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(Circulation. 1958;17:397.)
© 1958 American Heart Association, Inc.

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The Concept of "Masquerading" Bundle-Branch Block

An Electrocardiographic-Pathologic Correlation

PAUL N. UNGER M.D.¹; MILTON E. LESSER M.D.¹; VICTOR H. KUGEL M.D.¹; MAURICE LEV M.D.¹

¹ From the Research Laboratories, the Department of Pathology and the Cardiovascular Division of the Department of Medicine of the Mount Sinai Hospital, Miami Beach, Fla., and the Departments of Pathology and Medicine of the University of Miami School of Medicine, Coral Gables, Fla.

This is a clinicopathologic study of 2 patients who electrocardiographically presented so called "masquerading" bundle-branch block. The conduction systems and the entire hearts of these patients were studied pathologically by methods especially devised by Lev for electrocardiographic correlation. This report is part of a long-term project attempting to ascertain the anatomic substrate of electrocardiographic abnormalities.