intra-atrial block in·tra-a·tri·al block (ĭn'trə-ā'trē-əl)
Impaired conduction of a nerve impulse through the atria, manifested by widened and often notched P waves.
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|