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Other key factors associated with DGF include the duration of brain death (>24 h) and the length of stay in the intensive care unit (>40 h) (35,38). Anticoagulation is routinely used during organ recovery from donors diagnosed with brain death; whereas the same treatment remains ethically controversial for DCD donors because anticoagulation does not relieve suffering but may hasten death if the patient is at risk of hemorrhage (39). Macroscopic thrombosis at time of procurement is a rare event. http://www.selleck.cn/products/SP600125.html The prevalence of microscopic allograft thrombosis, however, may be underappreciated and underreported (40). Melagatran is an anticoagulant that inhibits fibrin deposition and has the potential to prevent microthrombi formation. In a pig model of DCD donors treated with the thrombin inhibitor melagatran prior to infusion of University of Wisconsin (UW), graft survival and function were improved http://www.selleckchem.com/products/epz015666.html when followed up to 3 months (41). Treatment was associated with reduced P-selectin and C3 mRNA transcripts indicating less endothelial activation. In another study, the same investigators found treatment with melagatran reduced expression of oxidative stress mediators, including Nox2 and iNOS. In summary, the benefit of thrombin inhibition likely derives from its influence on both the coagulation cascade and oxidative metabolism (42). Historic rates of DGF are highest in patients receiving organs from donors undergoing controlled withdrawal of care known as donation after cardiac death (DCD). Central to the risk identified in this donor population is the duration of perfused ischemic time between extubation and asystole commonly known as warm ischemic time. This period leaves the kidney susceptible to sustained anaerobic metabolism manifest in the postimplant http://www.selleckchem.com/products/smoothened-agonist-sag-hcl.html biopsy as acute tubular necrosis (ATN) (Figure 2) (43). As the renal cortex is reperfused, perivascular edema of capillaries perpetuates ischemia at the level of the corticomedullary junction. Medullary warm ischemia results in the condition of ��microvascular no-reflow�� (44,45). If this period of time is prolonged the risk of primary nonfunction escalates. In procurement protocols that limit warm ischemic time to