- In terms of preoperative kidney function and some laboratory tests, we found that, the eGFR less than 60ml / min/1.73 m 2, serum creatinin greater than 106µmol / L and serum glucose >7 mmol / L were more seen in AKI group. 14 Intraoperative variables - Some factor was found to relate to AKI including CPB time ≥ 120 minutes, aortic cross clamping time ≥ 60 minutes, packed red blood cell infusion, frozen plasma infusion ≥ 2 units, lowest body temperature <35oC và intraoperatively vasoactive use.