There was also evidence that RIPC reduced the incidence of postoperative atrial fibrillation by 54 % ( 11 % RIPC vs 24 % control ; p = 0.031 ) and decreased the incidence of acute kidney injury by 48 % ( 10.0 % RIPC vs 21.0 % control ; p = 0.063 ) , and intensive care unit stay by 1day ( 2.0 days RIPC ( CI 1.0 to 4.0 ) vs 3.0 days control ( CI 2.0 to 4.5 ) ; p = 0.043 ) .