in 200 successive patients undergoing his bundle electrography and atrial stimulation the indication was as follows : intraventricular conduction defects in 24 % , a-v block in 21 % , sick sinus syndrome in 20 % , preexcitation in 17 % , and complex arrhythmias in the remaining cases .
C0032915
preexcitation
C0003811
arrhythmias