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Abdominal surgery is probably associated with more likelihood to cause acute kidney injury (AKI). The aim of this study was to evaluate whether early or late start of renal replacement therapy (RRT) defined by simplified RIFLE (sRIFLE) classification in AKI patients after major abdominal surgery will affect outcome.    Methods  A multicenter prospective observational study based on the NSARF ( N ational Taiwan University  S urgical ICU  A ssociated  R enal  F ailure) Study Group database. 98 patients (41 female, mean age 66.4 ± 13.9 years) who underwent acute RRT according to local indications for post-major abdominal surgery AKI between 1 January, 2002 and 31 December, 2005 were enrolled The demographic data, comorbid diseases, types of surgery and RRT, as well as the indications for RRT were documented. The patients were divided into early dialysis (sRIFLE-0 or Risk) and late dialysis (LD, sRIFLE -Injury or Failure) groups. Then we measured and recorded patients' outcome including in-hospital mortality and RRT wean-off until 30 June, 2006.    Results  The in-hospital mortality was compared as endpoint. Fifty-seven patients (58.2%) died during hospitalization. LD (hazard ratio (HR) 1.846;  P  = 0.027), old age (HR 2.090;  P  = 0.010), cardiac failure (HR 4.620;  P  < 0.001), pre-RRT SOFA score (HR 1.152;  P  < 0.001) were independent indicators for in-hospital mortality.    Conclusions  The findings of this study support earlier initiation of acute RRT, and also underscore the importance of predicting prognoses of major abdominal surgical patients with AKI by using RIFLE classification.

Late initiation of renal replacement therapy is associated with worse outcomes in acute kidney injury after major abdominal surgery