Abstract: to study the incidence and risk factors after off-pump coronary bypass grafting(OPCABG). Methods: the clinical data of 537 patients of our hospital undertaking OPCABG between June 2009 and December 2009 were retrospectively analyzed. According to the relevant domestic AKI diagnostic criteria, divided the patients into AKI group with AKI and control group without AKI, the incidence and the risk factors of postoperative AKI were counted and analyzed. Results: AKI with an incidence of 14.7 % (79/537) occurred in 537 patients. Single factor analysis showed that there were significant statistics differences among advanced age, hypertension ,preoperative serum creatinine, number of grafts, mechanical ventilation time，ICU time and postoperative low heart output. Logistic multi-factor regression analysis showed that advanced age, hypertension, preoperative serum creatinine, number of grafts , mechanical ventilation time and postoperative low heart output were independent risk factors of AKI. Conclusion: AKI was one of the most common and serious complications after OPCABG, which should cause clinical high attention. Advanced age, hypertension, preoperative serum creatinine, number of grafts, mechanical ventilation time and postoperative low heart output were independent risk factors of AKI.

Key words: Coronary artery bypass grafting, Renal failure, Acute, Risk factors, off-pump cardiopulmonary bypass