested whether freshly thawed UCX® cells showed impaired immune-modulatory therapeutic benefits in vivo. For this purpose, a prolonged adjuvant -induced arthritis (AIA) rat ideal was utilized over the course of 64 days. The results showed that there was no significant difference between treatments performed with either cultured or freshly thawed cell for any readout measured. In this study, we obtained no evidence of increased apoptosis or changes in surface markers in the freshly thawed population compared with the cultured population, and although clearance and engraftment were not directly compared in vivo, the two conditions showed no differences in therapeutic activity/potency in vivo.

            Regarding angiogenic potential, the previous results were obtained using UCX® cultured during five days before the administration in ischemic mice. In addition, in this work we also compared the effect obtained in perfusion recovery of UCX® in these conditions with: i) UCX® administered immediately after thawing and ii) UCX® administered after 24 hours in culture. Our results suggest that at days 14 and 21 post-ischemia no significant differences were obtained between them. The three different experimental conditions present similar levels of blood flow that are significantly different when compared to the levels of untreated mice. However, at day 7 post-ischemia, UCX® administered after 24 hours in culture did not show significant differences when compared to untreated mice, in contrast to UCX® cultured during five days before the administration or UCX® administered immediately after thawing. In order to explain these results, we may hypothesize that UCX® thawed and placed in culture during 24 hours are not yet adapted to in vitro culture conditions and are not proliferating in contrast to UCX® cultured during 5 days before administration. Therefore, according to the in vitro culture condition, UCX® may present different molecular expression patterns that will differently influence the ischemic microenvironment contributing to a different response in the first few days after administration. After that period of adaptation to an in vivo microenvironment UCX®, that survive could conduct similar biological responses. Concerning the condition where UCX® were administered immediately after thawing, it is possible that the present results are a consequence of the fact that the cells did not have to pass through the adaptation to different conditions in a short time span. This indicates that UCX® cells do not require a recovery period and may be infused immediately after thawing.

            Besides cell source, process-related factors that might have contributed to this outcome concern the drastic reduction of tissue mechanical manipulation of ECBio specific isolation process, also, ECBio process development involved a thorough optimization of the tissue preparation process and digestion parameters that resulted in a neglectful contamination of epithelial, endothelial and sub-endothelial cells, thus promoting the phenotypic homogeneity of the final population.

            Conclusion and Future Perspectives

            In summing up, the preclinical, as well as the clinical tests on cell and gene therapy in referent to the two recent decades, created a principle roof in that angiogenesis therapy can be described as an alternative treatment for patients with no option suffering primarily from the vascular disorder that incorporates CLI. However, the acquired efficiency that is remarkable in reference to angiogenic therapy that was observed in preclinical models, has not yet been translated into clinical trials. Although scientific research has added various weapons to the therapeutic armamentarium in the battle against the cardiovascular ischemic disease, it has also raised a number of issues yet to be solved: optimal gene or cell delivery methods, timing and dosing regimens; and effective cell populations, as well as, isolation and processing methods.

            Low dose ionizing radiation may hopefully become a new tool in regenerative medicine, since they activate, simultaneously, several pro-angiogenic factors and also increase EPCs mobilization improving their function, proliferation and survival features, positioning themselves as an adjuvant therapy that allows overcoming endogenous impairments in EPCs health and vascular responsiveness. These mechanisms could be extremely relevant given the complex and fine-tuned process that represents the formation of a functional vessel network, requiring the constant interplay of several angiogenic factors.

            The mechanisms described in our research allow us to overcome some of the most pressing limitations currently pointed to therapeutic angiogenesis and also to think of LDIR as a way of improving microcirculation in association with macrovascular revascularization. Regarding cell therapy, our research showed that UCX® may be perceived as a suitable therapeutic methodology for CLI. In a significant context, UCX®   induces perfusion of blood, capillary volume and the development of collateral. This would partially be achieved via the development of fresh mechanisms because it was demonstrated that UCX® moderates concurrently the expressive nature of a number of pro-angiogenic forces in ECs that would enhance their angiogenic effectiveness. Again this can be applied when being equated to additional approaches where just one angiogenic force is administered, particularly if angiogenesis is understood as a complex procedure that incorporates a number of cytokines. Concerning the manufacturing procedure, in addition to dispensing the need to histo-compact tissues matching which can be less expensive probably and more convenient considerately more than AT-MSCs and BM.

            Future Perspectives

            This study’s results show that UCX® maintains strong immune-modulatory capacity and angiogenic potential, regardless of cryopreservation, do not require priming or a recovery period after thawing validating them as a viable base technology for the production of allogeneic, off-the-shelf, cryopreserved MSC-based advanced therapy medicinal products (ATMPs) with great therapeutic potential. As a future perspective, since the prevalence of DM is increasing, and since DM is one of the main risk factors for CLI, it would be very important to evaluate the efficacy of LDIR and UCX® in a diabetic mouse HILM as endothelial dysfunction is a main feature of DM. Regarding UCX® and the possibility of EPCs modulation, it would be also very significant, in the field of PAD, to identify which molecules could be used as an adjunctive therapy to improve UCX® angiogenic potency and to understand if UCX® administered with own patients impaired EPCs could act synergistically with them improving their function. In the future, using our mouse HLIM we intend to demonstrate that irradiation of UCX® using LDIR will allow them to acquire a more distinct pro-angiogenic phenotype, improving their effectiveness and efficiency as cellular therapy in the CLI. Finally, the success of our clinical trial will give us more impute regarding LDIR and CLI as an important clinical discovery worldwide, with major impact in contemporary clinical practice.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References

Aarts, M. & te Riele, H. Progress and prospects: oligonucleotide-directed gene modification in mouse embryonic stem cells: a route to therapeutic application. Gene Ther 18, 213-219 (2011).

Abdollahi, A., et al. Inhibition of alpha (v) beta3 integrin survival signaling enhances antiangiogenic and antitumor effects of radiotherapy. Clin Cancer Res 11, 6270-6279 (2005).

Abdollahi, A., et al. SU5416 and SU6668 attenuate the angiogenic effects of radiation-induced tumor cell growth factor production and amplify the direct anti-endothelial action of radiation in vitro. Cancer Res 63, 3755-3763 (2003).

Abumiya, T., et al. Activated microvessels express vascular endothelial growth factor and integrin alpha (v) beta3 during focal cerebral ischemia. J Cereb Blood Flow Metab 19, 1038-1050 (1999).

Adam, D.J., et al. Bypass versus angioplasty in severe ischaemia of the leg (BASIL): multicentre, randomised controlled trial. Lancet 366, 1925-1934 (2005).

Adams, R.H. & Alitalo, K. Molecular regulation of angiogenesis and lymphangiogenesis. Nat Rev Mol Cell Biol 8, 464-478 (2007).

Albers, M., Fratezi, A.C. & De Luccia, N. Assessment of quality of life of patients with severe ischemia as a result of infrainguinal arterial occlusive disease. J Vasc Surg 16, 54-59 (1992).

Alon, T., et al. Vascular endothelial growth factor acts as a survival factor for newly formed retinal vessels and has implications for retinopathy of prematurity. Nat Med 1, 1024-1028 (1995).

Amann, B., Luedemann, C., Ratei, R. & Schmidt-Lucke, J.A. Autologous bone marrow cell transplantation increases leg perfusion and reduces amputations in patients with advanced critical limb ischemia due to peripheral artery disease. Cell Transplant 18, 371-380 (2009).

Andrae, J., Gallini, R. & Betsholtz, C. Role of platelet-derived growth factors in physiology and medicine. Genes Dev 22, 1276-1312 (2008).

Angers, S. & Moon, R.T. Proximal events in Wnt signal transduction. Nat Rev Mol Cell Biol 10, 468-477 (2009).

Aquino, R., et al. Natural history of claudication: long-term serial follow-up study of 1244 claudicants. J Vasc Surg 34, 962-970 (2001).

Arain, S.A. & White, C.J. Endovascular therapy for critical limb ischemia. Vasc Med 13, 267-279 (2008).

Arima, S., et al. Angiogenic morphogenesis driven by dynamic and heterogeneous collective endothelial cell movement. Development 138, 4763-4776 (2011).

Asahara, T., et al. Isolation of putative progenitor endothelial cells for angiogenesis. Science 275, 964-967 (1997).

Attanasio, S. & Snell, J. Therapeutic angiogenesis in the management of critical limb ischemia: current concepts and review. Cardiol Rev 17, 115-120 (2009).

Augustin, H.G., Koh, G.Y., Thurston, G. & Alitalo, K. Control of vascular morphogenesis and homeostasis through the angiopoietin-Tie system. Nat Rev Mol Cell Biol 10, 165-177 (2009).

Averbeck, D. Non-targeted effects as a paradigm breaking evidence. Mutat Res 687, 7-12 (2010).

Avraamides, C.J., Garmy-Susini, B. & Varner, J.A. Integrins in angiogenesis and lymphangiogenesis. Nat Rev Cancer 8, 604-617 (2008).

Balaji, S., King, A., Crombleholme, T.M. & Keswani, S.G. The Role of Endothelial Progenitor Cells in Postnatal Vasculogenesis: Implications for Therapeutic Neovascularization and Wound Healing. Adv Wound Care (New Rochelle) 2, 283-295 (2013).

Barcellos-Hoff, M.H., Park, C. & Wright, E.G. Radiation and the microenvironment - tumorigenesis and therapy. Nat Rev Cancer 5, 867-875 (2005).

Bar-Sagi, D. & Feramisco, J.R. Induction of membrane ruffling and fluid-phase pinocytosis in quiescent fibroblasts by ras proteins. Science 233, 1061-1068 (1986).

Bartsch, T., et al. Transplantation of autologous mononuclear bone marrow stem cells in patients with peripheral arterial disease (the TAM-PAD study). Clin Res Cardiol 96, 891-899 (2007).

Baumgartner, I., et al. Constitutive expression of phVEGF165 after intramuscular gene transfer promotes collateral vessel development in patients with critical limb ischemia. Circulation 97, 1114-1123 (1998).

Beckman, J.A., Creager, M.A. & Libby, P. Diabetes and atherosclerosis: epidemiology, pathophysiology, and management. JAMA 287, 2570-2581 (2002).

Beenken, A. & Mohammadi, M. The FGF family: biology, pathophysiology and therapy. Nat Rev Drug Discov 8, 235-253 (2009).

Belch, J., et al. Effect of fibroblast growth factor NV1FGF on amputation and death: a randomised placebo-controlled trial of gene therapy in critical limb ischaemia. Lancet 377, 1929-1937 (2011).

Belch, J.J., et al. Critical issues in peripheral arterial disease detection and management: a call to action. Arch Intern Med 163, 884-892 (2003).

Benedito, R., et al. The notch ligands Dll4 and Jagged1 have opposing effects on angiogenesis. Cell 137, 1124-1135 (2009).

Bentley, K., et al. The role of differential VE-cadherin dynamics in cell rearrangement during angiogenesis. Nat Cell Biol 16, 309-321 (2014).

Bergers, G. & Song, S. The role of pericytes in blood-vessel formation and maintenance. Neuro Oncol 7, 452-464 (2005).

Berridge, M.J. Inositol trisphosphate and calcium signalling. Nature 361, 315-325 (1993).

Bertolino, P., Deckers, M., Lebrin, F. & ten Dijke, P. Transforming growth factor-beta signal transduction in angiogenesis and vascular disorders. Chest 128, 585S-590S (2005).

Birchmeier, C., Birchmeier, W., Gherardi, E. & Vande Woude, G.F. Met, metastasis, motility and more. Nat Rev Mol Cell Biol 4, 915-925 (2003).

Blimkie, M.S., Fung, L.C., Petoukhov, E.S., Girard, C. & Klokov, D. Repair of DNA double-strand breaks is not modulated by low-dose gamma radiation in C57BL/6J mice. Radiat Res 181, 548-559 (2014).

Bosch-Marce, M., et al. Effects of aging and hypoxia-inducible factor-1 activity on angiogenic cell mobilization and recovery of perfusion after limb ischemia. Circ Res 101, 1310-1318 (2007).

Bradbury, A.W., et al. Bypass versus Angioplasty in Severe Ischaemia of the Leg (BASIL) trial: An intention-to-treat analysis of amputation-free and overall survival in patients randomized to a bypass surgery-first or a balloon angioplasty-first revascularization strategy. J Vasc Surg 51, 5S-17S (2010).

Brass, E.P., et al. Parenteral therapy with lipo-ecraprost, a lipid-based formulation of a PGE1 analog, does not alter six-month outcomes in patients with critical leg ischemia. J Vasc Surg 43, 752-759 (2006).

Brenner, D.J. Is the linear-no-threshold hypothesis appropriate for use in radiation protection? Favouring the proposition. Radiat Prot Dosimetry 97, 279-282; discussion 285 (2001).

Brigstock, D.R. Regulation of angiogenesis and endothelial cell function by connective tissue growth factor (CTGF) and cysteine-rich 61 (CYR61). Angiogenesis 5, 153-165 (2002).

Brindle, N.P., Saharinen, P. & Alitalo, K. Signaling and functions of angiopoietin-1 in vascular protection. Circ Res 98, 1014-1023 (2006).

Burdak-Rothkamm, S. & Prise, K.M. New molecular targets in radiotherapy: DNA damage signalling and repair in targeted and non-targeted cells. Eur J Pharmacol 625, 151-155 (2009).

Burke, A.P., et al. Healed plaque ruptures and sudden coronary death: evidence that subclinical rupture has a role in plaque progression. Circulation 103, 934-940 (2001).

Buysschaert, I., Carmeliet, P. & Dewerchin, M. Clinical and fundamental aspects of angiogenesis and anti-angiogenesis. Acta Clin Belg 62, 162-169 (2007).

Cadigan, K.M. & Nusse, R. Wnt signaling: a common theme in animal development. Genes Dev 11, 3286-3305 (1997).

Caliceti, C., Nigro, P., Rizzo, P. & Ferrari, R. ROS, Notch, and Wnt signaling pathways: crosstalk between three major regulators of cardiovascular biology. Biomed Res Int 2014, 318714 (2014).

Capla, J.M., et al. Diabetes impairs endothelial progenitor cell-mediated blood vessel formation in response to hypoxia. Plast Reconstr Surg 119, 59-70 (2007).

Carmeliet, P. & Jain, R.K. Molecular mechanisms and clinical applications of angiogenesis. Nature 473, 298-307 (2011).

Carmeliet, P. & Jain, R.K. Principles and mechanisms of vessel normalization for cancer and other angiogenic diseases. Nat Rev Drug Discov 10, 417-427 (2011).

Carmeliet, P. Angiogenesis in life, disease and medicine. Nature 438, 932-936 (2005).

Carmeliet, P., De Smet, F., Loges, S. & Mazzone, and M. Branching morphogenesis and antiangiogenesis candidates: tip cells lead the way. Nat Rev Clin Oncol 6, 315-326 (2009).

Carmeliet, P., et al. Abnormal blood vessel development and lethality in embryos lacking a single VEGF allele. Nature 380, 435-439 (1996).

Carmeliet, P., et al. Synergism between vascular endothelial growth factor and placental growth factor contributes to angiogenesis and plasma extravasation in pathological conditions. Nat Med 7, 575-583 (2001).

Cebe-Suarez, S., Zehnder-Fjallman, A. & Ballmer-Hofer, K. The role of VEGF receptors in angiogenesis; complex partnerships. Cell Mol Life Sci 63, 601-615 (2006).

Chan, D.A. & Giaccia, A.J. Hypoxia, gene expression, and metastasis. Cancer Metastasis Rev 26, 333-339 (2007).

Chanana, M., et al. Interaction of polyelectrolytes and their composites with living cells. Nano Lett 5, 2605-2612 (2005).

Chang, C.C., et al. Dose-dependent effect of radiation on angiogenic and angiostatic CXC chemokine expression in human endothelial cells. Cytokine 48, 295-302 (2009).

Chen, C.C. & Lau, L.F. Functions and mechanisms of action of CCN matricellular proteins. Int J Biochem Cell Biol 41, 771-783 (2009).

Chen, J.Z., et al. Number and activity of endothelial progenitor cells from peripheral blood in patients with hypercholesterolaemia. Clin Sci (Lond) 107, 273-280 (2004).

Chen, Y. & Du, X.Y. Functional properties and intracellular signaling of CCN1/Cyr61. J Cell Biochem 100, 1337-1345 (2007).

Chen, Y.H., et al. High glucose impairs early and late endothelial progenitor cells by modifying nitric oxide-related but not oxidative stress-mediated mechanisms. Diabetes 56, 1559-1568 (2007).

Cheruvu, P.K., et al. Frequency and distribution of thin-cap fibroatheroma and ruptured plaques in human coronary arteries: a pathologic study. J Am Coll Cardiol 50, 940-949 (2007).

            Chien, S. Mechanotransduction and endothelial cell homeostasis: the wisdom of the cell. Am J Physiol Heart Circ Physiol 292, H1209-1224 (2007).

Coats, P. & Wadsworth, R. Marriage of resistance and conduit arteries breeds critical limb ischemia. Am J Physiol Heart Circ Physiol 288, H1044-1050 (2005).

Coats, P., Jarajapu, Y.P., Hillier, C., McGrath, J.C. & Daly, C. The use of fluorescent nuclear dyes and laser scanning confocal microscopy to study the cellular aspects of arterial remodelling in human subjects with critical limb ischaemia. Exp Physiol 88, 547-554 (2003).

Cobellis, G., et al. Long-term effects of repeated autologous transplantation of bone marrow cells in patients affected by peripheral arterial disease. Bone Marrow Transplant 42, 667-672 (2008).

Comoglio, P.M., Giordano, S. & Trusolino, L. Drug development of MET inhibitors: targeting oncogene addiction and expedience. Nat Rev Drug Discov 7, 504-516 (2008).

Compernolle, V., et al. Loss of HIF-2alpha and inhibition of VEGF impair fetal lung maturation, whereas treatment with VEGF prevents fatal respiratory distress in premature mice. Nat Med 8, 702-710 (2002).

Connell, P.P., Kron, S.J. & Weichselbaum, R.R. Relevance and irrelevance of DNA damage response to radiotherapy. DNA Repair (Amst) 3, 1245-1251 (2004).

Conway, E.M., Collen, D. & Carmeliet, P. Molecular mechanisms of blood vessel growth. Cardiovasc Res 49, 507-521 (2001).

Corada, M., et al. Vascular endothelial-cadherin is an important determinant of microvascular integrity in vivo. Proc Natl Acad Sci U S A 96, 9815-9820 (1999).

Coran, A.G. & Warren, R. Arteriographic changes in femoropopliteal arteriosclerosis obliterans. A five-year follow-up study. N Engl J Med 274, 643-647 (1966).

Creager, M.A., et al. Effect of hypoxia-inducible factor-1alpha gene therapy on walking performance in patients with intermittent claudication. Circulation 124, 1765-1773 (2011).

Criqui, M.H., et al. Mortality over a period of 10 years in patients with peripheral arterial disease. N Engl J Med 326, 381-386 (1992).

Criqui, M.H., et al. The prevalence of peripheral arterial disease in a defined population. Circulation 71, 510-515 (1985).

Cross, M.J. & Claesson-Welsh, L. FGF and VEGF function in angiogenesis: signalling pathways, biological responses and therapeutic inhibition. Trends Pharmacol Sci 22, 201-207 (2001).

Da Silva, A., Widmer, L.K., Ziegler, H.W., Nissen, C. & Schweizer, W. The Basle longitudinal study: report on the relation of initial glucose level to baseline ECG abnormalities, peripheral artery disease, and subsequent mortality. J Chronic Dis 32, 797-803 (1979).

Dauer, L.T., et al. Review and evaluation of updated research on the health effects associated with low-dose ionising radiation. Radiat Prot Dosimetry 140, 103-136 (2010).

Davies, M.G. Critical limb ischemia: cell and molecular therapies for limb salvage. Methodist Debakey Cardiovasc J 8, 20-27 (2012).

Davignon, J. & Ganz, P. Role of endothelial dysfunction in atherosclerosis. Circulation 109, III27-32 (2004).

De Falco, E., et al. SDF-1 involvement in endothelial phenotype and ischemia-induced recruitment of bone marrow progenitor cells. Blood 104, 3472-3482 (2004).

De Haro, J., et al. Meta-analysis of randomized, controlled clinical trials in angiogenesis: gene and cell therapy in peripheral arterial disease. Heart Vessels 24, 321-328 (2009).

De Muinck, E.D. & Simons, M. Re-evaluating therapeutic neovascularization. J Mol Cell Cardiol 36, 25-32 (2004).

De Nigris, F., et al. Therapeutic effects of autologous bone marrow cells and metabolic intervention in the ischemic hindlimb of spontaneously hypertensive rats involve reduced cell senescence and CXCR4/Akt/eNOS pathways. J Cardiovasc Pharmacol 50, 424-433 (2007).

Delafontaine, P., Song, Y.H. & Li, Y. Expression, regulation, and function of IGF-1, IGF-1R, and IGF-1 binding proteins in blood vessels. Arterioscler Thromb Vasc Biol 24, 435-444 (2004).

Devaraj, S., Singh, U. & Jialal, I. The evolving role of C-reactive protein in atherothrombosis. Clin Chem 55, 229-238 (2009).

Dewhirst, M.W., Cao, Y. & Moeller, B. Cycling hypoxia and free radicals regulate angiogenesis and radiotherapy response. Nat Rev Cancer 8, 425-437 (2008).

Distler, J.H., et al. Angiogenic and angiostatic factors in the molecular control of angiogenesis. Q J Nucl Med 47, 149-161 (2003).

Dor, Y., et al. Conditional switching of VEGF provides new insights into adult neovascularization and pro-angiogenic therapy. EMBO J 21, 1939-1947 (2002).

Dormandy, J.A. & Murray, G.D. The fate of the claudicant--a prospective study of 1969 claudicants. Eur J Vasc Surg 5, 131-133 (1991).

Dormandy, J.A. & Rutherford, R.B. Management of peripheral arterial disease (PAD). TASC Working Group. TransAtlantic Inter-Society Consensus (TASC). J Vasc Surg 31, S1-S296 (2000).

Dosluoglu, H.H., et al. Does preferential use of endovascular interventions by vascular surgeons improve limb salvage, control of symptoms, and survival of patients with critical limb ischemia? Am J Surg 192, 572-576 (2006).

Doss, M. Linear No-Threshold Model VS. Radiation Hormesis. Dose Response 11, 480-497 (2013).

Dreger, P., et al. G-CSF-mobilized peripheral blood progenitor cells for allogeneic transplantation: safety, kinetics of mobilization, and composition of the graft. Br J Haematol 87, 609-613 (1994).

Duong Van Huyen, J.P., et al. Bone marrow-derived mononuclear cell therapy induces distal angiogenesis after local injection in critical leg ischemia. Mod Pathol 21, 837-846 (2008).

Edwards, J.M., Taylor, L.M., Jr.  & Porter, J.M. Limb salvage in end-stage renal disease (ESRD). Comparison of modern results in patients with and without ESRD. Arch Surg 123, 1164-1168 (1988).

Eelen, G., Cruys, B., Welti, J., De Bock, K. & Carmeliet, P. Control of vessel sprouting by genetic and metabolic determinants. Trends Endocrinol Metab 24, 589-596 (2013).

Eelen, G., de Zeeuw, P., Simons, M. & Carmeliet, P. Endothelial cell metabolism in normal and diseased vasculature. Circ Res 116, 1231-1244 (2015).

Eggen, D.A. & Solberg, L.A. Variation of atherosclerosis with age. Lab Invest 18, 571-579 (1968).

Fadini, G.P., Agostini, C. & Avogaro, A. Autologous stem cell therapy for peripheral arterial disease meta-analysis and systematic review of the literature. Atherosclerosis 209, 10-17 (2010).

Fadini, G.P., et al. Diabetes impairs progenitor cell mobilisation after hindlimb ischaemia-reperfusion injury in rats. Diabetologia 49, 3075-3084 (2006).

Fantl, W.J., et al. Distinct phosphotyrosines on a growth factor receptor bind to specific molecules that mediate different signaling pathways. Cell 69, 413-423 (1992).

Feinendegen, L.E., Brooks, A.L. & Morgan, W.F. Biological consequences and health risks of low-level exposure to ionizing radiation: commentary on the workshop. Health Phys 100, 247-259 (2011).

Ferrara, N. & Alitalo, K. Clinical applications of angiogenic growth factors and their inhibitors. Nat Med 5, 1359-1364 (1999).

Ferrara, N. Role of vascular endothelial growth factor in physiologic and pathologic angiogenesis: therapeutic implications. Semin Oncol 29, 10-14 (2002).

Ferrara, N. Role of vascular endothelial growth factor in regulation of physiological angiogenesis. Am J Physiol Cell Physiol 280, C1358-1366 (2001).

Ferrara, N. VEGF-A: a critical regulator of blood vessel growth. Eur Cytokine Netw 20, 158-163 (2009).

Ferrari, R., Bachetti, T., Agnoletti, L., Comini, L. & Curello, S. Endothelial function and dysfunction in heart failure. Eur Heart J 19 Suppl G, G41-47 (1998).

Fischer, C., Mazzone, M., Jonckx, B. & Carmeliet, P. FLT1 and its ligands VEGFB and PlGF: drug targets for anti-angiogenic therapy? Nat Rev Cancer 8, 942-956 (2008).

Folkman, J. Angiogenesis in cancer, vascular, rheumatoid and other disease. Nat Med 1, 27-31 (1995).

Folkman, J. Therapeutic angiogenesis in ischemic limbs. Circulation 97, 1108-1110 (1998).

Fong, G.H., Rossant, J., Gertsenstein, M. & Breitman, M.L. Role of the Flt-1 receptor tyrosine kinase in regulating the assembly of vascular endothelium. Nature 376, 66-70 (1995).

Fowkes, F.G., et al. Edinburgh Artery Study: prevalence of asymptomatic and symptomatic peripheral arterial disease in the general population. Int J Epidemiol 20, 384-392 (1991).

Franz, R.W., et al. Short- to mid-term results using autologous bone-marrow mononuclear cell implantation therapy as a limb salvage procedure in patients with severe peripheral arterial disease. Vasc Endovascular Surg 45, 398-406 (2011).

Franz, R.W., et al. Use of autologous bone marrow mononuclear cell implantation therapy as a limb salvage procedure in patients with severe peripheral arterial disease. J Vasc Surg 50, 1378-1390 (2009).

G, L. Pathophysiology of critical ischaemia. In: Critical Leg Ischaemia, edited by Dormandy JA and Stock G. London: Springer-Verlag, 21-32 (1990).

Gaengel, K., Genove, G., Armulik, A. & Betsholtz, C. Endothelial-mural cell signaling in vascular development and angiogenesis. Arterioscler Thromb Vasc Biol 29, 630-638 (2009).

Garcia-Barros, M., et al. Tumor response to radiotherapy regulated by endothelial cell apoptosis. Science 300, 1155-1159 (2003).

Goodhead, D.T. Initial events in the cellular effects of ionizing radiations: clustered damage in DNA. Int J Radiat Biol 65, 7-17 (1994).

Gorski, D.H., et al. Blockage of the vascular endothelial growth factor stress response increases the antitumor effects of ionizing radiation. Cancer Res 59, 3374-3378 (1999).

Grenon, S.M., Gagnon, J. & Hsiang, Y. Video in clinical medicine. Ankle-brachial index for assessment of peripheral arterial disease. N Engl J Med 361, e40 (2009).

Grossman, P.M., et al. Results from a phase II multicenter, double-blind placebo-controlled study of Del-1 (VLTS-589) for intermittent claudication in subjects with peripheral arterial disease. Am Heart J 153, 874-880 (2007).

Grundy, S.M., et al. Implications of recent clinical trials for the National Cholesterol Education Program Adult Treatment Panel III guidelines. Circulation 110, 227-239 (2004).

Gupta, R., Tongers, J. & Losordo, D.W. Human studies of angiogenic gene therapy. Circ Res 105, 724-736 (2009).

Hajra, L., et al. The NF-kappa B signal transduction pathway in aortic endothelial cells is primed for activation in regions predisposed to atherosclerotic lesion formation. Proc Natl Acad Sci U S A 97, 9052-9057 (2000).

Hamou, C., et al. Mesenchymal stem cells can participate in ischemic neovascularization. Plast Reconstr Surg 123, 45S-55S (2009).

Hankey, G.J., Norman, P.E. & Eikelboom, J.W. Medical treatment of peripheral arterial disease. JAMA 295, 547-553 (2006).

Harfouche, R., et al. Angiopoietin-1 activates both anti- and proapoptotic mitogen-activated protein kinases. FASEB J 17, 1523-1525 (2003).

Hattori, K., et al. Placental growth factor reconstitutes hematopoiesis by recruiting VEGFR1(+) stem cells from bone-marrow microenvironment. Nat Med 8, 841-849 (2002).

Hattori, K., et al. Vascular endothelial growth factor and angiopoietin-1 stimulate postnatal hematopoiesis by recruitment of vasculogenic and hematopoietic stem cells. J Exp Med 193, 1005-1014 (2001).

Heissig, B., et al. Low-dose irradiation promotes tissue revascularization through VEGF release from mast cells and MMP-9-mediated progenitor cell mobilization. J Exp Med 202, 739-750 (2005).

Heissig, B., et al. Recruitment of stem and progenitor cells from the bone marrow niche requires MMP-9 mediated release of kit-ligand. Cell 109, 625-637 (2002).

Hellberg, C., Ostman, A. & Heldin, C.H. PDGF and vessel maturation. Recent Results Cancer Res 180, 103-114 (2010).

Hernandez, P., et al. Autologous bone-marrow mononuclear cell implantation in patients with severe lower limb ischaemia: a comparison of using blood cell separator and Ficoll density gradient centrifugation. Atherosclerosis 194, e52-56 (2007).

Hernandez, Y.J., et al. Latent adeno-associated virus infection elicits humoral but not cell-mediated immune responses in a nonhuman primate model. J Virol 73, 8549-8558 (1999).

Hertzer, N.R. Fatal myocardial infarction following lower extremity revascularization. Two hundred seventy-three patients followed six to eleven postoperative years. Ann Surg 193, 492-498 (1981).

Hertzer, N.R., et al. Coronary artery disease in peripheral vascular patients. A classification of 1000 coronary angiograms and results of surgical management. Ann Surg 199, 223-233 (1984).

Hiatt, W.R. Treatment of disability in peripheral arterial disease: new drugs. Curr Drug Targets Cardiovasc Haematol Disord 4, 227-231 (2004).

Hiatt, W.R., Hoag, S. & Hamman, R.F. Effect of diagnostic criteria on the prevalence of peripheral arterial disease. The San Luis Valley Diabetes Study. Circulation 91, 1472-1479 (1995).

Higashi, Y., et al. Autologous bone-marrow mononuclear cell implantation improves endothelium-dependent vasodilation in patients with limb ischemia. Circulation 109, 1215-1218 (2004).

Hillen, F. & Griffioen, A.W. Tumour vascularization: sprouting angiogenesis and beyond. Cancer Metastasis Rev 26, 489-502 (2007).

Hinderer, S., Layland, S.L. & Schenke-Layland, K. ECM and ECM-like materials - Biomaterials for applications in regenerative medicine and cancer therapy. Adv Drug Deliv Rev 97, 260-269 (2016).

Hirsch, A.T., et al. ACC/AHA 2005 Practice Guidelines for the management of patients with peripheral arterial disease (lower extremity, renal, mesenteric, and abdominal aortic): a collaborative report from the American Association for Vascular Surgery/Society for Vascular Surgery, Society for Cardiovascular Angiography and Interventions, Society for Vascular Medicine and Biology, Society of Interventional Radiology, and the ACC/AHA Task Force on Practice Guidelines (Writing Committee to Develop Guidelines for the Management of Patients With Peripheral Arterial Disease): endorsed by the American Association of Cardiovascular and Pulmonary Rehabilitation; National Heart, Lung, and Blood Institute; Society for Vascular Nursing; TransAtlantic Inter-Society Consensus; and Vascular Disease Foundation. Circulation 113, e463-654 (2006).

Hirsch, A.T., Hiatt, W.R. & Committee, P.S. PAD awareness, risk, and treatment: new resources for survival--the USA PARTNERS program. Vasc Med 6, 9-12 (2001).

Hockel, M., et al. Purified monocyte-derived angiogenic substance (angiotropin) induces controlled angiogenesis associated with regulated tissue proliferation in rabbit skin. J Clin Invest 82, 1075-1090 (1988).

Hockel, M., Schlenger, K., Doctrow, S., Kissel, T. & Vaupel, P. Therapeutic angiogenesis. Arch Surg 128, 423-429 (1993).

Horie, T., et al. Long-term clinical outcomes for patients with lower limb ischemia implanted with G-CSF-mobilized autologous peripheral blood mononuclear cells. Atherosclerosis 208, 461-466 (2010).

Horowitz, A. & Simons, M. Branching morphogenesis. Circ Res 103, 784-795 (2008).

Hu, Q., Klippel, A., Muslin, A.J., Fantl, W.J. & Williams, L.T. Ras-dependent induction of cellular responses by constitutively active phosphatidylinositol-3 kinase. Science 268, 100-102 (1995).

Huang, P., et al. Autologous transplantation of granulocyte colony-stimulating factor-mobilized peripheral blood mononuclear cells improves critical limb ischemia in diabetes. Diabetes Care 28, 2155-2160 (2005).

Iafrati, M.D., et al. Early results and lessons learned from a multicenter, randomized, double-blind trial of bone marrow aspirate concentrate in critical limb ischemia. J Vasc Surg 54, 1650-1658 (2011).

Idei, N., et al. Autologous bone-marrow mononuclear cell implantation reduces long-term major amputation risk in patients with critical limb ischemia: a comparison of atherosclerotic peripheral arterial disease and Buerger disease. Circ Cardiovasc Interv 4, 15-25 (2011).

Iiyama, K., et al. Patterns of vascular cell adhesion molecule-1 and intercellular adhesion molecule-1 expression in rabbit and mouse atherosclerotic lesions and at sites predisposed to lesion formation. Circ Res 85, 199-207 (1999).

Imanishi, T., Moriwaki, C., Hano, T. & Nishio, I. Endothelial progenitor cell senescence is accelerated in both experimental hypertensive rats and patients with essential hypertension. J Hypertens 23, 1831-1837 (2005).

Ishida, A., et al. Autologous peripheral blood mononuclear cell implantation for patients with peripheral arterial disease improves limb ischemia. Circ J 69, 1260-1265 (2005).

Ishida, Y., et al. Pivotal role of the CCL5/CCR5 interaction for recruitment of endothelial progenitor cells in mouse wound healing. J Clin Invest 122, 711-721 (2012).

Ishikawa, T., et al. Mouse Wnt receptor gene Fzd5 is essential for yolk sac and placental angiogenesis. Development 128, 25-33 (2001).

Isner, J.M. & Asahara, T. Angiogenesis and vasculogenesis as therapeutic strategies for postnatal neovascularization. J Clin Invest 103, 1231-1236 (1999).

Isner, J.M. Arterial gene transfer of naked DNA for therapeutic angiogenesis: early clinical results. Adv Drug Deliv Rev 30, 185-197 (1998).

Isner, J.M.P., A.; Blair, R.; Haley, L.; Asahara, T. Arterial gene transfer for therapeutic angiogenesis: early clinical results. (London: Martin Dunitz Ltt, 1997).

Jain, R.K. Molecular regulation of vessel maturation. Nat Med 9, 685-693 (2003).

Jakobsson, L., et al. Endothelial cells dynamically compete for the tip cell position during angiogenic sprouting. Nat Cell Biol 12, 943-953 (2010).

Janic, B., et al. Human cord blood-derived AC133+ progenitor cells preserve endothelial progenitor characteristics after long term in vitro expansion. PLoS One 5, e9173 (2010).

Jelnes, R., et al. Fate in intermittent claudication: outcome and risk factors. Br Med J (Clin Res Ed) 293, 1137-1140 (1986).

Jensen, S.A., Vatten, L.J. & Myhre, H.O. The prevalence of chronic critical lower limb ischaemia in a population of 20,000 subjects 40-69 years of age. Eur J Vasc Endovasc Surg 32, 60-65 (2006).

Joiner, M.v.d.K., A. Basic Clinical Radiobiology, (Hoder Arnold, London, UK, 2009).

Jones, N., et al. Identification of Tek/Tie2 binding partners. Binding to a multifunctional docking site mediates cell survival and migration. J Biol Chem 274, 30896-30905 (1999).

Jones, W.S., et al. Temporal trends and geographic variation of lower-extremity amputation in patients with peripheral artery disease: results from U.S. Medicare 2000-2008. J Am Coll Cardiol 60, 2230-2236 (2012).

Kajiguchi, M., et al. Safety and efficacy of autologous progenitor cell transplantation for therapeutic angiogenesis in patients with critical limb ischemia. Circ J 71, 196-201 (2007).

Kaminska, B., Wesolowska, A. & Danilkiewicz, M. TGF beta signalling and its role in tumour pathogenesis. Acta Biochim Pol 52, 329-337 (2005).

Kangsamaksin, T., Tattersall, I.W. & Kitajewski, J. Notch functions in developmental and tumour angiogenesis by diverse mechanisms. Biochem Soc Trans 42, 1563-1568 (2014).

Kannel, W.B., Skinner, J.J., Jr., Schwartz, M.J. & Shurtleff, D. Intermittent claudication. Incidence in the Framingham Study. Circulation 41, 875-883 (1970).

Kano, M.R., et al. VEGF-A and FGF-2 synergistically promote neoangiogenesis through enhancement of endogenous PDGF-B-PDGFRbeta signaling. J Cell Sci 118, 3759-3768 (2005).

Kawamoto, A., et al. Intramuscular transplantation of G-CSF-mobilized CD34 (+) cells in patients with critical limb ischemia: a phase I/IIa, multicenter, single-blinded, dose-escalation clinical trial. Stem Cells 27, 2857-2864 (2009).

Kerbel, R.S. & Hawley, R.G. Interleukin 12: newest member of the antiangiogenesis club. J Natl Cancer Inst 87, 557-559 (1995).

Kim, D.I., et al. Angiogenesis facilitated by autologous whole bone marrow stem cell transplantation for Buerger's disease. Stem Cells 24, 1194-1200 (2006).

Kim, H., Kim, S., Baek, S.H. & Kwon, S.M. Pivotal Cytoprotective Mediators and Promising Therapeutic Strategies for Endothelial Progenitor Cell-Based Cardiovascular Regeneration. Stem Cells Int 2016, 8340257 (2016).

Kofler, N.M., et al. Notch signaling in developmental and tumor angiogenesis. Genes Cancer 2, 1106-1116 (2011).

Kontos, C.D., et al. Tyrosine 1101 of Tie2 is the major site of association of p85 and is required for activation of phosphatidylinositol 3-kinase and Akt. Mol Cell Biol 18, 4131-4140 (1998).

Kotchey, N.M., et al. A potential role of distinctively delayed blood clearance of recombinant adeno-associated virus serotype 9 in robust cardiac transduction. Mol Ther 19, 1079-1089 (2011).

Kudo, T., Chandra, F.A., Kwun, W.H., Haas, B.T. & Ahn, S.S. Changing pattern of surgical revascularization for critical limb ischemia over 12 years: endovascular vs. open bypass surgery. J Vasc Surg 44, 304-313 (2006).

Kumar, A.H. & Caplice, N.M. Clinical potential of adult vascular progenitor cells. Arterioscler Thromb Vasc Biol 30, 1080-1087 (2010).

Kundra, V., et al. Regulation of chemotaxis by the platelet-derived growth factor receptor-beta. Nature 367, 474-476 (1994).

Kuwano, M., et al. Angiogenesis factors. Intern Med 40, 565-572 (2001).

Kwon, S.M., et al. Specific Jagged-1 signal from bone marrow microenvironment is required for endothelial progenitor cell development for neovascularization. Circulation 118, 157-165 (2008).

Lara-Hernandez, R., et al. Safety and efficacy of therapeutic angiogenesis as a novel treatment in patients with critical limb ischemia. Ann Vasc Surg 24, 287-294 (2010).

Lasala, G.P. & Minguell, J.J. Vascular disease and stem cell therapies. Br Med Bull 98, 187-197 (2011).

Laschke, M.W., Elitzsch, A., Vollmar, B., Vajkoczy, P. & Menger, M.D. Combined inhibition of vascular endothelial growth factor (VEGF), fibroblast growth factor and platelet-derived growth factor, but not inhibition of VEGF alone, effectively suppresses angiogenesis and vessel maturation in endometriotic lesions. Hum Reprod 21, 262-268 (2006).

Laukkanen, M.O., et al. Low-dose total body irradiation causes clonal fluctuation of primate hematopoietic stem and progenitor cells. Blood 105, 1010-1015 (2005).

Lavergne, M., et al. Cord blood-circulating endothelial progenitors for treatment of vascular diseases. Cell Prolif 44 Suppl 1, 44-47 (2011).

Laverty, H.G., Wakefield, L.M., Occleston, N.L., O'Kane, S. & Ferguson, M.W. TGF-beta3 and cancer: a review. Cytokine Growth Factor Rev 20, 305-317 (2009).

Lawall, H., Bramlage, P. & Amann, B. Stem cell and progenitor cell therapy in peripheral artery disease. A critical appraisal. Thromb Haemost 103, 696-709 (2010).

Leask, A. & Abraham, D.J. All in the CCN family: essential matricellular signaling modulators emerge from the bunker. J Cell Sci 119, 4803-4810 (2006).

Lechleider, R.J., et al. Activation of the SH2-containing phosphotyrosine phosphatase SH-PTP2 by its binding site, phosphotyrosine 1009, on the human platelet-derived growth factor receptor. J Biol Chem 268, 21478-21481 (1993).

Lederman, R.J., et al. Therapeutic angiogenesis with recombinant fibroblast growth factor-2 for intermittent claudication (the TRAFFIC study): a randomised trial. Lancet 359, 2053-2058 (2002).

Lee, C.G., et al. Anti-Vascular endothelial growth factor treatment augments tumor radiation response under normoxic or hypoxic conditions. Cancer Res 60, 5565-5570 (2000).

Lee, J.M. & Bernstein, A. p53 mutations increase resistance to ionizing radiation. Proc Natl Acad Sci U S A 90, 5742-5746 (1993).

Lehnert, S. Biomolecular action of ionizing radiation. (Taylor & Francis, Lew York, 2007).

Li, A., et al. Autocrine role of interleukin-8 in induction of endothelial cell proliferation, survival, migration and MMP-2 production and angiogenesis. Angiogenesis 8, 63-71 (2005).

Lindsberg, P.J., Carpen, O., Paetau, A., Karjalainen-Lindsberg, M.L. & Kaste, M. Endothelial ICAM-1 expression associated with inflammatory cell response in human ischemic stroke. Circulation 94, 939-945 (1996).

Linet, M.S., et al. Cancer risks associated with external radiation from diagnostic imaging procedures. CA Cancer J Clin 62, 75-100 (2012).

Little, M.P., Wakeford, R., Tawn, E.J., Bouffler, S.D. & Berrington de Gonzalez, A. Risks associated with low doses and low dose rates of ionizing radiation: why linearity may be (almost) the best we can do. Radiology 251, 6-12 (2009).

Liu, X., Sun, Y., Weinberg, R.A. & Lodish, H.F. Ski/Sno and TGF-beta signaling. Cytokine Growth Factor Rev 12, 1-8 (2001).

Lobrich, M. & Jeggo, P.A. The impact of a negligent G2/M checkpoint on genomic instability and cancer induction. Nat Rev Cancer 7, 861-869 (2007).

Long-term mortality and its predictors in patients with critical leg ischaemia. The I.C.A.I. Group (Gruppo di Studio dell'Ischemia Cronica Critica degli Arti Inferiori). The Study Group of Criticial Chronic Ischemia of the Lower Exremities. Eur J Vasc Endovasc Surg 14, 91-95 (1997).

Loomans, C.J., et al. Endothelial progenitor cell dysfunction: a novel concept in the pathogenesis of vascular complications of type 1 diabetes. Diabetes 53, 195-199 (2004).

Losordo, D.W., et al. A randomized, controlled pilot study of autologous CD34+ cell therapy for critical limb ischemia. Circ Cardiovasc Interv 5, 821-830 (2012).

Lotfi, S., et al. Towards a more relevant hind limb model of muscle ischaemia. Atherosclerosis 227, 1-8 (2013).

Loughna, S. & Sato, T.N. A combinatorial role of angiopoietin-1 and orphan receptor TIE1 pathways in establishing vascular polarity during angiogenesis. Mol Cell 7, 233-239 (2001).

Mac Gabhann, F., Ji, J.W. & Popel, A.S. Multi-scale computational models of pro-angiogenic treatments in peripheral arterial disease. Ann Biomed Eng 35, 982-994 (2007).

Madani, I., De Neve, W. & Mareel, M. Does ionizing radiation stimulate cancer invasion and metastasis? Bull Cancer 95, 292-300 (2008).

            Magnusson, P.U., et al. Platelet-derived growth factor receptor-beta constitutive activity promotes angiogenesis in vivo and in vitro. Arterioscler Thromb Vasc Biol 27, 2142-2149 (2007).

Maier, R.V. & Bulger, E.M. Endothelial changes after shock and injury. New Horiz 4, 211-223 (1996).

Marron, M.B., et al. Regulated proteolytic processing of Tie1 modulates ligand responsiveness of the receptor-tyrosine kinase Tie2. J Biol Chem 282, 30509-30517 (2007).

Master, Z., et al. Dok-R plays a pivotal role in angiopoietin-1-dependent cell migration through recruitment and activation of Pak. EMBO J 20, 5919-5928 (2001).

Masuda, H., et al. Methodological development of a clonogenic assay to determine endothelial progenitor cell potential. Circ Res 109, 20-37 (2011).

Matoba, S., et al. Long-term clinical outcome after intramuscular implantation of bone marrow mononuclear cells (Therapeutic Angiogenesis by Cell Transplantation [TACT] trial) in patients with chronic limb ischemia. Am Heart J 156, 1010-1018 (2008).

Mauceri, H.J., et al. Combined effects of angiostatin and ionizing radiation in antitumour therapy. Nature 394, 287-291 (1998).

Maulik, G., et al. Role of the hepatocyte growth factor receptor, c-Met, in oncogenesis and potential for therapeutic inhibition. Cytokine Growth Factor Rev 13, 41-59 (2002).

Maynard, S.E., et al. Excess placental soluble fms-like tyrosine kinase 1 (sFlt1) may contribute to endothelial dysfunction, hypertension, and proteinuria in preeclampsia. J Clin Invest 111, 649-658 (2003).

McBride, W.H., et al. A sense of danger from radiation. Radiat Res 162, 1-19 (2004).

McCarthy, M.J., Crowther, M., Bell, P.R. & Brindle, N.P. The endothelial receptor tyrosine kinase tie-1 is upregulated by hypoxia and vascular endothelial growth factor. FEBS Lett 423, 334-338 (1998).

McDaniel, M.D. & Cronenwett, J.L. Basic data related to the natural history of intermittent claudication. Ann Vasc Surg 3, 273-277 (1989).

McDermott, M.M., et al. Prevalence and significance of unrecognized lower extremity peripheral arterial disease in general medicine practice*. J Gen Intern Med 16, 384-390 (2001).

McEwan, A.J. & Ledingham, I.M. Blood flow characteristics and tissue nutrition in apparently ischaemic feet. Br Med J 3, 220-224 (1971).

Meeren, A.V., Bertho, J.M., Vandamme, M. & Gaugler, M.H. ionizing radiation enhances IL-6 and IL-8 production by human endothelial cells. Mediators Inflamm 6, 185-193 (1997).

Melliere, D., Cron, J., Allaire, E., Desgranges, P. & Becquemin, J.P. Indications and benefits of simultaneous endoluminal balloon angioplasty and open surgery during elective lower limb revascularization. Cardiovasc Surg 7, 242-246 (1999).

Michaud, S.E., Dussault, S., Haddad, P., Groleau, J. & Rivard, A. Circulating endothelial progenitor cells from healthy smokers exhibit impaired functional activities. Atherosclerosis 187, 423-432 (2006).

Mitchel, R.E. Low doses of radiation are protective in vitro and in vivo: evolutionary origins. Dose Response 4, 75-90 (2006).

Moazzami, K., Majdzadeh, R. & Nedjat, S. Local intramuscular transplantation of autologous mononuclear cells for critical lower limb ischaemia. Cochrane Database Syst Rev, CD008347 (2011).

Moeller, B.J., Cao, Y., Li, C.Y. & Dewhirst, M.W. Radiation activates HIF-1 to regulate vascular radiosensitivity in tumors: role of reoxygenation, free radicals, and stress granules. Cancer Cell 5, 429-441 (2004).

Moreno, P.R., Purushothaman, K.R., Zias, E., Sanz, J. & Fuster, V. Neovascularization in human atherosclerosis. Curr Mol Med 6, 457-477 (2006).

Morgan, W.F. Non-targeted and delayed effects of exposure to ionizing radiation: II. Radiation-induced genomic instability and bystander effects in vivo, clastogenic factors and transgenerational effects. Radiat Res 159, 581-596 (2003).

Mosch, B., Reissenweber, B., Neuber, C. & Pietzsch, J. Eph receptors and ephrin ligands: important players in angiogenesis and tumor angiogenesis. J Oncol 2010, 135285 (2010).

Muluk, S.C., et al. Outcome events in patients with claudication: a 15-year study in 2777 patients. J Vasc Surg 33, 251-257; discussion 257-258 (2001).

Murakami, M., Elfenbein, A. & Simons, M. Non-canonical fibroblast growth factor signalling in angiogenesis. Cardiovasc Res 78, 223-231 (2008).

Murakami, M., et al. The FGF system has a key role in regulating vascular integrity. J Clin Invest 118, 3355-3366 (2008).

Murohara, T. Autologous adipose tissue as a new source of progenitor cells for therapeutic angiogenesis. J Cardiol 53, 155-163 (2009).

Murphy, M.P., et al. Allogeneic endometrial regenerative cells: an "Off the shelf solution" for critical limb ischemia? J Transl Med 6, 45 (2008).

Nagy, J.A., Dvorak, A.M. & Dvorak, H.F. VEGF-A and the induction of pathological angiogenesis. Annu Rev Pathol 2, 251-275 (2007).

National Cholesterol Education Program Expert Panel on Detection, E. & Treatment of High Blood Cholesterol in, A. Third Report of the National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III) final report. Circulation 106, 3143-3421 (2002).

Natural history of aortic and coronary atherosclerotic lesions in youth. Findings from the PDAY Study. Pathobiological Determinants of Atherosclerosis in Youth (PDAY) Research Group. Arterioscler Thromb 13, 1291-1298 (1993).

Neufeld, G. & Kessler, O. The semaphorins: versatile regulators of tumour progression and tumour angiogenesis. Nat Rev Cancer 8, 632-645 (2008).

Newman, A.B., et al. Ankle-arm index as a predictor of cardiovascular disease and mortality in the Cardiovascular Health Study. The Cardiovascular Health Study Group. Arterioscler Thromb Vasc Biol 19, 538-545 (1999).

Nikol, S., et al. Therapeutic angiogenesis with intramuscular NV1FGF improves amputation-free survival in patients with critical limb ischemia. Mol Ther 16, 972-978 (2008).

Nisa, L., Aebersold, D.M., Giger, R., Zimmer, Y. & Medova, M. Biological, diagnostic and therapeutic relevance of the MET receptor signaling in head and neck cancer. Pharmacol Ther 143, 337-349 (2014).

Norgren, L., et al. Inter-Society Consensus for the Management of Peripheral Arterial Disease (TASC II). Eur J Vasc Endovasc Surg 33 Suppl 1, S1-75 (2007).

Norgren, L., et al. Inter-Society Consensus for the Management of Peripheral Arterial Disease (TASC II). J Vasc Surg 45 Suppl S, S5-67 (2007).

Nussenbaum, F. & Herman, I.M. Tumor angiogenesis: insights and innovations. J Oncol 2010, 132641 (2010).

Nyberg, P., Xie, L. & Kalluri, R. Endogenous inhibitors of angiogenesis. Cancer Res 65, 3967-3979 (2005).

Okabe, K., et al. Neurons limit angiogenesis by titrating VEGF in retina. Cell 159, 584-596 (2014).

Ouriel, K. Peripheral arterial disease. Lancet 358, 1257-1264 (2001).

Pacilli, A., Faggioli, G., Stella, A. & Pasquinelli, G. An update on therapeutic angiogenesis for peripheral vascular disease. Ann Vasc Surg 24, 258-268 (2010).

Palmer-Kazen, U. & Wahlberg, E. Arteriogenesis in peripheral arterial disease. Endothelium 10, 225-232 (2003).

Pawlik, T.M. & Keyomarsi, K. Role of cell cycle in mediating sensitivity to radiotherapy. Int J Radiat Oncol Biol Phys 59, 928-942 (2004).

Pepper, M.S. Transforming growth factor-beta: vasculogenesis, angiogenesis, and vessel wall integrity. Cytokine Growth Factor Rev 8, 21-43 (1997).

Phng, L.K. & Gerhardt, H. Angiogenesis: a team effort coordinated by notch. Dev Cell 16, 196-208 (2009).

Pober, J.S., Min, W. & Bradley, J.R. Mechanisms of endothelial dysfunction, injury, and death. Annu Rev Pathol 4, 71-95 (2009).

Polytarchou, C., Gligoris, T., Kardamakis, D., Kotsaki, E. & Papadimitriou, E. X-rays affect the expression of genes involved in angiogenesis. Anticancer Res 24, 2941-2945 (2004).

Potente, M., Gerhardt, H. & Carmeliet, P. Basic and therapeutic aspects of angiogenesis. Cell 146, 873-887 (2011).

Powell, R.J., et al. Cellular therapy with Ixmyelocel-T to treat critical limb ischemia: the randomized, double-blind, placebo-controlled RESTORE-CLI trial. Mol Ther 20, 1280-1286 (2012).

Powell, R.J., et al. Results of a double-blind, placebo-controlled study to assess the safety of intramuscular injection of hepatocyte growth factor plasmid to improve limb perfusion in patients with critical limb ischemia. Circulation 118, 58-65 (2008).

Presta, M., et al. Fibroblast growth factor/fibroblast growth factor receptor system in angiogenesis. Cytokine Growth Factor Rev 16, 159-178 (2005).

Preston, R.J., et al. Uncertainties in estimating health risks associated with exposure to ionising radiation. J Radiol Prot 33, 573-588 (2013).

Quarmby, S., Hunter, R.D. & Kumar, S. Irradiation induced expression of CD31, ICAM-1 and VCAM-1 in human microvascular endothelial cells. Anticancer Res 20, 3375-3381 (2000).

Rafii, S., Heissig, B. & Hattori, K. Efficient mobilization and recruitment of marrow-derived endothelial and hematopoietic stem cells by adenoviral vectors expressing angiogenic factors. Gene Ther 9, 631-641 (2002).

Rajagopalan, S., et al. Regional angiogenesis with vascular endothelial growth factor in peripheral arterial disease: a phase II randomized, double-blind, controlled study of adenoviral delivery of vascular endothelial growth factor 121 in patients with disabling intermittent claudication. Circulation 108, 1933-1938 (2003).

Rajendran, P., et al. The vascular endothelium and human diseases. Int J Biol Sci 9, 1057-1069 (2013).

Ramirez, H., Patel, S.B. & Pastar, I. The Role of TGFbeta Signaling in Wound Epithelialization. Adv Wound Care (New Rochelle) 3, 482-491 (2014).

Ratliff, B.B., et al. Endothelial progenitors encapsulated in bioartificial niches are insulated from systemic cytotoxicity and are angiogenesis competent. Am J Physiol Renal Physiol 299, F178-186 (2010).

Reed, M.J., Karres, N., Eyman, D. & Edelberg, J. Endothelial precursor cells. Stem Cell Rev 3, 218-225 (2007).

Regensteiner, J.G. & Hiatt, W.R. Current medical therapies for patients with peripheral arterial disease: a critical review. Am J Med 112, 49-57 (2002).

Resnick, N. & Gimbrone, M.A., Jr. Hemodynamic forces are complex regulators of endothelial gene expression. FASEB J 9, 874-882 (1995).

Risau, W. Mechanisms of angiogenesis. Nature 386, 671-674 (1997).

Rizzo, P., et al. The role of notch in the cardiovascular system: potential adverse effects of investigational notch inhibitors. Front Oncol 4, 384 (2014).

Rooke, T.W., et al. 2011 ACCF/AHA Focused Update of the Guideline for the Management of Patients With Peripheral Artery Disease (updating the 2005 guideline): a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol 58, 2020-2045 (2011).

Rubanyi, G.M. & Vanhoutte, P.M. Superoxide anions and hyperoxia inactivate endothelium-derived relaxing factor. Am J Physiol 250, H822-827 (1986).

Rutherford: Vascular Surgery, (Copyright © 2005 Elsevier, 2005).

Sanchez, L.A., et al. Limb salvage surgery in end stage renal disease: is it worthwhile? J Cardiovasc Surg (Torino) 33, 344-348 (1992).

Sanders, C.L. Potential treatment of inflammatory and proliferative diseases by ultra-low doses of ionizing radiations. Dose Response 10, 610-625 (2012).

Sasaki, M.S., Tachibana, A. & Takeda, S. Cancer risk at low doses of ionizing radiation: artificial neural networks inference from atomic bomb survivors. J Radiat Res 55, 391-406 (2014).

Sato, T.N., et al. Distinct roles of the receptor tyrosine kinases Tie-1 and Tie-2 in blood vessel formation. Nature 376, 70-74 (1995).

Sawa, H.K., H.C. Wnt signaling in C. elegans (The C. elegans Research Community, WormBook, doi/10.1895/wormbook.1.7.2, http://www.wormbook.org, 2013).

Schainfeld, R.M. & Isner, J.M. Critical limb ischemia: nothing to give at the office? Ann Intern Med 130, 442-444 (1999).

Schaper, W. & Buschmann, I. Arteriogenesis, the good and bad of it. Cardiovasc Res 43, 835-837 (1999).

Schaper, W. Collateral circulation: past and present. Basic Res Cardiol 104, 5-21 (2009).

Schiekofer, S., Galasso, G., Sato, K., Kraus, B.J. & Walsh, K. Impaired revascularization in a mouse model of type 2 diabetes is associated with dysregulation of a complex angiogenic-regulatory network. Arterioscler Thromb Vasc Biol 25, 1603-1609 (2005).

Schindl, A., Heinze, G., Schindl, M., Pernerstorfer-Schon, H. & Schindl, L. Systemic effects of low-intensity laser irradiation on skin microcirculation in patients with diabetic microangiopathy. Microvasc Res 64, 240-246 (2002).

Schratzberger, P., et al. Reversal of experimental diabetic neuropathy by VEGF gene transfer. J Clin Invest 107, 1083-1092 (2001).

Schrimpf, C., et al. Pericyte TIMP3 and ADAMTS1 modulate vascular stability after kidney injury. J Am Soc Nephrol 23, 868-883 (2012).

Schwartz, J.D., Rowinsky, E.K., Youssoufian, H., Pytowski, B. & Wu, Y. Vascular endothelial growth factor receptor-1 in human cancer: concise review and rationale for development of IMC-18F1 (Human antibody targeting vascular endothelial growth factor receptor-1). Cancer 116, 1027-1032 (2010).

Seger, R. & Krebs, E.G. The MAPK signaling cascade. FASEB J 9, 726-735 (1995).

Shalaby, F., et al. Failure of blood-island formation and vasculogenesis in Flk-1-deficient mice. Nature 376, 62-66 (1995).

Shi, Q., et al. Evidence for circulating bone marrow-derived endothelial cells. Blood 92, 362-367 (1998).

Sigvant, B., et al. A population-based study of peripheral arterial disease prevalence with special focus on critical limb ischemia and sex differences. J Vasc Surg 45, 1185-1191 (2007).

Simons, M. Angiogenesis: where do we stand now? Circulation 111, 1556-1566 (2005).

Smith, S.C., Jr., et al. AHA/ACC guidelines for secondary prevention for patients with coronary and other atherosclerotic vascular disease: 2006 update: endorsed by the National Heart, Lung, and Blood Institute. Circulation 113, 2363-2372 (2006).

Sofia Vala, I., et al. Low doses of ionizing radiation promote tumor growth and metastasis by enhancing angiogenesis. PLoS One 5, e11222 (2010).

Sonveaux, P., et al. Irradiation-induced angiogenesis through the up-regulation of the nitric oxide pathway: implications for tumor radiotherapy. Cancer Res 63, 1012-1019 (2003).

Stary, H.C. Atlas of Atherosclerosis: Progression and Regression. (Parthenon Publishing Group, New York, 2003).

Steel, G.G. Basic Clinical Radiobiology, (Hodder Arnold, London, UK, 2002).

Steinl, D.C. & Kaufmann, B.A. Ultrasound imaging for risk assessment in atherosclerosis. Int J Mol Sci 16, 9749-9769 (2015).

Storkebaum, E., Lambrechts, D. & Carmeliet, P. VEGF: once regarded as a specific angiogenic factor, now implicated in neuroprotection. Bioessays 26, 943-954 (2004).

Strong, J.P., et al. Prevalence and extent of atherosclerosis in adolescents and young adults: implications for prevention from the Pathobiological Determinants of Atherosclerosis in Youth Study. JAMA 281, 727-735 (1999).

Suchting, S., et al. The Notch ligand Delta-like 4 negatively regulates endothelial tip cell formation and vessel branching. Proc Natl Acad Sci U S A 104, 3225-3230 (2007).

Sun, L., Bai, Y. & Du, G. Endothelial dysfunction--an obstacle of therapeutic angiogenesis. Ageing Res Rev 8, 306-313 (2009).

Sweet, D.T., et al. Endothelial Shc regulates arteriogenesis through dual control of arterial specification and inflammation via the notch and nuclear factor-kappa-light-chain-enhancer of activated B-cell pathways. Circ Res 113, 32-39 (2013).

Tait, C.R. & Jones, P.F. Angiopoietins in tumours: the angiogenic switch. J Pathol 204, 1-10 (2004).

Takahashi, H. & Shibuya, M. The vascular endothelial growth factor (VEGF)/VEGF receptor system and its role under physiological and pathological conditions. Clin Sci (Lond) 109, 227-241 (2005).

Takahashi, T., et al. Ischemia- and cytokine-induced mobilization of bone marrow-derived endothelial progenitor cells for neovascularization. Nat Med 5, 434-438 (1999).

Tang, G.L., Chang, D.S., Sarkar, R., Wang, R. & Messina, L.M. The effect of gradual or acute arterial occlusion on skeletal muscle blood flow, arteriogenesis, and inflammation in rat hindlimb ischemia. J Vasc Surg 41, 312-320 (2005).

Taniyama, Y., et al. Therapeutic angiogenesis induced by human hepatocyte growth factor gene in rat diabetic hind limb ischemia model: molecular mechanisms of delayed angiogenesis in diabetes. Circulation 104, 2344-2350 (2001).

Tapio, S. & Jacob, V. Radioadaptive response revisited. Radiat Environ Biophys 46, 1-12 (2007).

Tashiro, K., et al. Deduced primary structure of rat hepatocyte growth factor and expression of the mRNA in rat tissues. Proc Natl Acad Sci U S AN 87, 3200-3204 (1990).

Taylor, L.M., Jr., Hamre, D., Dalman, R.L. & Porter, J.M. Limb salvage vs amputation for critical ischemia. The role of vascular surgery. Arch Surg 126, 1251-1257; discussion 1257-1258 (1991).

Teicher, B.A., et al. Influence of an anti-angiogenic treatment on 9L gliosarcoma: oxygenation and response to cytotoxic therapy. Int J Cancer 61, 732-737 (1995).

Tepper, O.M., et al. Human endothelial progenitor cells from type II diabetic’s exhibit impaired proliferation, adhesion, and incorporation into vascular structures. Circulation 106, 2781-2786 (2002).

The 2007 Recommendations of the International Commission on Radiological Protection. ICRP publication 103. Ann ICRP 37, 1-332 (2007).

Thisse, B. & Thisse, C. Functions and regulations of fibroblast growth factor signaling during embryonic development. Dev Biol 287, 390-402 (2005).

Thurston, G., et al. Angiopoietin-1 protects the adult vasculature against plasma leakage. Nat Med 6, 460-463 (2000).

Tubiana, M., Feinendegen, L.E., Yang, C. & Kaminski, J.M. The linear no-threshold relationship is inconsistent with radiation biologic and experimental data. Radiology 251, 13-22 (2009).

Turner, N. & Grose, R. Fibroblast growth factor signalling: from development to cancer. Nat Rev Cancer 10, 116-129 (2010).

Udan, R.S., Culver, J.C. & Dickinson, M.E. Understanding vascular development. Wiley Interdiscip Rev Dev Biol 2, 327-346 (2013).

Urbich, C., et al. Relevance of monocytic features for neovascularization capacity of circulating endothelial progenitor cells. Circulation 108, 2511-2516 (2003).

Van Cruijsen, H., Giaccone, G. & Hoekman, K. Epidermal growth factor receptor and angiogenesis: Opportunities for combined anticancer strategies. Int J Cancer 117, 883-888 (2005).

Van Hinsbergh, V.W. & Koolwijk, P. Endothelial sprouting and angiogenesis: matrix metalloproteinases in the lead. Cardiovasc Res 78, 203-212 (2008).

Van Royen, N., et al. Stimulation of arteriogenesis; a new concept for the treatment of arterial occlusive disease. Cardiovasc Res 49, 543-553 (2001).

Van Tongeren, R.B., et al. Intramuscular or combined intramuscular/intra-arterial administration of bone marrow mononuclear cells: a clinical trial in patients with advanced limb ischemia. J Cardiovasc Surg (Torino) 49, 51-58 (2008).

Vandekeere, S., Dewerchin, M. & Carmeliet, P. Angiogenesis Revisited: An Overlooked Role of Endothelial Cell Metabolism in Vessel Sprouting. Microcirculation 22, 509-517 (2015).

Varu, V.N., Hogg, M.E. & Kibbe, M.R. Critical limb ischemia. J Vasc Surg 51, 230-241 (2010).

Vempati, P., Popel, A.S. & Mac Gabhann, F. Extracellular regulation of VEGF: isoforms, proteolysis, and vascular patterning. Cytokine Growth Factor Rev 25, 1-19 (2014).

Violi, F., Criqui, M., Longoni, A. & Castiglioni, C. Relation between risk factors and cardiovascular complications in patients with peripheral vascular disease. Results from the A.D.E.P. study. Atherosclerosis 120, 25-35 (1996).

Virmani, R., Kolodgie, F.D., Burke, A.P., Farb, A. & Schwartz, S.M. Lessons from sudden coronary death: a comprehensive morphological classification scheme for atherosclerotic lesions. Arterioscler Thromb Vasc Biol 20, 1262-1275 (2000).

Von Essen, C.F. Radiation enhancement of metastasis: a review. Clin Exp Metastasis 9, 77-104 (1991).

Vouyouka, A.G. & Kent, K.C. Arterial vascular disease in women. J Vasc Surg 46, 1295-1302 (2007).

Walker, S.R., Yusuf, S.W. & Hopkinson, B.R. A 10-year follow-up of patients presenting with ischaemic rest pain of the lower limbs. Eur J Vasc Endovasc Surg 15, 478-482 (1998).

Walter, D.H., et al. Intraarterial administration of bone marrow mononuclear cells in patients with critical limb ischemia: a randomized-start, placebo-controlled pilot trial (PROVASA). Circ Cardiovasc Interv 4, 26-37 (2011).

Wang, L., et al. Notch-RBP-J signaling regulates the mobilization and function of endothelial progenitor cells by dynamic modulation of CXCR4 expression in mice. PLoS One 4, e7572 (2009).

Wang, R., et al. Glioblastoma stem-like cells give rise to tumour endothelium. Nature 468, 829-833 (2010).

Waters, R.E., Terjung, R.L., Peters, K.G. & Annex, B.H. Preclinical models of human peripheral arterial occlusive disease: implications for investigation of therapeutic agents. J Appl Physiol (1985) 97, 773-780 (2004).

Watson, O., et al. Blood flow suppresses vascular Notch signalling via dll4 and is required for angiogenesis in response to hypoxic signalling. Cardiovasc Res 100, 252-261 (2013).

Wegner, K., et al. Dynamics and feedback loops in the transforming growth factor beta signaling pathway. Biophys Chem 162, 22-34 (2012).

Whitehill, T.A. Role of revascularization in the treatment of claudication. Vasc Med 2, 252-256 (1997).

Wiedlocha, A. Following angiogenin during angiogenesis: a journey from the cell surface to the nucleolus. Arch Immunol Ther Exp (Warsz) 47, 299-305 (1999).

Yla-Herttuala, S. & Alitalo, K. Gene transfer as a tool to induce therapeutic vascular growth. Nat Med 9, 694-701 (2003).

Yancopoulos, G.D., et al. Vascular-specific growth factors and blood vessel formation. Nature 407, 242-248 (2000).

You, W.K. & McDonald, D.M. The hepatocyte growth factor/c-Met signaling pathway as a therapeutic target to inhibit angiogenesis. BMB Rep 41, 833-839 (2008).

Yu, S.P., Wei, Z. & Wei, L. Preconditioning strategy in stem cell transplantation therapy. Transl Stroke Res 4, 76-88 (2013).

Zachary, I. VEGF signalling: integration and multi-tasking in endothelial cell biology. Biochem Soc Trans 31, 1171-1177 (2003).

Zecca, M., Basler, K. & Struhl, G. Direct and long-range action of a wingless morphogen gradient. Cell 87, 833-844 (1996).

Zeng, G., et al. Non-linear chromosomal inversion response in prostate after low dose X-radiation exposure. Mutat Res 602, 65-73 (2006).

Zhang, S., et al. Comparison of various kinds of bone marrow stem cells for the repair of infarcted myocardium: single clonally purified non-hematopoietic mesenchymal stem cells serve as a superior source. J Cell Biochem 99, 1132-1147 (2006).

Zhang, S., et al. purified human bone marrow multipotent mesenchymal stem cells regenerate infarcted myocardium in experimental rats. Cell Transplant 14, 787-798 (2005).

Zhou, W., Wang, G. & Guo, S. Regulation of angiogenesis via Notch signaling in breast cancer and cancer stem cells. Biochim Biophys Acta 1836, 304-320 (2013).

Zhu, S., Liu, X., Li, Y., Goldschmidt-Clermont, P.J. & Dong, C. Aging in the atherosclerosis milieu may accelerate the consumption of bone marrow endothelial progenitor cells. Arterioscler Thromb Vasc Biol 27, 113-119 (2007).

Ziche, M. & Morbidelli, L. Nitric oxide and angiogenesis. J Neurooncol 50, 139-148 (2000).

 

 

 

 

 

 

 

 

 

 

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Weaning From Mechanical Ventilation for Adult Patient

            Abstract

            Weaning normally incorporate the complete procedure of the general liberation of the patient from mechanical support as well as from the endotracheal tubes. Given that mechanical ventilation weaning normally incurs significant costs, mortality and illness and also untimely and delayed extubation can result in harm weaning that can be categorized as safe and speedy is highly required. There are controversial concerns in regard to the best approach that should be utilized in the conduction of the mechanical weaning procedure. Weaning can be fastened by the use of SBT and every day’s screening of the functioning of the respiratory.  Respiratory rate can be categorized as the best successful weaning predictor. The utilization of now- aggressive ventilation models might be useful in improving the general outcome of a number of patients who might acquire respiratory failures during the extubation process. The study established that weaning should be considered the earliest possible. In addition SBT is the prime diagnostic test in the determination of whether extubation would be successful. Non-aggressive ventilation approaches should be utilized in shortening the intubation period but should thus not be utilized as often tools in reference to extubation failure. In achieving the study’s success the study utilized a systematic review approach to the recent evidence-based studies.

            Introduction

            Weaning from Mechanical Ventilation is best described as the general gradual procedures for withdrawing ventilatory sustenance. Close to 800,000 adult patients necessitate the support of mechanical ventilation every year (Chang, 2014). Undoubtedly this is an existence saving intervention but it is one of the approaches that are uptight with the probability of iatrogenesis particularly if the support is utilized extensively than the required period. Based on scientific estimations 90 percent of the critically ill adult patients require the support of mechanical ventilation and while acquiring the support the patients are amid the weaning procedures which account for approximately 40 percent of the general time (Chang, 2014). The discontinuation of mechanical ventilation support and the removal of reproduction Airways occupies a significant portion of the whole duration thus becoming a major concern for those working in the critical units. Delayed weaning procedures can result in complications such as an induced lung injury, pneumonia as well as diaphragmatic dysfunction that is associated with ventilator support. On the other hand, the induction of premature weaning can result in the raise of complications such as defective air exchange, airway, muscle fatigue of the respiratory and aspiration. The predictive level of the successful is accounted to be only about 35 to 60 percent based on physician’s decisions.

            Literature Review

            According to Esquinas, (2016) Mechanical ventilation has been through a radical transformation over the recent years. Contemporary ventilators are becoming highly sensitive thus permitting easy triggering of patients under supported breathing by the utilization of models like extubation. It is universally agreed that reducing the mechanical ventilator assistance and particularly of Endotracheal intubation can be categorized as the extremely significant objective of all the patients in consideration of the high incidences that are linked with illness and the high ventilator costs that are linked to pneumonia and additional critical consequences of the ventilated intubated state. Expeditiously both extubation and weaning should be conducted safely and efficiently as possible given that this is a significant high focus item for every individual participating in the critically sick patient’s management (Waldmann, Soni & Rhodes, 2008).

Based on Silverman, et al., (2007) Spontaneous breathing trials (SBT) evaluates the ability of the patient to breathe while acquiring minimized or zero mechanical ventilator assistance. Weaning and SBT procedures begin by an evaluation of whether the probable source of respiratory failure is resolved or not yet. There is no known agreement in regard to the criteria that is to be utilized in evaluating the existing condition’s reversal. However, the incorporation of both objective and subjective procedure is utilized in establishing reversal of the illness. Normally the utilized process is the development of air exchange, mental status growth, radiographic signs as well as neuromuscular evaluation. It is worth noting that even for the patients who fail to meet the set criteria in most cases they are ultimately weaned efficiently. Weaning can be fastened by the use of SBT as well as often respiratory functions screening. Respiratory level or ventilation ratios are good indicators of efficient weaning. The least effective weaning method is synchronized recurrent obligatory. The general utilization of non-aggressive mechanical ventilation may result in outcomes improvement for those patients that acquires failure of respiratory after extubation procedures (Slutsky & Brochard, 2005).

            According to Boles, et al., (2013) given that conventional aggressive ventilation is linked with several complications like pneumonia and tracheal stenosis most of these complications increases the probability with ventilation duration. It is thus essential to particularly wean patients while utilizing mechanical ventilation process sooner in the avoidance of such issues. Mechanical ventilation weaning involves the general reduction of ventilatory assistance which finally leads to the spontaneous breathing by patients and subjection in extubation. Truwit, (2011) states that the procedures can be achieved in rapid nature amid 80 percent of the involved patients after the initial respiratory failure cause has been developed. The rest of the cases rely on achieving gradual approaches of ventilation withdrawal (Vincent, 2011). Successful weaning is achieved when several factors have been accounted for. In that the existing illness must have been improved, the patient condition being ideal, the establishment of airways issues and appropriate remedies and the achievement of adequate breathing. In that for the success of weaning the initial respiratory cause must be solved to a level that is reasonable. There are numerous uncertainties in regard to the most suitable approaches to conducting the process and this requires the engagement of the patients throughout the recovery session from critical illnesses. This results in weaning being a crucial issue for both physicians and patients.

            Kreit, (2013) asserts that it has been demonstrated comprehensively that having now- healthcare physicians as bed huddles like nurses and therapists can effectively result in the execution of protocols which enhances the clinical results and lower the general costs for patients who are ill critically. Having the team members for the critical units who sticks to the patient's bedsides leads to weaning processes on hourly grounds rather than depending on the intermittent support which is in most cases infrequent, makes an essential sense degree, as well as offers, support to all the decisions of physicians (Papadakos & Dooley, 2007). It has been constantly demonstrated by studies that all the protocols of weaning that are created by physicians but are in turn conducted by nurses or even therapists lead to the reduction of the mechanical ventilation period without creating any advanced consequences. However, the success of the procedures depends on overcoming the associated attitudinal and all other involved challenges have given that the weaning protocols are just more than relying on a single option as they offer the best outcomes. Extubation and weaning are two differing procedures and thus some of the critically ailing patients can acquire weaning from mechanical or conventional ventilation but still necessitate a stimulated airway for the clearance of the secretion or the prevention of the upper sections airways aspiration and obstruction. These aspects should be accounted in that all patients are not to be involved in extubation after an efficient SBT process (Kreit, 2013).

            Respiratory Weaning

Respiratory weaning mainly refers to the general procedure of withdrawing the patients from the ventilator dependability which occurs in three different stages. In that, the patients are removed gradually from the supporting ventilator, after from the tube and then from oxygen support. Mechanical ventilation weaning is normally performed at the earliest possible period which is consistent with the safety of a patient (Ching-Ju, Chouh-Jiaun, Ya-Ling & Ling-Nu, 2009). This decision should be derived from physiologic rather than the consideration of the mechanical perspective. In that, a thorough patient’s status for the patient should be considered so that sound decisions can be derived. Weaning mainly begins after the recovery of the patient from the acute surgical and medical levels which permits the reverse of respiratory causes to be conducted effectively. Weaning success normally incorporates the engagement of the respiratory therapist, nurses as well as physicians. In that, the health providers must in adequacy comprehend their scopes in relation to the weaning of the patients in the conservation of the patient’s wellness and developing successful results (Ching-Ju, Chouh-Jiaun, Ya-Ling & Ling-Nu, 2009).

In the restoration of control since patients are encouraged by the medical givers to engage in decision creation in regard to care and probable treatment. Patients may be withdrawn from mechanical ventilation assistance particularly if the use was extensive. So that effective coping can be promoted progress is normally communicated to the respective patients appropriately.  Diversions such as television and music are usually provided to offer destructions which promote a relaxing surrounding (Montagnani, et l., 2011). Stress decreasing techniques are usually utilized as relaxing measures which helps in relieving tension thus promoting the general capability of patients in dealing with anxiety issues in regard to the dependence and condition of ventilator reliance. Mechanical ventilation is normally a necessity for a number of reasons which include the necessity for the patients to control their respiration or in the case of severe head injury treatment in oxygenating the body blood in instances when the ventilator abilities are not adequate as well as all the breathing muscles (Montagnani et l., 2011).

Spontaneous breathing can be established in patients under ventilator support but the effort that is required in this achievement is fatiguing. The mechanical ventilator can be categorized as negative or positive pressure breathing tool that normally maintains oxygen and ventilatory delivery for the extended period. Offering care to patients under mechanical support has grown to be an essential nursing care part in offering critical health care.  The particular pulmonary needs of the patients must be understood by the caregivers in the setting of achievable and wellness promoting goals (Herlihy, Koch, Jackson & Nora, 2006). Acquiring desirable patient results normally relies on the understanding of mechanical ventilation principles and the needs for offering care to patients with open communication.

            Mechanical Ventilator Weaning

Mechanical ventilation can be considered to be an important lifesaving technological advancement. However, there are several complications associate with the practice given that it influences illnesses and patient’s mortality for those acquiring intensive care. Thus, it is essential to utilize the safest as well as the most effective mechanical ventilation approach for the least period. Mechanical ventilation has a number of indicators (Montagnani et l., 2011). The main rationale is that patients are usually placed under artificial ventilation in the quest of fulfilling their general body’s oxygen demand, as well as carbon dioxide removal, gave that they do not have the capability to achieve this. Mechanical ventilation that is not – aggressive can be achieved via facial masks, nasal and invasive via the use of tracheotomy tubes. Mechanical ventilation period normally differs depending on the respiratory failure causes. For the critically ill mechanical ventilation is an induction control measure and in instances of physiologic functioning failure collapse, it is normally utilized as prophylaxis. Inadequate gases exchange, mechanical and respiratory insufficiencies are some of the physiological indicators (Herlihy, Koch, Jackson & Nora, 2006). Oxygen and carbon dioxide transportation amid the respiration and the surrounding is the operation of ventilation tool support.

Maintaining normal Po2 as well as Pco2 levels in the arterial body blood while the ventilator muscles are being unloaded is usually the desired mechanical ventilation assistance results (Herlihy, Koch, Jackson & Nora, 2006). To most individuals ventilators, are considered as respirators which are understandable based on the fact that their differences in health are technical rather than functional. While ventilators are involved in conveying air from one region to the next the function of respirators is to facilitate gases exchanges. Apparently initiating ventilatory support tends to be much easier than the withdrawal. This is because respiratory needs differ from an individual to another thus returning patients to their normal breathing is to be done based on the needs of each patient. This, therefore, implies that weaning program is to be customized based on the patient’s necessities. A patient under ventilatory support is perceived to be ready in acquiring wean after the need for being supported by ventilators is stabilized. It should be noted that there are a number of ways through which patients can be placed under weaning and conducted in differing modes (Herlihy, Koch, Jackson & Nora, 2006).

The four models of withdrawing patients from the support of mechanical ventilation include the use of SIMV, PSV, SBT (Spontaneous Breathing Trials) which does not incorporate the use of consistent air pressure and NPPV (Unoki, Serita, & Grap, 2008). Most healthcare providers mainly rely on the use of SIMV and NPPV while a number of them prefer the combination for success to be achieved throughout the procedure. NPPV role is currently involved in an evolution given that it is a continuous approach this serves as an Extubation and discontinues approach in those patients that have been intubating as an avoidance association which serves as the prophylactic role in the postoperative patients who are involved in the increased risk of experiencing respiratory issues. SBT, SIMV or even PSV models have demonstrated to be more superior based on the results of a number of studies (Unoki, Serita, & Grap, 2008). In the general quest of achieving mechanical ventilation discontinuation a number of, untraditional approaches have been utilized which includes training for respiratory resistance and minute capacity mandatory ventilation. It has been demonstrated that the triggering flow leads to a decrease of the breathing work in COPD adults and infants. Similarly, t infants COPD patients are usually very vulnerable to auto- looks which may rise the breathing work thus preventing the initiation of ventilatory weaning support (Unoki, Serita, & Grap, 2008).

Careful evaluation is normally necessitated in the determination of the readiness of the patients in being removed from mechanical ventilation. If the patient demonstrates stability with a demonstration of improvement signs or a reversal of the initial condition that raised the necessity for mechanical ventilation this calls for the assessment of weaning indices (Unoki, Serita, & Grap, 2008). These indices include maximum inspiratory rate, vital capacity, and tidal volume. Vital capacity refers to the air volume that is usually exhaled or inhaled mainly from the lungs in an effortless breathing.  Shallow breathing incorporates the breathing pattern assessment which is usually calculated by the division of respiratory level by the tidal capacity. The strength of the respiratory muscles is assessed using MIP which in normal context should contain H2O 20cm. when a patient holds breaths that are below 100 this is supposed to achieve successful weaning (Haberthür, et al., 2002). In addition stability of the arterial blood and vital signs are crucial successful weaning predictors.

Mechanical ventilation halting typically refers to two diverse but unswervingly related care aspects which are motorized ventilation discontinuation and false airway removal. The prime issue that is faced by clinicians is the mode of determining the readiness of the patient in resuming ventilation on self-abilities (Haberthür, et al., 2002). It has been demonstrated by a number of studies that the use of direct methodologies in evaluating the readiness in maintaining normal breathing is usually intended a trial to breathe that is not supported. After the patient has acquired the capability to maintain spontaneous breathing the second evaluation is then made to determine the appropriateness of artificial airways removal. These choices are customarily made in orientation to the psychological status of the persevering, their protecting airway instruments, and the proficiency to a cough and emissions character. Given that the patient has acquired enough sensorium with airway protection that is unbroken without excess secretion this creates reasonable grounds to trachea extubation (Haberthür, et al., 2002).

            Predictive Mechanical Weaning Criteria

Weaning procedures begin normally under the existing illness procedure that led to the need for ventilation support has been solved or improved. This infers that the patient should have realized adequate connections of gases a condition that is described as the division of arterial oxygen and the enthused oxygen fraction level upstairs 200 and suitable muscular strength status, and circulatory function constancy (Haberthür, et al., 2002). A number of health limits that are grounded of respiratory mechanisms, breathing patterns and exchanges of gases have been established as useful weaning outcome predictors that would help in offering clinical guidance in establishing the optimal period of mechanical ventilation discontinuation. However, in this context, the prime issue is the usefulness of shallow the-rapid breathing in distinguishing amid those patients that will or not wean efficiently. Weaning success possibilities prior to weaning attempt can mainly be estimated by knowledge physicians based on the setting. The post-test normally predicts the success by accounting for the diagnostic test results such as shallow breathing measures (Haberthür, et al., 2002).

SBT/Extubation Protocol and AM Bed Huddle Effectiveness

After patients have been considered stable and ready to engage in mechanical weaning the best approach is assessing the ability of the patient in breathing based on their own abilities which can be conducted through the conduction of spontaneous ventilation trials (Glossop, Shepherd, Bryden, & Mills, 2012). After the accomplishment of spontaneous breathing tests, instantaneous extubation accelerates weaning and typically decreases the mechanical ventilation duration when being equated with gradual ventilatory sustenance termination. Based on the recent studies it has been demonstrating that approximately 60 to 80 percent of patients under mechanical ventilation can be extubated successfully after they have passed the spontaneous breathing tests. It is apparent that there is minimized reduced risk in conducting closely observed spontaneous breathing tests in those patients whom the acute failure of the respiration can be removed while achieving cardiovascularly stability so that the capability of sustaining effortless breathing can be evaluated (Glossop, Shepherd, Bryden, & Mills, 2012). When patients retain their clinical stability without any signs of inappropriate tolerance till the trials have been completed, tracheal tubes should be removed immediately. However, if the respective patients acquire poor tolerance signs the waning procedure is then categorized as a failed one thus requiring mechanical ventilation reinstitution.

Weaning trails that are categorized as inefficient normally indicate incomprehensive illness resolution that precipitates mechanical ventilation need or the rise of fresh issues. Weaning failure is attributed to the creation of imbalances amid loads that are faced by neuromuscular and respiratory muscles competence if the strength balance and all the acquired loads cannot be balanced adequately achieving effortless breathing might not be productive (Glossop, Shepherd, Bryden, & Mills, 2012).

An illustrative instance on how differing forces can result in ventilatory needs and the capacity of respiratory imbalance is that of critically hyper inflated persons. In this category, inspiratory muscles loads are usually increased for several reasons (Pearl, 2014). To begin with, airway obstruction and hyperinflation tidal breathes that happens in higher pressure capacity lung curve which increases the loads furthers. Hyperinflation is common in COPD patients and would thus play a significant role in weaning failure thus the need to consider PEEP measurements in all the COPDs who fail the weaning procedures (Pearl, 2014). With the understanding of the detrimental implications of PEEP in raising loads, all the efforts should mainly be targeted at lowering it. Airway impediment severity lessening should be dropped by the minimization of treatment, aperture setting adjustment in the establishment of more time in completing complaint occurrence while cultivating tolerance size to effortless conscious through work stimulation lessening by an addition of peripheral PEEP which is the most operative healing health interventions. PEEP addition does not lead to additional hyperinflation or it does not affect the gases exchange rates (Pearl, 2014).

Criteria for Determining Weaning From Mechanical Ventilation Success

Regardless of the weaning approach that has been utilized physicians are required to determine weaning success. Despite the fact that mechanical ventilation has grown to be a life-saving advancement it is inevitable to create decisions on weaning patients from the ventilatory support which normally necessitates the skillful incorporation of technology, teamwork, knowledge as well as proven protocols (Pearl, 2014). Mechanical ventilation weaning can be categorized as central to critically ill individual’s management. Decreased or necessitated prolonged procedural weaning raises ICU to stay duration thus raising costs, reducing beds obtainability which can affect the outcome of patients in general. Mechanical ventilation process discontinuation of challenging and it is completed in a number of stages.

To begin with, patients are required to have recovered adequately from critical imbalances in reference to physiology which resulted in the complication of their critical ailing session so that the weaning commencement can be considered (Balas, et al., 2012). Second, the patient is supposed to be involved in progressive ventilator support reduction until the time when they are able to breathe effortlessly is acquired. Third, disconnection of the patient from extubated, ventilator should be done so that effortless breathing can be achieved. A number of strategies ate also utilized in determining those that suits weaning and the modes through which they can be managed throughout the process. The weaning success criteria should be a simplified one with the easiness of data collection with low-cost insignificances to predict extubation and subsequent weaning success. These criteria are set based on the general needs of the patients to facilitate the acquisition of success in general without creating any form hindrances (Balas, et al., 2012).

Weaning readiness is usually determined by several factors. First, the support must have been able to improve the probable cause that resulted in respiratory failure. This, therefore, means that the illness must have been established, improved or even resolved from the previous critical condition. The procedure in addition must have been able to achieve the absence of the major failure of organs which might affect the individual’s capability to breath without the application of many efforts. Third, the appropriate oxygenation level should be achieved within prior to the removal. This is to ensure that the patient is able to oxygenate the blood flow to provide adequate strength to all the muscles (Balas, et al., 2012). The other requirement is having an adequate ventilatory level which will enable the body to function adequately. In addition, an additional aspect that is necessary for extubation is intact protective airway mechanisms. Ventilatory drive that is adequate for the body refers to the general capability of controlling self-ventilation level. In addition, this is the required conscious level that demonstrates cooperation gag and cough reflex intactness and respiratory muscles that are functions. This implies to the general capability of supporting effective and strong coughs and retaining normal breathing (Pearl, 2014).

Mechanical ventilation weaning necessitates patient’s preparation, readiness evaluation in determining independent breathing and extubation. In addition, a brief test of breathing that holds low assistance is to be conducted (Balas, et al., 2012). This should, therefore, be conducted in a gradual or abrupt withdrawal of the desired pressure in reference to the readiness of the patient. The extubation criteria can, therefore, be stated as first the capability to protecting the upper airway effectively with minimal support, effective cough, consciousness or alertness in regard to the happening in the particular setting, clinical condition improvement, and enough larynx and trachea adequate lumen. This can be evaluated through the use of leak test during the pressurization of the airway with a deflated cuff (Balas, et al., 2012).

            Weaning Protocol and ABCDE Bundle for Weaning

Despite the fact that most of the technology advancement in the health profession in the recent decades it is apparent that mechanical ventilation still remains to be the most complex in the sector.  Mechanical ventilation weaning or liberation creates more challenges that necessitates excellent evaluation skills and practical competence while utilizing the machines (Balas, et al., 2012). While in most cases making the health provision more effective through safer ventilation as well as weaning facilitation the same advancement, in addition, makes success the hardest thing to achieve since these additional developments, in addition, offers more respiratory therapy options. In most scenarios, the fresh technological models have never been justified being more efficient when compared to the conventional modes. However, it can never be denied that they have resulted in weaning procedures simplification as they design patient-centered critical settings. Most health care procedures are simplified via the use of acronyms for easy understanding and convenience. This is an approach that normally reminds practitioners of the most appropriate procedural stages like circulation, breathing, defibrillation and airway in the general cardiac support which is denoted as ABCD (Balas, et al., 2012). The acronym can be utilized in the ventilator mechanical weaning protocol with the addition of a few words.

ABCDE bundle is best described as the coordinated efforts amid a number of management disciplines attending to the patients who are critically ill. The utilization of the approach is normally aimed at lowering immobility, over sedation and delirium development of all that harms the wellness of the patient (Balas, et al., 2012). ABCDE bundle is utilized in the representation of a guide that is based on evidence which is utilized mainly by clinicians in the approach of all changes within the organization so that ICU patient outcomes and recovery can be optimized. The bundle usually incorporate Assessing, prevention, pain management spontaneous awakening and breathing trial and choice of sedation and analgesia. ABCDE bundle usually contributes to weaning ventilation, delirium management as well as early ICU ambulation (Balas, et al., 2012). In that, the bundle usually facilitates all registered nurses, respiratory therapists, and physicians in working together so that the outcome of lowering complications related to ICU can be reduced. Ventilator Weaning normally occurs rather faster since patients are likely to get over-sedated and this results in the reduction of the general ventilatory stay and the associated complexities. Based on research it is indicated that Delirium stays for about for a yearlong after the discharge from hospital can thus be lowered by the identification of those that develop it and managing it aggressively with the adjustment of medications and the caring plan. The earliest ambulation ABCDEF bundle portion is a procedure that incorporates 6 steps that begin as early as the first hospitalization day and continues until the ambulation of critically ill patients even for the ventilated ones. This results in the reduction of muscle wasting thus decreasing the ventilatory period (Truwit, 2011). ABCDEF bundle does not only seek to reduce they general period rate that is utilized under mechanical ventilation but additionally lowers the general death level, and ensures that pneumonia that is associated with ventilatory support are also eliminated which results in successful weaning.

These letters are a representation of the most practical and significant forces that must be accounted for during, prior and post-weaning including extubation processes. ABCDE is a useful model for the simplification of the entire weaning procedure in association with weaning guidelines grounded on evidence (Truwit, 2011). Weaning process cannot be effective without ensuring that all the processes that involve frequent evaluation of the patient which should incorporate a continuous patient’s reevaluation general medical administration on the grounds that these aspects might impact the dependency of ventilatory support. Ventilatory support should be objected and increasing comfort while unloading the involved respiratory muscles. In cases that patients necessitate prolonged support, they should be directed to special facilities that seek to offer gradual support reduction (Truwit, 2011).

The weaning assessment procedure should include gas exchange adequacy, circulation stability and the general ability in initiating inspiratory or breathing effort. In addition, the assessment should also evaluate Airways before being extubated (Truwit, 2011). It is apparent based on recent literature weaning that not offer any guarantee of extubation success as it would be agreed by many that the prime intention is to proceed with successful extubation post weaning. Given that compromised airways would mainly result in weaning attempt failure airway assessments should be incorporated into the weaning protocol in avoiding prolonged ventilation.  Tracheostomy consideration in the early stages of the process is both reasonable and beneficial given that it expedites weaning which results in the reduction of mortality, illness as well as costs in general that are linked mainly with mechanical ventilation assistance (Truwit, 2011).

Weaning Protocol Outline

  1. Some reversal evidence of the existing respiratory failure cause
  2. Adequate oxygenation
  3. The hemodynamic stability which is described by active myocardial absence and the absence of important clinical hypotension. This is a health situation that necessitates vasopressor therapy.
  4. The ability to initiate inspiratory effort including the capability to cough and supporting unsupported breathe with reduced efforts.

Weaning protocol should be safe and effective given that delayed and premature weaning may lead to unintended harm (Truwit, 2011). Additionally, a protocol should be a reflection of the standardized approaches that seeks to liberate patients from mechanical ventilation in improving care continuity as well as the reduction of mortality, illness as well as all the linked costs. Given that standardized protocols might fail to demonstrate effectiveness in all the given cases properly designed, patient-centered protocols can be effective in liberating all patients in about 60 to 70 percent of all the given cases based on most studies (Truwit, 2011). In ensuring successful mechanical ventilation weaning an initial evaluation of the four prime criteria aspects outlined above are to be accounted in the protocol given that it offers the most appropriate weaning readiness evidence.

With respect to ABCDEF model, the logical queries regarding ever letter should be reflected. (A) Refers to the basement is aimed at evaluating the intactness nature of airway to determine whether the results states that any weaning should be conducted (Balas, et al., 2012). On the other hand (B) which represents breathing seeks to ensure that a patient holds the capability of initiating self-effortless breathing. (C) Stands for hemodynamic stability and therefore the stability of the cardiovascular should be assessed (Balas, et al., 2012). (D) Reflects on diffusion which seeks to establish whether the existing respiratory failed issue can be stabilized or resolved. In that, this should establish whether the gas exchanges is one that is adequate and that the patient does not necessitates much effort (Balas, et al., 2012). If all the affirmative logics can be justified then this implies that the next weaning stage can be initiated but for most practitioners, a number of conventional limits must be accessed for the procedure to be grounded as effective.

Pro/Con Ethics Debate

Morally the debate can contribute in the development of firm practices and policies in regard to offering Ventilation and weaning care to critically ill patients. In addition this will result in the development of knowledge and increased abilities and weaning simplicity. However, the information and the proposed protocol might complicate some of the adopted strategies. SBT should be conducted on regular basis in ensuring that the patient’s capability has been assessed. In addition, this will seek to initiate pressure reduction to create more opportunities for the patients in breathing individually (Balas, et al., 2012). This approach helps in strengthen the respiratory muscles and increasing the general gases exchange rates. In that in order for the adults to be liberated from the support they must demonstrate their general capabilities of breathing with minimal support. SBT seeks to ensure that the most suitable care is provided since respiratory support can never be withdrawn one given that it is a continuing procedure. During all the SBTs comfort and tolerance capability of the patients should be accessed while utilizing the ABCDE model. If the patients have the capability of tolerating SBT for above 30 minutes this would imply that permanent ventilator discontinuation, as well as extubation, should be considered (Balas, et al., 2012). With the presence of uncertainty, the trails can be extended up to 2 minutes and stopped after all the criteria have been achieved. The model offers weaning simplicity during the conduction of all the clinical evaluations. In addition, patient’s wellness safety, as well as the accuracy of the weaning procedure, is also ensured. Actually, the use of well-structured protocols is useful in the liberation of patient’s majority while developing care continuity and decreasing costs, deaths and illnesses linked to mechanical ventilation (Truwit, 2011).

Conclusion

Daily spontaneous breathing tests for patients under mechanical ventilation with the objective of establishing those with the capability of effortless breathing is regarded as the most suitable approach in lowering the ventilatory support period. SIMV is known to be the most incapable approach in weaning adult patients with respiratory failure. With respect to the utilization of pressure support, clinicians are to select the approach that they feel to be best based on the patient’s respiratory needs and the approach should be customized in meeting the identified needs. Spontaneous breathing daily trials use for those patients that are difficult-to-wean should mainly be applied. This is because it results in extubation which is double effective when compared to PSV. It normally simplified care management given that the capability of the patients to breathe effortlessly without the support of ventilators requires daily evaluation. This permits a rather prolonged resting period which can be noted to be the most effective approach in increasing muscle recovery adequate timing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

            ReferencesTop of Form

Bottom of Form

Balas, M. C., Rice, M., Chaperon, C., Smith, H., Disbot, M., & Fuchs, B. (2012). Management of Delirium in Critically Ill Older Adults. Critical Care Nurse, 32(4), 15-26. Doi: 10.4037/ccn2012480

Balas, M. C., Vasilevskis, E. E., Burke, W. J., Boehm, L., Pun, B. T., Olsen, K. M., & ... Ely, E. W. (2012). Critical Care Nurses' Role in Implementing the "ABCDE Bundle" Into Practice. Critical Care Nurse, 32(2), 35-48. Doi: 10.4037/ccn2012229

Chang, D. W. (2014). Clinical application of mechanical ventilation. Cengage Learning.

Ching-Ju, C., Chouh-Jiaun, L., Ya-Ling, T., & Ling-Nu, H. (2009). Successful Mechanical Ventilation Weaning Experiences at Respiratory Care Centers. Journal of Nursing Research (Taiwan Nurses Association), 17(2), 93-101.

Esquinas, A. M. (2016). Noninvasive mechanical ventilation and difficult weaning in critical care: Key topics and practical approaches.

Glossop, A. J., Shepherd, N., Bryden, D. C., & Mills, G. H. (2012). Non-invasive ventilation for weaning, avoiding reintubation after extubation and in the postoperative period: a meta-analysis. BJA: The British Journal of Anaesthesia, 109(3), 305-314.

  1. Silverman, M. Stanchina, A. Vieillard-Baron, T. Welte. (2007). Weaning from mechanical ventilation. ERS Journals, Pp. 1033–1056 DOI: 10.1183/09031936.00010206

Haberthür, C., Mols, G., Elsasser, S., Bingisser, R., Stocker, R., & Guttmann, J. (2002). Extubation after breathing trials with automatic tube compensation, T-tube, or pressure support ventilation. Acta Anaesthesiologica Scandinavica, 46(8), 973-979. doi:10.1034/j.1399-6576.2002.460808.x

Herlihy, J. P., Koch, S. M., Jackson, R., & Nora, H. (2006). Course of Weaning from Prolonged Mechanical Ventilation after Cardiac Surgery. Texas Heart Institute Journal, 33(2), 122-129.

J-M. Boles, J. Bion, A. Connors, M. Herridge, B. Marsh, C. Melote, R. Pearl,

Kreit, J. W. (2013). Mechanical ventilation. New York: Oxford University Press.

Kreit, J. W. (2013). Mechanical ventilation. New York: Oxford University Press.

Montagnani, G., Vagheggini, G., Vlad, E. P., Berrighi, D., Pantani, L., & Ambrosino, N. (2011). Use of the Functional Independence Measure in People for Whom Weaning From Mechanical Ventilation Is Difficult. Physical Therapy, 91(7), 1109-1115. doi:10.2522/ptj.20100369

Papadakos, P., & Dooley, J. (2007). Mechanical ventilation. Elsevier Health Sciences.

Pearl, R. G. (2014). Review: Noninvasive vs. invasive weaning from mechanical ventilation reduces mortality in respiratory failure. Annals of Internal Medicine, 160(12), JC8.

Slutsky, A. S., & Brochard, L. (2005). Mechanical ventilation. New York: Springer.

Truwit, J. D. (2011). A practical guide to mechanical ventilation. Chichester: John Wiley.

Unoki, T., Serita, A., & Grap, M. J. (2008). Automatic Tube Compensation during Weaning From Mechanical Ventilation Evidence and Clinical Implications. Critical Care Nurse, 28(4), 34-43.

Vincent, J. L. (2011). Textbook of critical care. Philadelphia, PA: Elsevier/Saunders.

Waldmann, C., Soni, N., & Rhodes, A. (2008). Oxford desk reference. Oxford: Oxford University Press.

 

 

Outline

Weaning From Mechanical Ventilation for Adult Patient

            Abstract

            Weaning normally incorporate the complete procedure of the general liberation of the patient from mechanical support as well as from the endotracheal tubes. Given that mechanical ventilation weaning normally incurs significant costs, mortality and illness and also untimely and delayed extubation can result in harm weaning that can be categorized as safe and speedy is highly required. There are controversial concerns in regard to the best approach that should be utilized in the conduction of the mechanical weaning procedure. Weaning can be fastened by the use of SBT and every day’s screening of the functioning of the respiratory.  Respiratory rate can be categorized as the best successful weaning predictor. The utilization of now- aggressive ventilation models might be useful in improving the general outcome of a number of patients who might acquire respiratory failures during the extubation process. The study established that weaning should be considered the earliest possible. In addition SBT is the prime diagnostic test in the determination of whether extubation would be successful. Non-aggressive ventilation approaches should be utilized in shortening the intubation period but should thus not be utilized as often tools in reference to extubation failure. In achieving the study’s success the study utilized a systematic review approach to the recent evidence-based studies.

            Introduction

            Weaning from Mechanical Ventilation is best described as the general gradual procedures for withdrawing ventilatory sustenance. Close to 800,000 adult patients necessitate the support of mechanical ventilation every year (Chang, 2014). Undoubtedly this is an existence saving intervention but it is one of the approaches that are uptight with the probability of iatrogenesis particularly if the support is utilized extensively than the required period. Based on scientific estimations 90 percent of the critically ill adult patients require the support of mechanical ventilation and while acquiring the support the patients are amid the weaning procedures which account for approximately 40 percent of the general time (Chang, 2014).

Literature Review

  • Mechanical ventilation overview
  • Respiratory Weaning
  • Mechanical Ventilator Weaning issues
  • Predictive Mechanical Weaning Criteria
  • SBT/Extubation Protocol and AM Bed Huddle Effectiveness
  • Criteria for Determining Weaning From Mechanical Ventilation Success

Project Protocol Elements

  1. Some reversal evidence of the existing respiratory failure cause
  2. Adequate oxygenation
  3. Hemodynamic stability which is described by active myocardial absence and the absence of important clinical hypotension. This is a health situation that necessitates vasopressor therapy.
  4. The ability of initiating inspiratory effort including the capability to cough and supporting unsupported breathe with reduced efforts.

            ABCDE Bundle in Mechanical Ventilation

            ABCDEF bundle is best described as the coordinated efforts amid a number of management disciplines attending to the patients who are critically ill. The utilization of the approach is normally aimed at lowering immobility, over sedation and delirium development of all that harms the wellness of the patient (Balas, et al., 2012).

Pro/Con Ethics Debate

Morally the debate can contribute in the development of firm practices and policies in regard to offering Ventilation and weaning care to critically ill patients. In addition this will result in the development of knowledge and increased abilities and weaning simplicity. However, the information and the proposed protocol might complicate some of the adopted strategies.

            Conclusion

            Daily spontaneous breathing tests for patients under mechanical ventilation with the objective of establishing those with the capability of effortless breathing is regarded as the most suitable approach in lowering the ventilatory support period. SBT/extubation protocol and AM bed huddle are effective in decreasing the time to extubation from when an individual passes SAT/SBT AM bed huddle. ABCDE model is useful in decreasing mechanical ventilation duration.

 

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Autism special program

Autism Society of America was established in the year 1965 by a man named Rimland Bernard. In late 1968, Sullivan became the president of the society as an organization that involves human relations. Over the past more than four decades, the organization has developed from just involving the parents to being a leading source of vital information, reference, research, and supporting the autism spectrum. This organization is the oldest and also the largest organization from the grassroots with the community of autism (Nichter & Edmonson, 2005). The organization begun as an advocate in 1969 to being a joint commission for mental health for the children and also played a central role in the legislative efforts like section 504 on development disability acts, campaigning for an increased autism, educating all the handicapped children and much more. Autism Society has always engaged in the systematic difference which has a real impact on the lives of many people. A nationwide campaign by the Autism Society started in the early 1970s and was adopted by the Congress in the year 1984. This move made the society to grow stronger and even caused the release of an awareness ribbon in the year 1999. In 1976, autism society established a foundation that was really into applied research (Gelbar et al., 2014). By law, the program requires that a single or both the parents must be present at any meeting that involves their child who is physically or mentally impaired, teacher or caretaker of the child must at all times be available for any decision making meetings. There has to be a representative of the public agency at the place of any meeting that involves the individual education planning (IEP).

Individuals who have the autism spectrum disorders (ASD) disorders can suffer from developmental impairments such as the social, physical and behavioral issues. People who are known to develop the ASD issues start to display some unusual acts, impaired non-verbal and verbal communication, and paying attention to unnecessary things (Gelbar et al., 2014). Victims of autism start to develop physical ailments like digestive disorders, persistent infections, asthma, and epilepsy. Symptoms and signs of the autism disorder start before the age of three years and can continue for life. ASD can occur in any ethnic, race, and the socioeconomic categories and the highest possibility of occurrence are to boys than to girls.

Autism Society program is very important in schools today as it creates the awareness, inclusion, and acceptance of every child. The main ideology is for every member of the society especially the kids to feel welcomed in the society they live in even with the disability. The educational planning for the children with disability in schools mainly addresses skill development inclusive of the academic considerations such as communication, social skills, behavioral skills, leisure related skills and language development (Wong et al., 2015). It is always recommended that a person should seek a professional guidance especially when it involves autism in order to assist the children to get the best from the autism society program.

The autism society program is mainly intended for the parents but it has its focus on all generations since the main point of the program is to get as many people as possible to feel accepted and part of the larger society. Parents are targeted in the actual sense since they are the most affected by this issue. Once a parent has discovered that the child has an issue or certain symptoms, many of them try to shy away but the program encourages them to come forward and receive the help and assistance they need in making their children have a good life. Without such a program many children could die or get into much more challenging life situations. Currently, the program focuses on individual child meaning that in the event there are two or more suffering from autism, they cannot share the program at any one given time (Nichter & Edmonson, 2005).

The program is being used according to how it is required since the guidelines are followed keenly to ensure that there are no missed steps in the schedule. One program cannot be shared amongst two children and so this is observed with seriousness in every way. According to the individuals with disabilities improvement acts (IDEIA) of 2004, now the parents were to be included in the programs of any group of people who make the decisions on educational strategies and routines of the child. In the development of an individualized educational planning (IEP), the members and the parents of the children always meet to make conclusive and result-oriented plans and schedule for their children. The children and the guardian are expected to complete the individual educational planning and this is done considering whether the parent is around or away meaning that the program is followed effectively (Wong et al., 2015). A number of pages in the IEP must be filled in duly and this is done without failure.

Many of the parents who have their children suffering from autism start getting so committed to their daily routines in ways that make them forget the future of their children and planning is very important especially at this stage. The future of such a condition arrives soon when the parents and the guardian have not planned for it. To take care of a person and especially a young child, quality life is very important financially and legally in order o eradicates the issues that are caused by lack of proper planning. Special needs are required in order to plan and ensure that there is economic security for the children. The future of the autism society program is to continue offering the world with a way in which the children can be comfortable and feel as members of the society (Nichter & Edmonson, 2005). The society has a future of working in a network that will improve the living status of people who have been affected by the autism. Increasing the awareness to the public on the issues that are faced by the people with autism is a strategy that allows a common man to be free with life situations. The program continues to campaign for appropriate and adequate services for the people who are living with or affected by the autism condition. With the research that it carries out on how to make autism disappear forever, the organization continues to share any information with others for quality treatment, education, advocacy, and research.

At school, the program faces a lot of challenges especially in classes where there are lots of noises and the children with autism are present (Gelbar et al., 2014). Children with these disabilities occasionally undergo certain challenges through their daily lives like feeling nausea in any group setting. The program does not recommend a child to be amongst other children when maybe eating since the different aromas can be hard on the spectrum, therefore, adding more challenges than there were before. To be in such a place it requires a lot of sacrifice and degree to socialize but for the small children, this can be a challenge. Stress levels for the child can be very high causing the child with autism to panic in the event and since the settings nature do not allow one to be free, talking it out might be very difficult. This may delay the time expected to get help from the outside, therefore, causing the impairment to become worse. The children with the conditions can be isolated at times and allowed to choose what they feel is comfortable with them. During the times when there are group works, then selective methods should be used to ensure that the child is free and does not have any disturbing smell or issue with the group mates (Wong et al., 2015). Allowing the children to have some time out of the norm is helpful as they will not have to be at the same time for long hours and therefore eliminates anxiety.

The society and the management at schools including the court recognize the idea that children with a disability also have the right to have the education that is free and quality. The rights to having quality education can in the current times not be an issue in the world but the specifics on how to offer such services to the children according to the programs is the main issue (Nichter & Edmonson, 2005). Autism Society program recommends ways in which this can be obtained and allow the children to have the best type of education through the individual educational planning system. Strictness should be observed at all times for quality results according to the guidelines.

 

 

 

 

 

 

 

 

 

 

References

Gelbar, N. W., Smith, I., & Reichow, B. (2014). Systematic review of articles describing experience and supports of individuals with autism enrolled in college and university programs. Journal of autism and developmental disorders44(10), 2593-2601.    

Nichter, M., & Edmonson, S. L. (2005). Counseling services for special education students. Journal of Professional Counseling, Practice, Theory, & Research33(2), 50.

Wong, C., Odom, S. L., Hume, K. A., Cox, A. W., Fettig, A., Kucharczyk, S., ... & Schultz, T. R. (2015). Evidence-based practices for children, youth, and young adults with autism spectrum disorder: A comprehensive review. Journal of Autism and Developmental Disorders45(7), 1951-1966.

    

1554 Words  5 Pages

Urban Affairs issue: Healthcare (Obama Care repeal)

Problem

Obamacare or Afford Care Act (ACA) is a health policy in U.S which was passed on March 2010 for the purpose of providing Americans with essential health services, affordable and quality health insurance. President Barack Obama focused on provision of quality care and health insurance coverage regardless of race, ethnicity and disability, and ensured the prevention of chronic diseases (Stack, 2016). However, ACA is a controversial issue in that the Republicans have created the agenda on repealing the ACA and they have created a slogan ‘Repeal and Replace’ (Stack, 2016).  The big problem with the Republican is that they do not have an alternative while majority of American people argue that there should be no repealing without replacement. The problem with ACA arises since opponents argue the law on ACA is a ‘job killer’ and imposes high costs on business. Private businesses do not benefit from the insurance coverage and indeed, they view it as an unwarranted intrusion. Other problem is that since ACA is constitutional, states were forced to modify the programs on Medicaid and the federal government was required to add more funding to the State to enable them increase the number of people entitled to receive Medicaid (Stack, 2016). However, the court rules out the States may cease to provide Medicaid expansion and this is an indication that poor people were enforced to engage in private insurance. Insurance companies are experiencing a challenge in that fewer Americans are signing up and this is an indication that insurances costs are high and this continues to discourage people from participating. ACA subsidies are few and failure to sign in raises higher fines and discourages middle-income American from enrolling in plans (Stack, 2016). Other problem with ACA is that premiums and government subsidies will increase   but the subsidies are not provided to Medicaid members.  

            The history of Obamacare helps us understand why it has failed. ACA is a debatable issue in political arena and in 2009 when the debate on legislation was high, Republicans were unified to resist and Democratic were unified to support it. In the Supreme Court, the law was changed through Medicaid expansion to cover the disabled and the poor people. The coverage expansion was also aimed to include the middle and lower workers (Stack, 2016. However, in 2014, health insurance exchanges become a heavy burden to insurers. The debate on ACA started back in 20th century when Americans presidents Theodore and Clinton showed their effort in implementing health insurance program though they failed.  Medicaid was enacted in 1960s by President Lyndon for the purpose of providing health insurance to the old and disabled Americans (Stack, 2016. Children and families health insurance was also passed in 1997. In 2003, Medicaid programs were expanded to include the drug coverage. The major problem as to why America lacks a single payer system is due to capitalism. The latter is associated with government intrusion and both have contributed to problem of ACA.

Issues

Majority of Americans are involved in the intense national debate since they believe that the Obamacare is irreparably flawed.  Opponents offer arguable points that ACA has contributed to several negative issues such as high cost for business and families, high taxation on middle-class and excessive spending on health care, unanticipated consequences among many other issues which will be discussed   in the paper (Lichtenstein, 2017).  The partisan process was successive in the creation of ACA and  majority supported the law. However, survey data showed that after the enactment of the law, 39% favored the ACA while 49.3% were opponents. The issue raised was that even though the healthcare is affordable, majority of family pay 35% for healthcare.  Individuals and business are experiencing the challenges of higher health care costs. Even though premiums have increased, individuals are not protected by previous coverage (Lichtenstein, 2017). ACA’s administration pose challenges to families and individuals and many of the problems are as a result of increasing costs of quality care, financing and more. Even though the ACA’s administration promised Medicaid expansion and additional enrollees, the expansion of Medicaid is still a substandard. The  functionality of the  main provisions  present some issues in that initially, the  ACA had ambitious agenda but  the  approaches used in  solving  problems have been ineffective. Problems arose in 2013 when the federal government introduced health insurance exchanges websites and this revealed operational problems and managerial failure. For example, there were managerial failures which were related with ineffective leadership, poor decision making and poor project tasks (Lichtenstein, 2017). The federal websites lacked effective management and as result, there was a flawed arrangement based on dealing coverage exclusion, there were high   health insurance costs and the overall process of insurance subsidies was complex. The ACA is flawed in that the subsidy programs are not administrated effectively since enrolment on subsidy is measured by eligibility, income, family size and residency. Problems have been encountered by low-income enrollees in that there is inconsistence of data and fraud. In addition, there are unprecedented mandates in that in 2014, American cities were forced to sign in and purchase health coverage but the Obama administration was reluctant and showed exemptions and delays. Due to multiplying exemptions and failure of the administration to delay penalty provisions, out of 30million uninsured, 90% were not fined (Lichtenstein, 2017). In discussing the issue, it is important to understand that ACA is the root cause of centralized power which affects the efficiency and effectiveness of federal government. The problem with centralized power as related with economy is that it will be difficult to poses requisite knowledge which also makes it difficult to gain cost and quality.  The key point which everyone should get from issues contributed by ACA is that families and business are negatively impacted in that the high insurance costs are a   heavy burden to them.  Despite the fact that president promised premiums increase by 10% 13%, there was a premium rate shock in 2014 (Lichtenstein, 2017). The latter led to the out-of pocket costs which are made by premiums and deductibles.  For example, low cost premium plan moves together with higher deductibles and in this case, low middle-income workers are constrained when it comes to insurance choice.

 

Ponnuru (2017) asserts that repealing is ‘a risky Obamacare strategy’. For seven years now, Republic has not gained the power to repeal and replace the Obamacare. It is true to say that they have the power to repeal because huge support is coming from White House and house of Congress but they lack a strategic approach of making the repeal. The reason why there are some constraints in changing the Obamacare is that almost all Republic supports the end of ACA and they argue with philosophical and practical points of view.  The same people fear that the end of ACA will negatively impact them since they will lose the health coverage. There is also a conflict between the republics since they do not agree on ‘replacement system’ (Ponnuru, 2017). Some argue on implementing catastrophic-insurance policies while others argue on implementing existing government policy or add free market policy. It is important to understand that repealing Obamacare will contribute to disastrous effects. Many will be uninsured according to an estimation which showed that repealing will make 24.0 million to uninsured and 19.4% in the whole population will be uninsured in 2021(Ponnuru, 2017). If ACA will be repealed, Medicaid enrollment will decrease. Since the enactment of ACA, 52.6 million are covered by Medicaid and Health Insurance Program for children and if the enrollment continues, 69.3million will be enrolled by 2021. However, repealing will only enroll 14.5 million. A big effect will be on Insurance Coverage since enactment will increase the Uninsured. Economic Policy Institute sates that repealing will affect spending and taxes which will be approximately $109billiuon federal spending   cuts and $70billion taxes in 2019(Ponnuru, 2017). Both tax cuts and spending cuts will lead to economic damage where job growth will fall by 1.2 million in 2019.  Other point to note is that repealing will affect the purchasing power of working people, and this is an indication that local economy will be affected since people will spend less. Decrease in spending will reduce job growth and about 20million people will lose health insurance (Ponnuru, 2017).

 

 The Issue on Obamacare repeal has been addressed and the main solution which has been offered is related with ‘if ACA should be repealed, then there should be a replacement (GARLAND, 2017).  However, failure to replace will be a big challenge to the American people.  Furthermore, repeal and replace is not an effective method and it is irresponsible in that it will worsen the health care system. If repeal is done without replacement, there will be uncertainty and Republican must understand that insurance companies and Health Insurance Marketplace will increase the prices. In addressing the issue, the perception that has been used is that individuals and families should be allowed to make decision through a patient-centered system but ACA denies this system since it is strongly fixed on federal government system (GARLAND, 2017). The best solutions have been offered regarding the patient-centered system and to achieve the latter, Obamacare repeal should be implementing in order to allow people have personal ownership and gain free-market innovation. In addressing this issue, it has been found that the ACA is unaffordable and unworkable and so repeal will allow Americans control their health insurance and gain tax relief (GARLAND, 2017). However, the solutions offered in addressing the issue are not implemented since Republicans are in dilemma as they have not set healthy care structure. Current, the issue is on ‘repeal and delay’ and this is another serious issue which will lead to new problems.

 

Solutions

 First, it is important to understand that Obamacare is rooted from federal power which raises dependence on government, federal micromanagement and tax hikes. In repealing and replacement, individuals are interested with a better system which is able to provide reliable coverage and quality care. However, even though majority focus on repealing, this strategy is not enough since it does not include serious reforms and the few reforms will not address the financing health.  The solutions are identifying the root cause of problem and fix (Hathi & Kocher, 2017).This is because; the health-care system is effective in terms of medical innovation and majority of American people access advanced care which is supported by insurance arrangements. However, rising cost is a big challenge where government’s revenue is spent on economy rather than on health care and this has contributed to deficits and debts. Tax exclusion has also resulted to employer-purchased insurance which has hindered not only consumer market coverage but also cost and value. Now, the solution is developing an insurance reform through developing a ‘defined contribution’ (Hathi & Kocher, 2017). The latter means that assessing the financial health care system will be a key element in creating a market-based approach and allow consumers be cost-conscious. The government should also provide ‘premium support’ which allows consumers to have personal responsibility and individual mandate. To address the pre-existing condition, the federal government should promote individual insurance which will allow individuals to have affordable options. Reform should also correlate with States partnership (Hathi & Kocher, 2017). Under ACA, States embrace federally managed system which allows them to create new programs such as insurance exchange where they pose extra costs. The reform should encourage partnership and allow States adhere to national policy and unite in creating policy innovation, insurance-market reform and safety-net programs. Other reform should be related with employer-sponsored plans and address issues which have been brought by federal tax policy such as higher costs of health care, lack of secure coverage and transparency in financing, discrimination and favoritism. To address this, there should standard tax credit which provides choice for coverage (Hathi & Kocher, 2017). This approach will also develop consumer control and allow them to have control in the health-care marketplace.  Finally, reform should be done on Medicaid since it does not provide high-quality coverage. Medicaid has also resulted to lack of quality health care especially the lower-income people. To address this, individuals should be provided with private health-insurances and this will enable them access quality care (Hathi & Kocher, 2017).

Recommendation

Thus, the best approach is to fix some weaknesses in the health care system and the big challenge to consider is the rising costs (DRUM, 2017). Majorities are unable to pay insurance and government is experiencing challenges due to high budgets. The Medicare is flawed due to its inefficiency and overuse and its effect on economy. Tax exclusion is another problem especially on workers’ taxable income, and this later affects the consumer market. Generally, the big problem which needs to be fixed rather than repealing is cost explosion. In other words, there should be ‘insurance reform’ and this reform will cover all the uninsured, will address the issue of costs explosion and address the insurance coverage on pre-existing conditions (DRUM, 2017).  Note that cost-cutting innovations will lead to new structure of health system and there will be strong financial incentives and highly competitive market place, thereby increase productivity and quality of care. The role of public administration on this reform is to make effective decisions based on provision of quality services. For example, on the issue of controlling cost, professionals of healthcare administration will create health programs and develop strategic planning of government services. It is their role and accountability to bring a systematic improvement on financial, access and quality (DRUM, 2017).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference

Stack, S. J. (2016). Health Care Reform in the United States: Past, Present and Future Challenges. World

Medical Journal, 62(4), 153-157.

 

Hathi, S., & Kocher, B. (2017). The Right Way to Reform Health Care. Foreign Affairs, 96(4), 17-25.

 

PONNURU, R. (2017). A Risky Obamacare Strategy. National Review, 69(2), 16-18.

 

DRUM, K. (2017). Here's How to Save Obamacare. Mother Jones, 42(1), 19-21.

 

GARLAND, S. B. (2017). The Impact on Medicare of ACA Repeal. Kiplinger's Retirement Report, 24(3), 14-

15.

Lichtenstein, N. (2017). Who Killed Obamacare?. Dissent (00123846), 64(2), 121-129.

2352 Words  8 Pages

States Strategies

Maryland All-Payer Model

 The creation of this innovation was enabled by 1971 Maryland legislature act, and through which a Health Services Cost Review Commission (HSCRC) was established with various responsibilities relating to public disclosure of financial information of hospitals and even trustee relationships. This commission was given the mandate to set rates for hospital payments affecting all payers. The implementation of this system was driven by the need to address the rapid rise in hospital costs and risk of insolvency faced by many non-paying patients (Consumers Union, 2015). Hence, those patients who depend on these hospitals for healthcare were faced about to lose access to them.

 This system is enabled partly by a Medical waiver spanning 36 years, and Maryland is exempted from OPPS (Outpatient Prospective Payment System) and also from IPPS (Inpatient prospective Payment System) which accords it the authority to set payment rates for the health care services provided by hospitals. This waiver allows all the third parties to use the same rate while making payment .The expectations are that All-Payer Model can succeed in betterment of the health care provided while minimizing program expenditures among the residents of the State including the beneficiaries of CHIP, Medicaid and the Medicare (Center for Medicare & Medicaid Services, n.d).

 The system has been very effective in serving the purpose for which it was intended since its implementation. The state has been able to moderate the rise in costs for each hospital admission and has seen an improvement in financial stability among the various hospitals across the state. In addition, the state kept increase in costs for each service in the hospitals quite low in comparison to other states. Statistical data shows that the state has gone from 1967 26 % higher than national average to about 2 % lower as per 2007(Consumers Union, 2015).

Reference

Center for Medicare & Medicaid Services, (n.d). Maryland All-Payer Model. Retrieved from: https://innovation.cms.gov/initiatives/Maryland-All-Payer-Model/

Consumers Union, (2015).Hospital Rate Setting: Promising, but Challenging to Replicate. Retrieved from: http://www.healthcarevaluehub.org/files/7114/2669/9363/Research_Report_No._1.pdf

 

     

 

342 Words  1 Pages

State Hospitals

 For Jane Joe, the issues that led to her admission were the difficulties that the Assertive Community Treatment experienced connecting with her and getting her to stay on medication and the deterioration of her situation of her situation especially due to drunkenness. The refusal to take medication was a major problem which made her to remain seriously disorganized and forcing the health care providers to embark on involuntary medications (Radke & Goetz, n.d., 28). The major assessment that is needed for this situation is the medical cause or inherent personal problems that may have made Jane to refuse medication. The community seems to have offered their support for her but failed to bring her under control. Even with such social support there seems to be personal issues that might have led to her drunkenness and whose assessment would lead more light on the same. Jane needed treatments that would control the acute agitation episodes she portrayed even if it had to be done involuntarily (Radke & Goetz, n.d., 28). The treatment seemed to have worked for Jane as she was able take part in groups and even being integrated to the community. The management of the community worked very well for her so that she was able to manage her life after being discharged.

The case of Joe Doe shows neglect by the community around him that avoided him because of the behavior wrought by abuse of methamphetamine. Unlike Jane who the community tolerated her sleeping on door step, Joe had to break into a garage to find a sleeping place. The only way he was admitted to OSH was after he was found unfit to stand trial (Radke & Goetz, n.d., 29).  There various issues that might be assessed in this cause including community neglect, growing up in an abusive home where he had been adopted which made him to drop out of school and early drug indulgence. Unlike Jane who had the care of the community-based organization, Joe had none of it and his admission came after various incarcerations. The medications seem not to have worked for him, since he is barely able to participate in group treatment programs.   The treatment has not prepared him to be reintegrated into the community and even managing his own future. The community providers are quite skeptical and unlikely to embrace him and even his release is not likely to be released (Radke & Goetz, n.d., 29).  The management in the case of Joe seems has not had success in healing the psychological and social issues affecting the patient. Of more concern is lack of community empathy and willingness to walk through with Joe like Jane until substantial control is achieved.

The two admissions involved can only be compared in the role of medication in stabilizing and controlling both situations. Jane and Joe had to be undertaken through an involuntary medication only after their condition had deteriorated so that to control extreme agitation and violence.  For both individuals, psychiatric problems can be attributed to extreme substance abuse which makes them unfit in their own community and hence the admission for treatment. There seems to be deeper social issues that led to substance abuse , and the treatment methods seems not to address the core issues of this case. Unless the two individuals are placed under mandatory medication or hospital care, they cannot bring themselves to gaining control of their life and future.  Lack of resources is major problem as seen in the case of OSH.

The state psychiatric hospitals started out as a refuge for different people including the poor, mentally ill and having developmental disabilities. After they were placed under states’ management, they shaped their roles to serving individuals with persistent and serious mental illness. After deinstitutionalization in 20th century and with increased population growth, the hospitals failed to grow proportionately to increasing needs and previously deplorable conditions returned (Radke & Goetz, n.d., 28). Presently, these hospitals serve different groups of mental patients including the children, adults and the elderly. The role of these mental health systems also include admitting individuals for forensic commitments , and many acts as tertiary care facilities which both long-term and intermediate range patients (Radke & Goetz, n.d.,36).

The hospitals have faced various challenges ranging from clinical, administrative and financial. The clinical challenges relate to the culture such as the need to phase out the use seclusion and restrained as a health care procedure for psychiatric patients. The clinical challenges also stems from lack of positive care environment at home and even in jail due to increasing cases of violence and even homelessness, conditions that worsen this situation. There are also patients with chronic conditions in state hospitals that are poorly treated or are not treated at all. The administrative challenges are linked to the financial and resource woes facing the hospitals. The high cost of accessing medical care for the patients visiting the community hospitals is a major problem. Meeting the criteria set by the states means that few patients can benefit from the high expertise placed in the community hospitals. The community resources ended up being stretched to their maximum (Radke & Goetz, n.d.,42). A case in example is the present shortage of hospital beds in the psychiatric state hospitals which leads to immature discharge of the patients and end up being readmitted or incarcerated (Torrey,2016,1).  

References

 Radke, A., Goetz, R., (n.d). State Psychiatric Hospitals in the Twenty-First Century.  28-42

Torrey, E.F., (2016). A Dearth of Psychiatric Beds. 1

 

928 Words  3 Pages

Local Health Care Delivery System

Strengths and weaknesses of my local health care delivery system

            The department of Access to Allied Psychological Services (ATAPS) is after bringing proper access to primary mental health and it supports general practitioners to provide services people with mental illnesses. This department of health has various strengths and a number of weaknesses. It has attained a favorable geographical spread including in rural areas. It has assisted in facilitating the innovative service models for example introduction of telephone based CBT American Academy of (Orthopaedic Surgeons & In Pollack, 2018). It has also reinforced the development of local teamwork models such as GPs and psychiatrists. The department has also empowered targeting of particular groups for example the homeless people, the refugees and the indigenous population. It has also empowered the development of mental health programs by developing links at local levels for example drought initiatives. It has worked to secure employment in places where fulltime private practice may not be sustained. This department has also been supported nationally by the primary mental health care network.

            The department has also got its areas of weaknesses that need improvement. First and foremost, it is expensive when compared to quality access. It currently does not provide service delivery to the most needy. In urban areas especially, its services are simply duplicating better access services. There are no enough incentives to fund arrangements for efficiency. Quality assurance has been problematic in certain areas when it comes to selection and training of health professionals (Nwaogu, 2006). Therefore, amidst all the strengths and the achievements of ATAPS, it needs to improve in these specified areas of weakness so as to deliver perfectly quality service to the people.

Conclusion

Access to Allied Psychological Services is a department of health that has exposed communities to primary mental health. It has registered various achievement for instance reaching out to the minority such as the homeless, the refugees and it is widely spread in the rural areas. It has also empowered the establishment of various mental health programs and facilitated them. However it is required make several improvements in its areas of weakness so as to attain highest objective.

 

References

American Academy of Orthopaedic Surgeons,,& In Pollack, A. N. (2018). Community Health Paramedicine.

Nwaogu, P. O. (2006). Mental retardation: An African perspective. Gaborone, Botswana: Bay Pub.

 

390 Words  1 Pages

MGpart1

Article 1

            Neonatal abstinence syndrome (NAS)  is a problem caused by pharmacologic agents.  Newborns are mostly affected by this problem and it mainly occurs when pregnant women take harmful substances such as heroin and cocaine (MacMullen, Dulsk & Blobaum, 2014). Newborn displays various symptoms such as fever, poor feeding, sweating among many.  The problem is associated with possible complication such as premature birth, birth defects and more. The purpose of this article is to conduct systematic and critical review in order to determine evidence-based interventions toward this problem (MacMullen, Dulsk & Blobaum, 2014).

Systematic review

            Literature review was done   where 480 international classic artless not older than 10years were used.  In research, the key words were ‘nursing interventions’ neonates ‘neonatal syndrome’ and ‘substance withdraws system’ (MacMullen, Dulsk & Blobaum, 2014).  Findings were recorded in a table which contained title, author and abstract.  Note that most publication had observational studies which were taken from clinical trials.

 Systematic review results

Twenty journal articles offered supportive interventions such as swaddling, non-nutritive sucking and quiet environment.  Eleven articles recommended that neonatal who are not in drug therapy should prevent physiologic effects through comfort measures such as swaddling. Nine articles supported non-nutritive sucking, vestibular stimulation and   quiet environment. Other recommended interventions include supine position, music therapy, and rooming (MacMullen, Dulsk & Blobaum, 2014).

Article 2

 Nurses use venous access device to treat infant and children and to ensure the delivery of blood and nutrition to the body. However, evidence-based practice has shown that peripherally inserted central catheters (PICCs) are effective, safe and valuable than venous devices (WESTERGAARD, CLASSEN & WALTHER-LARSEN, 2013). This is because, the device has been used in neonatal populations and the outcomes are associated with high insertion success and less catheter complications.

Method and results

 Evidence-best practice was done through a literature search where the key term was ‘PICC and children’.  Relevant articles which conducted observation studies and clinical trials were used.  Conclusion was made by focusing on evidence-based recommendations. The results indicate that PICCs is used in hospitals and are associated with few preoperative risk and long-term complications (WESTERGAARD, CLASSEN & WALTHER-LARSEN, 2013).  .

 

 

Reference

MacMullen, N. J., Dulsk, L. A., & Blobaum, P. (2014). Evidence-Based Interventions For Neonatal

Abstinence Syndrome. Pediatric Nursing, 40(4), 165-203.

 

WESTERGAARD, B., CLASSEN, V., & WALTHER-LARSEN, S. (2013). Peripherally inserted central catheters

in infants and children - indications, techniques, complications and clinical

recommendations. Acta Anaesthesiologica Scandinavica, 57(3), 278-287.

doi:10.1111/aas.12024

 

 

 

405 Words  1 Pages

Article 1

Physiotherapists play a significant role in helping patients manage pain and facilitate recovery. This is a science-based profession and physiotherapists focus on managing long-term illnesses and improving functional status (Baidya, Acharya & Coppieters, 2016).  In Intensive Care Unit, physiotherapists play the role of positioning, limb exercise, trachea suctioning and more.  However, it is important to understand the level of evidence in physiotherapy. The purpose of this article is to evaluate the treatment skills and therapeutic intervention in ICU (Baidya, Acharya & Coppieters, 2016)..

Method

            A cross-sectional survey was used and   86 physiotherapists   working in ICU over 2 years and who were qualified with Certificate, Bachelor and Masters were  included.  Questionnaire was used together with reliability analysis. Physiotherapists’ were asked to answer the questions which were based on PT staffing, demographic in primary hospital, mechanically ventilated patients in ICU (Baidya,  Acharya  & Coppieters, 2016).. Statistical method were used where data collected was recorded in Microsoft Excel and descriptive statistics was used to summarize the data.  Chi-square test and ANOVA test were used to   analyze different clinical scenarios.

 Results

            Out of 86 physiotherapists, 11 did not participate and 23 failed to offer response.  Thus, final analysis was made from 52 physiotherapists who participated.  25% were government physiotherapists, 19.2% were worked in semi-government hospitals and 55.8% were private (Baidya, Acharya & Coppieters, 2016). It was found that many physiotherapists in all hospitals offered PT after physician consultation or   there were ‘blanker referral’ which allowed the PT to be done. The services were based on chest PT, positioning and therapeutic exercise or   there were ‘blanker referral’ which allowed the PT to be done.  Finally the study shows that the main role of the physiotherapists was positioning, rotational therapy, and exercise among others (Baidya, Acharya & Coppieters, 2016).

Article 2

 Patients in emergency department face the challenges of pain after traumatic condition.  Studies have found that children experience much pain than adults since they do not get adequate treatment or in other words there is inadequate pain management (Ramira, Instone & Clark, 2016). Long-term effect contributes to pain sensitivity, chronic pain ailment, anti-social behaviors and more. To solve this problem,  health care organization  have  tried to manage pain but the article  assert that  nurses should  apply evidence-based approach  in order  to improve patients’ outcome. In the study, quality improvement project was designed to help nurses improve pain management. Six hundred children aged 3months to 6years   were used for project review before and after the improvement projects.  Project team used literature review where the key term used was inadequate pain management. The literature recommended the use of education   as an effective strategy   for improving nurses’ knowledge and management practices (Ramira, Instone & Clark, 2016). After gaining evidence, the Institution Review Board approved the project and project team   used pain education to address the issue.  Pain education started on July 2011 and topic included were pathophysiology of pain medication and more.  Final data analysis was done on Feb 2012.

 Results

 Nurses who participated in pain educated were full time and part time workless on emergency department.   Nurses conducted pain assessment on pre- and post-intervention.  It was found that there was project effectiveness since ANOVA results showed that nurses improved pain documentation from 17% to 93% (Ramira, Instone & Clark, 2016).  Nurses’ documentation showed big improvement since there was 58 % change.  The project shows that pain education provides nurses with skills and knowledge on pain management. In addition, pain education programs help nurses improve decision and confidence I on managing pain. Thus, improved knowledge is a special tool for better documentation of pain, pain medication and reduction (Ramira, Instone & Clark, 2016).

 

 

 

 

Reference

 

 Baidya, S., Acharya, R. S., & Coppieters, M. W. (2016). Physiotherapy practice patterns in Intensive Care

Units of Nepal: A multicenter survey. Indian Journal Of Critical Care Medicine, 20(2), 84-90.

doi:10.4103/0972-5229.175939

 

 

Ramira, M. L., Instone, S., & Clark, M. J. (2016). Quality Improvement. Pediatric Pain Management: An

Evidence-Based Approach. Pediatric Nursing, 42(1), 39-49.

 

665 Words  2 Pages

Geriatric Dentistry

Introduction

Life expectations of people have been noted with the increase in the number of people who are geriatric. This condition is regarded to be a normal, inevitable and a biological condition or phenomenon. Study of physical and psychological changes which are mostly inclined to old age is known as gerontology and the care to the old age is called the clinical gerontology or simply geriatrics. Geriatric dentistry can similarly be defined as giving dental care to the elderly through diagnosis, the preclusion and the management of the issues which are related with the ordinary aging and also age-related infections as a part of the interdisciplinary team inclusive of other stake holders in healthcare industry (Holm-Pedersen et al,. 2015). Most governments in the world have specifically set the ages for the aged and those presumed to be aged in different categories. In some parts mostly the underdeveloped country, individuals who are 60 years and above of age are regarded as the elderly. The developed countries regard individuals who are 65 and above years of age as elderly (Anil et al., 2016). Worldwide, there are approximately over 600 million people who are 60 years and above and the number is considered to have risen by the year 2025.

The geriatric health in the world is one of the areas of health which are ignored and in most cases under-explored. The oral health gives a reflection to the welfare of the old population in the world. Aged patients are mostly inclined to the verbal situations in relation to their age and the ailments inclusive of some functional changes which might affect them in the process (Holm-Pedersen et al, 2015). Some of the major challenges which affect the practicing of the geriatric dentistry are the lack of a trained member, the system is overcrowded and the main one being the monetary constraints. For a quality and a successful treatment, practitioners have to adopt an approach that is humanitarian and in the act develop an understanding in terms of the attitude and the feelings of the elderly.

Early intervention and prevention strategies have to be formulated in order to lessen the risks of these verbal complications in the elderly inhabitants. Currently, professionals in the dental section have to possess a better perceptive of the level of the types of services which are to be offered in the aged population (Anil et al., 2016). This possibility can only be realized if there is an educational program subjected to the society without a delay in the geriatric dentistry.   

Xerostomia or the dry mouth condition is very common amongst the elderly individuals and is mostly associated with the decreased amount of the salivary gland function. The causes of the xerostomia in the elderly population have been inclined with the continued use of medicines, the chronic disorders, and radiotherapy to the neck and head regions. Patients who are diagnosed with the chronic xerostomia can have more than one oral or dental effect like the periodontal diseases, dental caries, ill-fitting dentures, fungal infections and the alterations of tastes (Gil Montoya et al., 2015). Xerostomia can have a serious effect on the quality of life and also alter a person’s eating style, the speech and also during swallowing. The current therapeutics in the management of the xerostomia is basically grouped as systemic and local salivary stimulation.

Polypharmacy

This is generally a practice of describing four and above medications to the same individuals. This in most cases happens to the older individuals who are affected by diseases. The known hazards of giving such medication include the cause of secondary morbidity due to prescribing inappropriate and unnecessary drugs and medicine incompatibility. The problems can also develop when the patients possess a poor understanding of the goal of their medicine and how to take the prescribed medicine. There are challenges which are related to the physiological changes which alter the ways that a drug is handled by the body (Gil Montoya et al., 2015). Polypharmacy in most cases happens due to multiple pathology poor communication between the providers of health care, lack of knowledge on aging and computerized records which are not updated accordingly. The older people can generally benefit from the many kinds of medicines today but the adverse effects and the side reactions of these medicines can jeopardize their health.

Brain conditions

Taking care of the dental part of the body is very essential. If a person does not take care of the teeth they turn yellow and they physically become painful which will ultimately lead to very many visits to the dentist. Most of these conditions are underestimated by many individuals and it is a dangerous alternative (Anil et al., 2016). The brain is also connected to the teeth and if there is an issue with the brain, then the problem will also affect the teeth and vice verse. The aged people experience memory loss in most cases and when this happens the body can shut down the many parts that depend on the brain. The loss of memory will eventually lead to a lack of concern and unknowingly cause other major issues to the body. People with few teeth are regarded to have a very poor memory (Gil Montoya et al., 2015). As a person becomes old, their teeth tend to become weak and fall off and in some people, they protrude outwards causing a discomfort during eating or brushing and in most cases, duties such as brushing are neglected.

Dentures

A high-quality diet is vital in the improvement and also the preservation of good and strong teeth. Fit teeth are very essential in assisting in the eating of healthy and assorted diet over the phase of a person. Geriatric clients are associated with a steadily increase in the dental services which involve a number of individuals requiring a detailed and complete denture. In America, it is estimated that over 50% of the people who are 65 years and above do were some form of dentures either completely or partially. Many reasons can affect an individual’s probability of wearing the dental prosthesis. One of the reasons is for a maximized taste and the texture sensation due to the covering of the palate. A big percentage of the people wearing the dentures start to develop sores which are very painful (Gil Montoya et al., 2015). For either a complete or a partial denture, a person must undergo a regimented dental protocol in order to ensure that it is appropriate for a laboratory test to a clinical test.

Conclusion

The general and oral health is basically a fundamental right in human beings. Oral health of a person determines the general health of a person and the general health with physically determine the happiness in the lifetime of a person (Holm-Pedersen et al, 2015). Good health is obtained from having a healthy diet and maintaining healthy teeth in the process.

 

 

 

References

Anil, S., Vellappally, S., Hashem, M., Preethanath, R. S., Patil, S., & Samaranayake, L. P. (2016). Xerostomia in geriatric patients: a burgeoning global concern. Journal of investigative and clinical dentistry7(1), 5-12.

Gil Montoya, J. A., Ferreira de Mello, A. L., Barrios, L., González Moles, M. Á., & Bravo Pérez, M. (2015). Oral health in the elderly patient and its impact on general well-being: a nonsystematic review. 

Holm-Pedersen, P., Walls, A. W., & Ship, J. A. (Eds.). (2015). Textbook of geriatric dentistry. John Wiley & Sons.

 

  

1238 Words  4 Pages

Breast Cancer

Introduction

Cancer of the breast is the most widely observed malignancy in women around the world, and a lot of research has been conduct on this non-communicable disease. Genetic and non-genetic factors are both involved in scientific study of the cause of breast cancer. The studies have involved different set factors that have been related to increased risk of breast cancer development and even reduction of these risks. These aspects include ATM (ataxia telangiectasia mutated) gene polymorphisms, genes related to Vitamin C and the interaction between environment and genes, and the interaction between known Environment Risks Factors and susceptibility of Common Breast Cancer Loci .

There remains gap in the explanations of breast cancer familial clustering other than BRCA1 (Breast Cancer Gene 1), carriers of BRCA2 and breast cancer risk in specific uncommon syndromes resulting from mutations of various genes like TP53. Ataxia telangiectasia disorder affects many body parts and increases the malignancy risks (Nickels et.al 2013). Carcinogens may stimulate different kinds of DNA damages, but ATM protein play a major role in recognizing and repair of DNA DSBs.  ATM protein is activated quickly and may phosphorylate many downstream substrates, and some of these substrates play a key role in regulating the arrest of cell cycle, repairing DNA and even apoptosis, by activating and stabilizing the p53 (Nickels et.al 2013).  

There can also be interaction between ATM protein with oncongenic protein, BRCA1 that suppresses any tumor, checkpoint Kinase and NBSI that repairs DNA.  A research that sought to determine ATM gene polymorphisms genetic frequencies, and examining the link between ATM genotypes and increase breast cancer risk involved the voluntary participation of 1232 cancer patients in Taiwan, China.  The study excluded patients with history of malignancy, metastasized cancer form unknown causes or those with genetic diseases. There were two groups of participants; 1232 cancer patients and 1232 female controls matched by age.  No significant differences were noted between both groups at various ages including menopause, first birth of a baby and enrolment. The results showed that ATM gene increases the risk of cancer, even though it plays a major role in pathways for DNA damage-repair (Nickels et.al 2013). Even though some studies have previous associated the heterozygous carriers of female ATM with increased risk of cancer especially in Westerns countries , there is no association of such relation found in Taiwan  that has a high prevalence of breast cancer , more deaths and early onset  where ATM plays the function of genetic marker. However, the allele for ATM rs189037 A was suggested to be likely to increase breast cancer risk (Nickels et.al 2013).

BRCA1and BRCA2 have been known to present high risk of mutations and hence breast cancer  even though there other variants that  lead to moderate susceptibility of breast cancer including ATM , CHEK2 and PALB2. In combination, these variants have been shown to explain 20- 25 percent of risks of breast cancer that are familial (Travis et. al 2010). Knowledge about possible modification of common susceptibility loci risks through environmental risk factors – lifestyle risk and reproductive factors – could offer insights into how cancer develops and especially the breast cancer causation for certain types of cancer. After many comparisons in large studies done recently, there has not been found any evidence that is statistically considerable to show multiple interactions between gene-environment and known breast cancer risk factors and susceptibility loci (Travis et. al 2010).  The absence of such evidence can be attributed to partly to limited capacity for detecting weal interaction between gen and environment and failing to take into account certain kinds of breast cancer. An evaluation of whether single-nucleotide polymorphism relative risks at various loci fluctuate in relation to some known risk factors can be done using different studies. In one such evaluation, the breast cancer assessment was done with negative and positive status of estrogen receptor (Travis et. al 2010).

After the evaluation was done with more environmental risk factors and recently established familiar susceptibility loci, there was showed apparent independent replication, and that there is interaction for both Estrogen Receptor – positive and Estrogen Receptor –negative condition. Lack of similarity in interaction can be said to be plausible because birth’s number and SNP do not show heterogeneity through Estrogen Receptor status in relation to risk of breast cancer. As such, the study found finds evidence of any relation between LSP1-rs3817198, which increases cancer risk, and women being porous (Travis et. al 2010). The heterogeneity effect of LSP1-rs3817198 seems to be resulting partly from considerable negative association between births number in porous women and immune genotype. In addition, there is an increased risk of developing cancer of the breast for those women who drink alcohol. Alcohol in this case is an environmental risk factor. Caspase 8 protein is key in initiation of death cells and its activation result from damage of DNA by factors such as alcohol, a big cause of oxidative stress that is ethanol related.  Most SNPs variations have been shown to be only indicators of the impact of present causal variants in a gene (Travis et. al 2010). Hence, the interaction of the gene and the environment with existing causal variants may have a larger modifying impact on breast cancer relative risk.

 

 Some susceptibility loci of breast cancer that are low-penetrance have been established in various genome related studies, but there is little knowledge about the effect of environmental factors such as behavioral, reproductive and anthropometric risks .A study of interaction between gene and environmental factors done with the participation of 7610 women suffering from breast cancer was done to explore more knowledge on the same. The analysis included 7610 female patients suffering from incident breast cancer and 10196 healthy women, with a mean age of 60 years (Travis et. al 2010). On average , all the cases were probably less porous , were older during first birth , the body-mass index was more ,  more consumption of alcohol , and were more likely to be under Hormone Replacement Therapy than other controls.  Ten environmental factors were assessed to check whether could be linked to 12 SNPs (single-nucleotide polymorphism) variations. After multiple testing was done, there were no considerable relations between eleven of the twelve polymorphisms and the risk factors. The strongest indication of association was the between alcohol consumption and gene CASP8-rs104548 (Travis et. al 2010). There was increased and greater risk for women who reported a history of alcohol intake – one drink each day – than those who took less alcohol.  After many tests were done, the association was not significant. There were no material differences after women were subdivided into more than two groups and the risk factors were considered continuous (Travis at. al 2010).

 Present use of Hormone Replacement Therapies was associated with more risk of developing cancer of the breast and more effect on oestrogen-receptor -positive tumors that the negative ones. But such was not seen after many tests. After multiple tests were done none of the environmental factors showed any significant relations with increased cases of cancer development (Travis et. al 2010). In addition, there was no strong link between the risk factors and the genotype under study were established which seems to show that susceptibility loci examined do not have effect on risk of breast cancer through by use of mechanisms that involve environmental factors (Travis et. al 2010). There are, however, some relative risks associated with some genotype and the relation to between cancer risk and environmental factors could not be proved most likely due to limited power to detect such interaction. While many environmental risk factors are associated with cancer development, few associating is done on genotype factors. For instance, taller women have a slightly higher risk of developing breast cancer than shorter female, and the shorter ones the major carriers of the high risk genes (Travis, et. al 2010).

On the cancer prevention , North- South gradients observations in cancer of breast mortality and prevalence has made researchers to develop a theory holding that  vitamin D may be necessary in cancer prevention . The role of this Vitamin has been supported by huge experimental evidence, in relation to the fact that it regulates proliferation and differentiation of breast cells.  However, there is need to examine the relations between risk of breast cancer and polymorphisms in SNPs genes related to vitamin D (Fuhrman, et. al 2013).  A study in the same, using participants who in previous studies have indicated no history of breast cancer, has been done to examine this association.  More than half of the participants, who passed the criteria, indicated an occurrence of primary cancer of breast in the period between previous surveys. The inclusion of sun exposures measures was necessary since vitamin D is synthesized by the skin after being exposed to sunlight. The various established risk factors for breast cancer were involved including menopause age, menarche age, full pregnancy numbers, and first birth age and breast cancer history (Fuhrman, et. al 2013).

 There was observed a disproportionate trend in risk of breast cancer in relation with rare alleles number for Bsml variant and no material association with such risk was established for polymorphism related to FOK1.  There was no significant difference between breast cancer controls and incidents in regard to a person’s residence geographical location (Fuhrman, et. al 2013).  There is no material risk trend observed across different ambient sunlight average each year. The study established that there was an association between risk of breast cancer and vitamin D genes SNPS.  Such risks are likely to mostly affect younger women in the adolescence since their breast tissues have not differentiated, and may pose a greater risk for cancer in later life (Fuhrman, et. al 2013). Therefore, the Vitamin D pathways were found to be associated with more risk even tough further support was need to prove the case.

Conclusion

Genetic and non-genetic factors are both involved in scientific study of the cause of breast cancer. The association between risk of developing breast cancer, the genotype factors and the environmental factors has been studied extensively over the years. The results of these studies have not been consistent as to clearly establish the cause breast cancer development, even though genetic and environmental risks factors have largely been established.  There different aspects that have been attributed to the limitation of these studies and which need to be addressed to establish breast cancer causation.

References

Wang, H. C., Chang, W. S., Tsai, R. Y., Tsai, C. W., Liu, L. C., Su, C. H., ... & Bau, D. T. (2010). Association between ataxia telangiectasia mutated gene polymorphisms and breast cancer in Taiwanese females. Anticancer research, 30(12), 5217-5221.

Nickels, S., Truong, T., Hein, R., Stevens, K., Buck, K., Behrens, S., ... & Gaudet, M. (2013). Evidence of gene–environment interactions between common breast cancer susceptibility loci and established environmental risk factors. PLoS Genet, 9(3), e1003284.

 

Travis, R. C., Reeves, G. K., Green, J., Bull, D., Tipper, S. J., Baker, K., ... & Lathrop, M. (2010). Gene–environment interactions in 7610 women with breast cancer: prospective evidence from the Million Women Study. The Lancet, 375(9732), 2143-2151.

 

Fuhrman, B. J., Freedman, D. M., Bhatti, P., Doody, M. M., Fu, Y. P., Chang, S. C., ... & Sigurdson, A. J. (2013). Sunlight, polymorphisms of vitamin D-related genes and risk of breast cancer. Anticancer research, 33(2), 543-551.

 

 

1878 Words  6 Pages

Literature Review of Congestive Heart Failure

Introduction

Congestive heart failure (CHF)’s, frequency is increasing at a warning rate globally because of the increasing lifespan leading to a high elderly populace. CHF can be described as vital to the nursing expertise given that it is among the leading mortality causes among the hospitalized patients with cardiac issues. CHF illustrates the general, incapability of the heart in pumping adequate blood in the quest of meeting the metabolic needs of the body such as the supply of nutrients and oxygen that results in inconsistencies amid my cardinal oxygen demand as well as demand (Carpenter, 2015). America alone has an approximation of 6 million persons affected by CHF. This, therefore, shows that with the growing increase the next few years might present psychological and financial issues to the society on the grounds of CHF. Different strategies have been utilized in teaching the management and prevention of CHF among the elderly and vulnerable patients. Thus the necessity for CHF education and increased understanding of the issue is quintessential so that nurses can combat the increasing CHF victim’s numbers.

Methods

The research is an evidenced based one and thus all the sources needed to be evaluated in such of accuracy, usefulness, and relevance of the given information. Since secondary sources which in this case are focused on articles are to be utilized in the research systematic review was conducted. The evaluation criteria began by assessing the authority of the articles. This involved an assessment of all the articles on the authority held by the publishers and authors. The sources had to contain authoritative authors and had to be peer reviewed for dependability of the information. Despite the fact that the articles were acquired from scholarly sources internet sources are bound to create questions in regard to being reliable if there are no authors. In addition, credible publishers such as government agencies or established organizations tend to be more reliable and accurate if though the author's name may be missing.

Accuracy, content, and relevance are some of the additional factors that were assessed. In that, the sources were evaluated by establishing whether the given content was providing answers to the research queries to establish whether they would help in developing the paper. The relevance of the sources was established by analyzing the introduction and the content table to understand the subject being handled. Accuracy was evaluated on the grounds of clearness, well-cited information with a reference list and information correctness. Moreover, the sources had to be objective and addressing a specific audience. The purpose of the article should not be biased and should be more focused on trying to offer information in regard to a given subject rather than attempting to promote certain opinions. This means that the objective should be an obvious one for credibility to be established. The intended audiences were evaluated based on their authority in influencing the decision and changing the direction of the study. Lastly, the writing style and currency features were evaluated. The organization of the suitable sources had to be a logical one with a clear provision of arguments, a proper structure for easy follow up, formal and proper wording. In addition, the articles ought to have been published within the last five year given that currency is crucial since the topic dictates the utilization of recent information in justification of the need for CHF education based on the current issue.

    Synthesis of Literature Review

The article authored by Carpenter, (2015), is focused on how CHF care can be improved using a clinical decision option. It discusses the manner in which the clinical decisive unit can be implanted in America for patients with CHF. The article established that the implementation would low the mortality rate for the patients with cardiac issues, lead to saving increased costs and provides learning opportunities for the nurses and nursing leadership. In general, this would lower CHF issues, particularly among the elderly persons by learning how their conditions can be monitored best. The study was accomplished via the use of a qualitative approach where cardiac patients were involved in the test based on their hospitalization period. 

The article by Kalter-Leibovici et al, (2017), discusses the effectiveness of the programs utilized in managing diseases in developing heart failure outcome among patients. A qualitative approach was utilized in a hospital setting trial for the patients with access to quality health services and technological care. Services such as care coordination, diseases monitoring as well as patient education were utilized. It was established that among the admitted populace with heart-related issues 70 of them are not aware of how they should manage the conditions. However, based on the study the patients that are subjected to the programs for diseases management held better life quality that is related to health with reduced pressure and depression rate. The article, therefore, supports the study’s PICOT as it describes the issue and proposes for solutions.

The article by Kher, Johnson & Griffith, (2017), discusses the use of online health data for the CHF patients. According to the article, the use of online information in education CHF patients tends to be highly ineffective given that it only incorporates a low group of individuals. The research utilized a systematic review via a quantitative method. Search phrases such as CHF were utilized in the search for the most appropriate articles. For the elderly group, a significant number of them have not acquired education above the 6th grade which makes the information to be unusable for the affected groups. The article, therefore, states that more effort should be made in adjusting education materials that are provided on the online platforms for efficiency to be acquired. 

Smith, (2013), article mainly discusses the telemonitoring interventions that are required in lowering the general readmission of patients suffering from CHF. The study utilized a critical review on the grounds of the data that is available. The results suggested that telemonitoring is an effective approach that can be utilized in lowering CHF associated issues that lead to readmission. This is because readmission holds both financial as well as psychological effects. Most patients are always forced to get back to being admitted after their conditions get worse post their dismissal in hospitals. This is usually the case because of the lack of management education. Nurses offer less or zero education on how they can best handle the conditions and this results in worsening of the symptoms. In addition, those at risk are not aware of the strategies that they can apply in ensuring that they do not suffer from the illness. This results in increased mortality rate since it is usually challenging to rectify the situation after getting worse. The article supports my PICOT because it describes the issue of CHF education and recommends some strategies that can be utilized in being effective.

Vedel & Khanassov, (2015), in the article, was focused on determining transitional care impact as an intervention approach on critical health acre that is utilized by CHF patients. A randomized trial and a systematic data review were conducted. The resulted indicated that transitional care is effective in reducing the risks that are involved that lead to being readmitted. In that, the patients are provided with important information that helps in better condition management. In addition, the study indicated that the implementation of the care should be an intensive one which is highly effective regardless of being applied in the shortest duration. The article’s subjects suit the study’s question because it will help in demonstrating how the use of health intervention in providing education for the patients can help in dealing with the CHF issue that is on the rise. In addition, this will help in demonstrating why education is the best option for solving the issue in the society due to the changing period via technology use.

            The articles are similar as the addresses the issue of CHF education which is of necessity and proposes different approaches that can be utilized in addressing the matter. They, however, differs as they propose different intervention while some advocates for a long run and others short run approaches.

            Future study

            It is apparent that CHF education is of great significance in lowering the mortality rate, readmission rate and preventing the populace from acquiring the disease. However, different strategies with differing application have proved to be effective based on the evaluation of the sources. Some of the areas that require further investigation in the future include how the health care sector can provide more education to nurses in order to ensure that all the clinical needs of these patients are addressed. In addition, the methods through which the interventions such as transitional care and online education as management strategies needs investigation. 

 

 

 

 

 

 

            References

Carpenter, J. E. (2015). Improving Congestive Heart Failure Care with a Clinical Decision Unit. Nursing Economic$, 33(5), 255-262.

Kalter-Leibovici, O., Freimark, D., Freedman, L. S., Kaufman, G., Ziv, A., Murad, H., & ... Israel Heart Failure Disease Management Study (IHF-DMS), I. (2017). Disease management in the treatment of patients with chronic heart failure who have universal access to health care: a randomized controlled trial. BMC Medicine, 151-13. Doi: 10.1186/s12916-017-0855-z

Kher, A., Johnson, S., & Griffith, R. (2017). Readability Assessment of Online Patient Education Material on Congestive Heart Failure. Advances in Preventive Medicine, 1-8. doi:10.1155/2017/9780317

Smith, A. C. (2013). Effect of Telemonitoring on Re-Admission in Patients with Congestive Heart Failure. MEDSURG Nursing, 22(1), 39-44.

Vedel, I., & Khanassov, V. (2015). Transitional Care for Patients with Congestive Heart Failure: A Systematic Review and Meta-Analysis. Annals of Family Medicine, 13(6), 562-571. doi:10.1370/afm.1844

 

 

 

 

1600 Words  5 Pages

Negative effects of lack of sleep

Introduction

Sleep is important as it enhances the well-being in terms of emotional regulation and cognitive performance. It is advisable that people should get enough sleep in order to avoid diseases such as coronary heart disease and others which affect mental and physical health. An important point to note is that while sleeping, brain functions effectively and leads to consolidation of memories, brain development and energy conservation. Sleep is also associated with positive growth and development, where human beings develop healthy weight.  In addition, it is important to get enough sleep in order to improve learning (as it is stated by studied), be creative and improve problem solving skills. The purpose of this paper is to examine the negative effects of lack of sleep. Things to note are that lack of sleep or sleep deficiency results to chronic health problems related with neurocognitive disorders, neurobehavioral disorders, psychiatric conditions, cognitive impairment and other problems.

 

ORZEŁ-GRYGLEWSKA (2010) asserts that lack of sleep or sleep deprivation is a state where human being lack sleep in a certain period or a state where human beings do not get enough sleep as required. People are involved in sleep deprivation due to various factors one of them being work-related factors. Both chronic and acute sleep deprivation is associated with negative consequences which affect cognitive functions and operant memory. This article presents negative effects of lack of sleep from evidence-based practice where in the first study, volunteers experienced sleep deprivation in 90-hours and the second study human beings experienced lack of sleep in one week. The findings showed that lack of sleep is associated with many negative effects.

            The first effect is exteroceptive impairments. Lack of sleep causes visual disruption where human beings create inaccurate image formation and as a result, people experience double vision and hallucinations. What happens is that lack of sleep creates tunnel vision and as a result, human beings develop visual errors (ORZEŁ-GRYGLEWSKA, 2010). Second is the cognitive and operant process. Lack of sleep and prolonged wakefulness leads to impaired cognitive processing. In addition, sleep deprivation results to distraction of thoughts which affects the accurate and effectiveness of performance. For example, lack of sleep in a single night contributes to 20-32% of visual errors and 14% of errors are contributed in an electrocoagulation trial (ORZEŁ-GRYGLEWSKA, 2010). Other point is that prolonged wakefulness is associated with intonation impairments. This means that in the study, individuals who lacked sleep in one week were unable to verbalize their thought, they hard difficulties in reasoning and they could not perform task which required thinking and ability. Third are metabolic alterations. The study showed that individuals who slept only four hours in a single night increased appetite and hunger and this was as a result of leptin hormone. Lack of sleep also increases diabetic conditions and obesity which was as a result of imparement of glucose metabolism and lower energy expenditure. Young children in the study had a high BIM which is responsible for increasing weight. The study showed that reduction of sleep time is associated with risk of overweight.  For example, the study showed that lack of sleep increased the risk of increasing 5kg by 35% and the risk of developing obesity was 27% (ORZEŁ-GRYGLEWSKA, 2010).  Lack of sleep weakens the activities of brain structures. In the study, individuals   who experienced 72-hour wakefulness decreased the metabolic rate of the brain by 6-8%. Other thing which was noticed is the glucose hypometabolism in various parts including hypothalamus, thalamus, cerebellum and others. The hypometabolism affected the   activities in motor speech center where cognitive functions decreased. On the same note, lack of sleep is associated with manic symptoms which affect the mental functions (ORZEŁ-GRYGLEWSKA, 2010).  The study showed that individuals who lacked sleep suffered from interpersonal relationships and emotional intelligence. In addition, these individuals developed aggressive behaviors and other psychopathology behaviors such as insanity. Lack of sleep is associated with therapeutic application in that human beings are unable to perform normal functions. This occur when individuals develops depressive disorders which is contributed by organized activities (ORZEŁ-GRYGLEWSKA, 2010).     

 

 Christian and Ellis (2011) use psychological and neurocognitive perspectives and state that lack of sleep affects self-control and increases hostility. The two leads to workplace deviance within the organization and as a result, this becomes a big problem to the organization. Workplace deviance is a threat to the well-being of the organization especially when individual develops deviance behaviors such as drug use, poor performance, vandalism and more (CHRISTIAN & ELLIS, 2011). Employees who are exposed to deviant behavior develop stress-related problems and fear at work which leads to turnover. Sleep research is used in many organizations to examine how deviance behaviors are related with   lack of sleep. Many studies and researchers have found that sleep deprivation is associated with disastrous behaviors which range from work performance, decision making, and worker well-being among many.  According to National Center on Sleep Disorder Research, in every year, U.S spends $150billion to cover loss contributed by accidents (CHRISTIAN & ELLIS, 2011). The authors assert that sleep is capable of influencing brain functions and individual alertness. However, sleep deprivation or lack of sleep affects the cogitative capacity. In addition, evidence show that lack of sleep affects self-regulation and affects the innovative thinking skills. Other point is that lack of sleep affects the brain functioning and the effect occurs when the prefrontal part of the brain is affected. This part is critical as it comprises neocortical structures which serve the purpose of controlling emotions, executive and supervisory. What happens is that individuals with sleep deprivation act impulsively-meaning that they act aggressively and violates social norms. This occurs due to the impairment of prefrontal cortex and when this part is damaged, it leads to antisocial behaviors.  The issue of self-regulation arises when brain function (prefrontal cortex) is affected (CHRISTIAN & ELLIS, 2011). What happens that is that brain damage occurs when glucose metabolism is low and glucose plays a significant role in the self-regulation.  When the brain part known as prefrontal cortex is damaged, self-regulatory resource depletion is developed. The article finds that sleep deprivation is associated with workplace deviance behaviors.  Self-regulation encompasses the control of behaviors and emotions, and the occurrence of self-regulatory resource depletion is an indication that individual develops lack of self-control and hostility. The article affirms that when self-regulatory resources which control the behaviors are damaged, individuals develop deviant behaviors. In addition, the individual acts impulsively and creates risky decisions.  Sleep deprivation or lack of sleep affects the emotion regulation (CHRISTIAN & ELLIS, 2011). This happens when prefrontal cortex is damaged which results to negative emotions which means that an individual is unable to regulate negative emotions and thus shows hostility.

Chittora et al (2015) assert that sleep is a physiological process responsible for the development of mental and physical health. However, lack of sleep or sleep deprivation results to neurobehavioral and neurocognitive effects and impaired functionality which leads to neuropathology.  Lack of sleep weakens the functions of brain structures. For example, lack of sleep for about 72hours reduces the brain metabolic rate by 6-8% (Chittora et al, 2015). In addition, the article asserts that lack of sleep increases the level of plasma glucocorticoids and cortisol which leads to brain cells damage. Other negative effects of lack of sleep include muscles ache, memory lapse, hallucinations, headaches, high blood pressure, diabetes, obesity among many. Lack of sleep leads to depressive disorders, cancer and other diseases and these occur due to the suppression of immune system. Behaviors disturbances such as motor activity, body weight and more are contributed by sleep deprivation (Chittora et al, 2015). All these effects occur due to the fact that lack of sleep causes oxidative challenges which interfere with the brain. The latter has high metabolic rate, high oxygen consumption, and high fatty acids which makes it vulnerable be the oxidative challenges. The Oxidative stress interferes with the defense system and fails to remove the free radicals. In addition, the oxidative stress affects the neuron and cause synaptic plasticity impairment which promotes memory deficits and finally causes neurodegeration (Chittora et al, 2015).

 

 

Conclusion

Sleep plays a significant role in maintaining the well-being of human beings. Various studies and researches have shown that sleep promotes physiological homeostasis, and for a human being to live healthy life, it is advisable to get enough sleep. In addition, for brain to function properly and make memory consolidation, sleep is needed. Sleep play many roles such as removing waste products from brain, promotes synaptic plasticity, energy conservation, brain development and growth, brain repair among many other functions. However, sleep deprivation is associated with negative outcomes such as brain impairment, verbal disturbances, mental-fatigue, epileptic attack, insomnia, impaired learning and more. The research has also found that lack of sleep interferes with the cognitive and emotional functions. 

 

 

 

 

 

 

 

Reference

ORZEŁ-GRYGLEWSKA  Jolanta. (2010). CONSEQUENCES OF SLEEP DEPRIVATION. International Journal of Occupational

Medicine and Environmental Health23(1):95–114 DOI 10.2478/v10001-010-0004-9

 

Chittora, R., Jain, A., Suhalka, P., Sharma, C., Jaiswal, N., & Bhatnagar, M. (2015). Sleep deprivation:

Neural regulation and consequences. Sleep & Biological Rhythms, 13(3), 210-218.

doi:10.1111/sbr.12110

 

CHRISTIAN, M. S., & ELLIS, A. J. (2011). EXAMINING THE EFFECTS OF SLEEP DEPRIVATION ON

WORKPLACE DEVIANCE: A SELF-REGULATORY PERSPECTIVE. Academy Of Management

Journal, 54(5), 913-934. doi:10.5465/amj.2010.0179

1551 Words  5 Pages
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