AV (atrioventricular)

AV (atrioventricular): AV is the standard medical abbreviation for atrioventricular, a combination that means pertaining to the atria (the upper chambers of the heart) and the ventricles (the lower chambers of the heart). For example, the AV node is an electrical relay station between the atria and the ventricles. Electrical signals from the atria ...
Found on http://www.medterms.com/script/main/art.asp?articlekey=8527
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