This study dealt with 39 infants less than 12 months old who underwent operative correction of ventricular septal defect using extracorporeal circulation under normothermia. The "catch-up" growth pattern of these infants after VSD closure is most gratifying. It was strongly suggested that adequate postoperative weight gain was produced by improvement of infantile lobar emphysema. Results of catheterizations that 18 patients underwent more than 1 year after operation were satisfying except 2 patients reoperated on for residual shunt. Residual shunt was detected in 4 patients 2 of whom had no indications for reoperation for 5 years after operation. We considered that residual shunt should be followed up without immediate reoperation, if symptoms improve. Though there was no late mortaliy, RBBB and LAH following temporary complete A-V block appeared on 2 patients. Careful follow-up is necessary for these patients.
