Radiofrequency catheter ablation of idiopathic left ventricular tachycardia in a child.

Ventricular tachycardia occurring in apparently normal heart is rare in children. A 9-year-old boy presented with recurrent palpitations and syncope was found to have idiopathic ventricular tachycardia with a right bundle branch block morphology and left axis deviation. Pace mapping and activation mapping were used to localize the site of ventricular tachycardia origin. Radiofrequency catheter ablation successfully abolished this arrhythmia at a site of the midportion of the inferoseptal region of the left ventricle. This boy was free of tachycardia over follow-up of 2 years.