Comparison of Hematocrit Levels in Infant Heart Surgery

Inclusion Criteria: * Undergoing repair of ventricular septal defect within 9 months of study entry * Tetralogy of fallot * D-transposition of the great arteries * Atrio-ventricular septal defect Exclusion Criteria: * Birth weight less than 2.3 kg * Recognizable phenotypic syndrome of congenital anomalies * Extracardiac anomalies of greater than minor severity * Previous cardiac surgery * Associated cardiovascular anomalies requiring aortic arch reconstruction or additional open surgical procedures before the planned developmental follow-up