Aetiology of bundle-branch block.

Abstract

For 5 yr. 161 cases of bundle-branch block were studied. Details of age, sex, and etiological background of both types of bundle-branch block were presented. Coronary heart disease and hypertension were closely associated with both forms. An unusually high incidence of chronic respiratory disease was noted, particularly in subjects with right bundle-branch block. This association with chronic respiratory disease is briefly discussed.