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electrical alternation

(ĭ-lĕktrĭ-kəl)
n.
  1. A varied alternation in the activity of the heart indicative of myocardial disease as measured by an electrocardiograph.electrical alternans
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.