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isoelectric period

n.
  1. The period in the electrocardiogram between the end of the S wave and the beginning of the T wave, during which electrical forces neutralize each other so that there is no difference in potential under the two electrodes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.