Atrioventricular Block, Type II (Mobitz)—Its Nature and Clinical Significance

Abstract

THE USE OF artificial pacing has greatly intensified interest in chronic A-V block.This interest, in turn, has brought into sharp focus the rare type of A-V block described independently in 1906 by Wenckebach' and by Hay2 and classified by Mobitz in 1924 as type 11.3This type of block is characterized by failure of a ventricular response, without antecedent progressive lengthening of A-V conduction time.Furthermore, in its more advanced form several consecutive atrial im-