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Article
May 1941

LIFE EXPECTANCY IN CONDUCTIVE DISTURBANCES AFFECTING THE VENTRICULAR COMPLEX OF THE ELECTROCARDIOGRAM: II. SPECIAL CONSIDERATION OF BUNDLE BRANCH BLOCK WITH CONCORDANT GRAPHS AND WITH DISCORDANT GRAPHS

Author Affiliations

Fellow in Medicine, the Mayo Foundation; ROCHESTER, MINN.

From the Section on Cardiology, the Mayo Clinic (Drs. Willius and Dry).

Arch Intern Med (Chic). 1941;67(5):1027-1033. doi:10.1001/archinte.1941.00200050135009
Abstract

The reasons for the reclassification of bundle branch lesions, as indicated elsewhere,1 center chiefly around the histopathologic studies of Yater and his co-workers2 and of Mahaim,3 who have indicated, first, that the fibrotic changes in the conduction system which are responsible for the electrocardiographic pattern of bundle branch block are usually bilateral, though one branch is liable to show destructive effects to a more advanced degree than the other; second, that when the brunt of the destructive changes is borne by the left branch, the etiologic factor concerned is usually coronary disease or hypertension, whereas the reverse is true most generally when the heart is the seat of a chronic rheumatic lesion; third, that the amplitude of the ventricular complexes does not seem, according to Yater's observations, to be entirely dependent on the state of the bundle branches as these are found in serial sectional studies; fourth,

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