intra-atrial block in·tra-a·tri·al block (ĭn'trə-ā'trē-əl)
n.
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. |
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