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ARAS: atherosclerotic renal artery stenosis; OPCAB: cardiopulmonary bypass; OPCAB: off-pump coronary bypass; CrPre: CrPre: preoperative creatinine; CrmaxPost: peak postoperative creatinine; ΔCr: difference between preoperative creatinine and postoperative creatinine; %ΔCr: percentage change of creatinine.
