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(Chest. 1971;60:499-502.)
© 1971 American College of Chest Physicians

Intermittent Left Posterior Hemiblock

M. Susana Halpern M.D.1; Gerardo J. Nau M.D.1; Raul J. Levi M.D.1; and Mauricio B. Rosenbaum M.D.2

1 Staff, Cardiology Service, Hospital Salaberry
2 Chief of Cardiology, Hospital Salaberry

A 45-year-old woman with cardiomyopathy of unknown nature developed a pattern of intermittent left posterior hemiblock (LPH), in the presence of atrial fibrillation. The conduction disturbance was rate dependent, different degrees of LPH were documented, and the duration of recovery in the posterior division of the left bundle branch changed from day to day. The problem of complete versus incomplete LPH is discussed. LPH shifts the AQRS direction inferiorly and to the right, the initial QRS forces superiorly and to the left, and increases the QRS interval no more than 0.02 sec. So far as we were able to determine, this is the first reported case of pure, intermittent LPH.






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Copyright © 1971 by the American College of Chest Physicians.