INTERMITTENT AND TRANSIENT BUNDLE BRANCH BLOCK: A CLINICAL AND ELECTROCARDIOGRAPHIC STUDY

Abstract

Shortly after the recognition of the pattern of bundle branch block in the animal and human electrocardiogram,¹ it was demonstrated that such patterns were often associated with lesions of one or both branches of the bundle of His.² Many investigators demonstrated that the presence of bundle branch block in the electrocardiogram was generally associated with a diseased heart.^{3, 4} Although many reports of bundle branch block have appeared in otherwise normal persons,^{5, 6} the majority of patients showing this pattern have definite cardiac involvement.^{7, 8} The nature and significance of transient or paroxysmal bundle branch block were not clearly