intra-atrial block

[ ĭn′trə-ātrē-əl ]

n.

Impaired conduction of a nerve impulse through the atria, manifested by widened and often notched P waves.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.