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atrioventricular extrasystole

n.
  1. A premature contraction of the heart in which the stimulus arises from either the A-V node or A-V bundle.A-V extrasystole
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.