title: Transient right bundle branch block causing R wave attenuation postdefibrillation.
abstract: Transient and significant decrease in R wave amplitude, associated with transient right bundle branch block, was noted to occur after defibrillation in a defibrillator patient. The mechanism is probably stunning of the right bundle branch, causing right intraventricular conduction delay and decrease in signal amplitude reaching the endocardial sensing dipoles.
authors.affiliation: Cardiac Unit, Massachusetts General Hospital, Boston 02114, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Kam
authors.forename: H
authors.initials: H
authors.lastname: Garan
authors.forename: B A
authors.initials: BA
authors.lastname: McGovern
authors.forename: J N
authors.initials: JN
authors.lastname: Ruskin
authors.forename: J W
authors.initials: JW
authors.lastname: Harthorne
mesh_terms: D002037:Bundle-Branch Block / Q000209:etiology* / Q000503:physiopathology; D017147:Defibrillators, Implantable; D004554:Electric Countershock; D004562:Electrocardiography; D004699:Endocardium / Q000294:innervation; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction; D014693:Ventricular Fibrillation / Q000628:therapy; D016278:Ventricular Function, Right