HP and acute kidney injury: The Jafron study group vs. control group reported postoperative values forcell-free hemoglobin at 10 minutes after CPB (mg/L) (11.6 ± 0.6 vs.29.9 ± 0.3) (P-value 0.021), haptoglobin 10 minutes after CPB (mg/dl)(129.16 ± 1.22 vs. 59.17 ± 1.49) (P-value 0.017), creatininepeak after CPB (mg/dL) (0.92 ± 0.17 vs. 1.32 ± 0.9) (P-value0.030), and acute kidney injury after 48 hours (number of patients) (one vs.four) (P-value 0.027).