Fasciculoventricular Preexcitation - A Case Report

Fasciculoventricular accessory pathway is a rare preexcitation and connects the His bundle to the adjacent ventricular myocardium. Although its inherent rheological and electrophysiologic properties do not cause any tachycardia, its presence as a bystander during other tachyarrhythmias may be challenging for electrophysiologists in differential diagnosis. We present a patient with an atrioventricular nodal reentrant tachycardia and a bystander fasciculoventricular accessory pathway. The slow pathway was ablated successfully and some diagnostic criteria have been proposed with the review of the related literature. Although the diagnosis of the fasciculoventricular accessory connection is relatively easy and it does not cause any tachycardia, electrophysiologists should be able to recognize the preexcitation. (Türk Kardiyol Dern Arş 2004; 32: 318-321)