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pre-ejection period

(prē′ĭ-jĕkshən)
n.
  1. The interval in the electrocardiogram between the onset of the QRS complex and cardiac ejection.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.