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interpolated extrasystole

(ĭn-tûrpə-lā′tĭd)
n.
  1. A ventricular contraction that occurs between two normal heartbeats.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.