Results: We studied 81 ablated patients with idiopathic ventricular outflow tract at Thong Nhat Hospital from 2004 up to now: RF ablation is highly effective (96.3%) with 47 patients from septal RVOT, 28 patients (34.6%) from the free wall of RVOT, 3 patients (3.7%) ablated in the left outflow tract, with 6.1% recurrent rate.