observations suggesting that the proximal his-purkinje system was not a requisite component included ( 1 ) lack of requirement for retrograde his-purkinje delay or bundle branck reentry , or both , for initiation of the tachycardia : ( 2 ) anterograde depolarization of the his bundle during ventricular tachycardial without alteration of the qrs configuration or cycle length ;
C0039231
tachycardia
C0042514
ventricular tachycardial