High-Density Electroanatomical Mapping of Alternating Short- and Long-RP Orthodromic Tachycardia With Identical Atrial Breakthrough

Abstract

High-density electroanatomical mapping during orthodromic tachycardia with alternating short- and long-VA conduction patterns demonstrated an identical earliest atrial breakthrough. Although this supports a common atrial insertion, it cannot distinguish functional longitudinal dissociation within a single accessory pathway from closely adjacent ventricular pathway components converging into a common atrial insertion.