title: Additional evidence for re-entry within the bundle branches in man.
abstract: A repetitive, non-paced ventricular beat (V3) often occurs during ventricular extrastimulus testing at short coupling intervals when critical retrograde His-Purkinje conduction delay is achieved. Though re-entry within the bundle branches has been proposed as the mechanism for V3, it has been difficult to exclude local re-entry. In the present case, we consistently recorded a right bundle branch potential as well as a bundle of His potential before each V3. The anterograde activation sequence of these potentials provides evidence against local re-entry and supports re-entry involving the bundle branches as the mechanism for V3.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D002036:Bundle of His / Q000503:physiopathology*; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged