PATHOGENESIS OF BUNDLE BRANCH BLOCK

CONTENTS Introduction Results of physiologic experiments on bundle branch block Types of curves designated by various authors as indicating intraventricular and bundle branch block Review of clinical studies of permanent bundle branch block Transient, intermittent and functional bundle branch block Sudden onset of permanent bundle branch block Progressive bundle branch block Bundle branch block associated with impaired auriculoventricular conduction Ventricular preponderance, ventricular strain and effect of cardiac position on the electrocardiogram Histopathologic studies of bundle branch block reported in the literature Summaries of sixteen cases of bundle branch block studied pathologically Anatomy of the conduction system Histologic technic Report of six cases of bundle branch block with detailed histopathologic study of the conduction system General comments on cases studied histopathologically Coordination of data on bundle branch block Summary and conclusions The original concept of the electrocardiographic manifestations of bundle branch interruption, as developed by Eppinger and Rothberger1(1910) and