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intra-atrial block

(ĭn′trə-ātrē-əl)
n.
  1. Impaired conduction of a nerve impulse through the atria, manifested by widened and often notched P waves.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.