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Wenckebach period

(vĕnkə-băk′, -bäKH′)
n.
  1. A sequence of cycles in the electrocardiogram ending in a dropped beat due to atrioventricular block, with the preceding cycles showing progressively lengthening P-R intervals; the P-R interval following the dropped beat is again shortened.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.