Objective: Recent evidence has stressed on the importance of how the infundibulalr should be preserved or developed in TOF repair. In addressing this point, a new concept of infundibular rehabilitation was developed. The early results of our experience are presented herein. Methods: From Sep.2001 to Sep.2004, 85 consecutive patients underwent total correction of TOF. VSD was closed through the RA in every case. Transannular patching(TAP) was performed in 60 patients(group I,70.6%) and in 25 patients no patching was done(group II,29.4%). TAP was performed by a new technique developed by our group, which resulted in minimal damage to the transverse basal loop while producing effective mobilization of the pulmonic annulus and the infundibulum. In order to evaluate the right ventricular(RV) function, the degree of PR and RV dilatation were assessed by echocardiogram. EKG recordings were also obtained to check QRS duration. The results were compred with those patients who did not undergo TAP. Results: There were no significant difference between the two groups in terms of age and body weight, but CPB time(group I,95.1짹18.3min vs group II, 82.3짹14.0min,p<0.01) and ACC time(group I,63.6짹10.4min vs group II, 53.1짹9.7 min,p<0.01) were both longer in group I. There was also no mortality, in either group. A total of 5 re-operations(5.9%) were performed; 3 in group I(5%) and 2 in group II(8%), all of which were for residual RVOT stenosis. As for the RV function, there were no differences between the two groups with regards to RV dilatation(group I,19/60 vs group II,7/25,p>0.7), QRS duration(group I, 101.5 짹20.6ms vs group II, 97.9짹18.3ms,p>0.4) or the incidence of mild and moderate PR(less than mild;group I,56/60,93.3% vs group II,24/25,96%, moderate;group I,4/60,6.7% vs group II,1/25,4%). Furthermore, there was no case of severe PR in either group. Mean follow up was 15.1months and no patients were lost. Conclusions: The results of this study showed the new concept of the infundibular rehabilitation to be safe and promising, especially in view of the positive findings which showed excellent RV performance. For assessment of long-term RV function, further quantitative studies on RV performance should be followed.