LAUSR

In adenosine-sensitive AT cases, noncoronary aortic sinus (NCS) could be a target for ablation even if the NCS is not activated the earliest because there may be cases in which the NCS is located at the entrance of the SCZ. Introduction Adenosine-sensitive atrial tachycardias (ATs) originating from the atrioventricular (AV) node vicinity have been reported, and the mechanism responsible is considered to be reentry. Previous reports have demonstrated manifest entrainment from the right atrium (RA) or mitral annulus (MA) during these ATs, and most of them could be ablated safely at the entrance of the slow conduction zone (SCZ), indicated by a manifest entrainment-guided strategy. We describe a case of adenosine-sensitive AT originating from the para-Hisian region that could be ablated at the entrance of the SCZ, indicated by the demonstration of manifest entrainment from the noncoronary aortic sinus (NCS).