<qa>  What is an important factor for predicting perioperative patients outcome regarding acute kidney injurySerum-creatinine level s-Cr is an important factor for predicting perioperative patients outcome regarding acute kidney injury. Although cardiopulmonary bypass CPB, an essential procedure for cardiac surgery, dilutes patients blood components, possible impact of applying acute normovolemic hemodilution ANH and CPB on s-Cr has not been well investigated. 