Transient right bundle branch block causing R wave attenuation postdefibrillation.
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.
Kam
R M
RM
Cardiac Unit, Massachusetts General Hospital, Boston 02114, USA.
Garan
H
H
McGovern
B A
BA
Ruskin
J N
JN
Harthorne
J W
JW
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