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P-R interval

n.
  1. The time elapsing between the beginning of the P wave and the beginning of the QRS complex in an electrocardiogram; it corresponds to the atriocarotid interval of the venous pulse.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.