In our study population, 95 (67.9%) patients presented with renal failure at different stages according to the RIFLE criteria. Planinsic and Lebowitz observed renal failure in more than 80% of cases during the first 48 hours after surgery for liver transplantation. Mortality was extremely high in up to 50% of liver transplant recipients with renal dysfunction at 30 days following surgery and, if hemodialysis was required, it could reach 60% [35] . The etiology of renal failure after liver transplantation is certainly multifactorial. Most reported risk factors are pretransplant renal dysfunction, low serum albumin, dysfunction of the liver graft, bacterial infections and reoperations [36] .