Exclusion Criteria:Exclusion criteria included the following: 1) need for urgent cardiac surgery, 2) cardiac arrest ≤ 1 week before surgery, 3) prior procedure with hypothermic CPB, 4) acute or chronic infection, 5) major noncardiac congenital anomalies or chromosomal abnormalities, 6) preoperative arterial pH ≤ 7.0, 7) any significant noncardiac organ dysfunction such as renal failure, respiratory failure, seizures, or necrotizing enterocolitis, and 8) use of another investigational drug.