Idiopathic left ventricular tachycardia is a distinct clinical entity
with a typical ECG of right bundle branch block and left axis deviatio
n. We presented a 39-year-old man with idiopathic left ventricular tac
hycardia, which demonstrated change in the configuration of QRS comple
x during successive radiofrequency catheter ablation. We proposed that
this idiopathic left ventricular tachycardia may have alternative pat
hways within the reentrant circuit leading to different exits.