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(Chest. 1971;59:461-464.)
© 1971 American College of Chest Physicians

Demonstration of the Supernormal Period in the Intact Human Heart as a Result of Pacemaker Failure

David P. Parker M.D.1 and Marvin A. Kaplan M.D.2

1 Assistant Chief, Cardiology Section, Veterans Administration Hospital, Long Beach; Assistant Clinical Professor of Medicine, University of California at Irvine, California College of Medicine
2 Chief, Cardiology Section, Veterans Administration Hospital, Long Beach; Assistant Professor of Medicine, University of California at Irvine, California College of Medicine

A 47-year-old man with a 23-year history of complete heart block and A-V junctional rhythm was treated with a permanent pacemaker employing a demand type pulse generator and a bipolar endocardial electrode in the right ventricle. Fourteen months later the pulse generator showed evidence of failure and it then became possible to demonstrate that pacemaker stimuli could evoke a response only during a 50 millisecond period toward the end of the T wave, this interval being the supernormal period of the heart in this individual.






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Copyright © 1971 by the American College of Chest Physicians.