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(Chest. 1971;59:333-335.)
© 1971 American College of Chest Physicians

Nonparoxysmal Bidirectional Rhythm

Michael C. Proper M.D.1; Norman Terry Ditchek M.D.2; Anthony D. Purcell M.D.3; and Morris H. Smith Jr. M.D.4

1 Departments of Medicine, Veterans Administration Hospital and University of Miami School of Medicine, Miami, Florida
2 Resident in Medicine, University of Miami School of Medicine
3 University of Miami School of Medicine
4 Instructor in Medicine, University of Miami School of Medicine

A bidirectional slow ventricular rhythm was observed in a 61-year-old man with acute myocardial infarction. The ventricular origin of this arrhythmia was suggested by the presence of fusion beats. Moreover, it was different from other types of bidirectional tachycardias in that the rate was below 100/min and because digitalis could not be incriminated as a causal factor. It was possible that this bidirectional tachycardia could have been due to the presence of two ventricular foci—one in the superior and the other in the inferior divisions of the left branch respectively.






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Copyright © 1971 by the American College of Chest Physicians.