Abstract
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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