Introduction
The mechanism responsible for adenosine-sensitive atrial tachycardias (ATs) originating from vicinity of the atrioventricular (AV) node has been considered to be reentry1, and they could be ablated safely at the entrance of the slow conduction zone (SCZ) remote from the His bundle region, indicated by a manifest entrainment-guided strategy.2,3 In this strategy, manifest entrainment is defined by the orthodromic capture of the electrogram at the earliest activation site (EAS) with a long conduction time by the immediately previous pacing impulse (n-1), and the antidromic capture of other sites by the immediate impulse (n) in one paced beat except for the last entrained beat, equivalent to constant fusion. We described a case of adenosine-sensitive AT originating from the para-Hisian region that could be eliminated at a remote site from the EAS indicated by the demonstration of manifest entrainment from the anteroseptal left atrium (LA).