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Circulation. 1970;42:1135-1142

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(Circulation. 1970;42:1135.)
© 1970 American Heart Association, Inc.

Right Bundle-Branch Block Associated with Left Superior or Inferior Intraventricular Block

Associated with Acute Myocardial Infarction

PATRICK J. SCANLON M.D.1; RAY PRYOR M.D.1; S. GILBERT BLOUNT JR. M.D.1

1 From the Division of Cardiology, Department of Medicine, University of Colorado Medical Center, Denver, Colorado.

Over an 11-year period, 28 instances of acute myocardial infarction and bilateral bundle-branch block were encountered. Twenty-two of these patients had right bundle-branch block and left axis deviation, and six had right bundle-branch block and block of the inferior radiation of the left bundle. The overall incidence of complete heart block in these 28 cases was 21%. In-hospital mortality for the whole group was 36%, whereas it was 33% for those patients who developed complete heart block. From these results it is concluded that for the patient with bilateral bundle-branch block and acute myocardial infarction the prophylactic insertion of a temporary transvenous pacemaker is not only warranted, but is probably indicated.


Key Words: Bilateral bundle-branch block • Complete heart block • Intraventricular block • Myocardial infarction • Right bundle-branch block

Submitted on May 26, 1970
Accepted on July 17, 1970




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