Eight patients with idiopathic ventricular tachycardia (VT) underwent mappi
ng and radiofrequency ablation. Mapping showed VT originating in the high p
osterolateral left ventricular outflow tract in proximity to the left main
and proximal circumflex coronary arteries. Ablation was not attempted due t
o this proximity to the left main and proximal circumflex coronary arteries
. Ablation was not attempted due to this proximity in 2 patients and limite
d in 1 patient. It was successful in VT suppression in 5 of 6 patients.