KAIM, R.M.L., ET AL.: Transient Right Bundle Branch Block Causing R Wa
ve Attenuation Postdefibrillation, Transient and significant decrease
in R wave amplitude, associated with transient right bundle branch blo
ck, was noted to occur after defibrillation in a defibrillator patient
. The mechanism is probably stunning of the right bundle branch, causi
ng right intraventricular conduction delay and decrease in signal ampl
itude reaching the endocardial sensing dipoles.