Ablation of atrioventricular conduction in corrected transposition of the great arteries

ccurate knowledge of the anatomy of the cardiac conducion system in congenitally corrected transposition of the reat arteries is a prerequisite for intracardiac electrophysilogic procedures in patients with this congenital cardiac alformation. Several excellent histopathologic and intraperative descriptions are available; however, electrohysiologic mapping data are scant. We describe intracariac electroanatomic mapping of the conduction system and adiofrequency ablation of the atrioventricular (AV) conuction in a patient with corrected transposition and left undle branch block who required this procedure for treatent of atrial fibrillation with rapid ventricular response.