New Markers of Cardiac Surgery Related Acute Kidney Injury.

concentration of ischemia modified albumin assessed in blood before operation, immediately and one hour after cardiopulmonary bypass, 24 hours after operation; concentration of urinary excretion of brush-border enzymes of the proximal renal tubules assessed before operation, immediately and one hour after cardiopulmonary bypass, 24 hours after operation, serum creatinine levels will be evaluated on the day of the operation and 24 h and 48 h postoperatively