Hypothesis testing revealed that there were statistical differences between AKI and non-AKI patient groups including age, gender, DM, previous heart failure, NYHA functional classification, preoperative diuretic use, preoperative hemoglobin, preoperative hematocrit, preoperative albumin, baseline SCr, preoperative eGFR, preoperative LVEF, erythrocyte transfusion, IABP application, LCOS, vasoactive medicine application, duration of mechanical ventilation, arterial lactate level after operation (Table 1). This evidence concerns the gene ALB and acute kidney injury.