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[Catheter ablation of ventricular tachycardia in the left ventricular outflow tract beyond the aortic valve].

This case report describes successful catheter ablation of an ectopic focus in the left ventricular outflow tract just beyond the aortic valve. Extended pace-mapping revealed a focus about 1 cm beneath the origin of the left coronary artery--above the base of the left coronary cusp. During a follow-up of 1 year no further spontaneous episode of ventricular tachycardia was documented. This case report describes an unusual localization of an idiopathic ventricular tachycardia and it demonstrates that radiofrequency catheter ablation can be done even in a critical position.