Differential response to right ventricular extrastimuli from the base and apex during long RP′ supraventricular tachycardia

Abstract

We report a case of long RP′ tachycardia diagnosed as fast–slow atrioventricular nodal reentrant tachycardia (AVNRT) with a bystander nodoventricular pathway (NVP). Differential responses to right ventricular extrastimuli from the base and apex highlighted the anatomical proximity of the NVP attachment, contributing to the diagnosis.