Abstract
This article presents the case of a 40-year-old man who underwent catheter ablation for narrow complex tachycardia with ventriculoatrial (VA) block. The differential diagnosis for this rare arrhythmia included junctional tachycardia, atrioventricular nodal reentry tachycardia with upper common pathway block, and circus movement tachycardia (CMT) utilizing a concealed nodofascicular/nodoventricular accessory pathway. Pacing maneuvers were used to demonstrate that the tachycardia mechanism was CMT utilizing a concealed nodofascicular accessory pathway. Methods of diagnosis, mapping, and ablation of narrow complex tachycardia with VA block are presented and discussed.
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