title: Bundle branch block in alternate beats: the role of supernormal and concealed bundle branch conduction.
abstract: This article reports an example of right bundle branch block occurring on alternate beats in the presence of atrial tachycardia with 2:1 atrioventricular conduction. Analysis of the tracing suggests that the alternate disappearance of right bundle branch block is a manifestation of supernormal bundle branch conduction. The phenomenon is assumed to be caused by retrograde concealed conduction within the bundle branch that is blocked in anterograde direction (the "linking" mechanism).
authors.affiliation: Department of Clinical Medicine, University of Messina, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Luzza
authors.forename: A
authors.initials: A
authors.lastname: Consolo
authors.forename: G
authors.initials: G
authors.lastname: Oreto
mesh_terms: D000368:Aged; D001282:Atrial Flutter / Q000175:diagnosis / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D014630:Vagus Nerve / Q000503:physiopathology