what is av stand for medical?
<answer> Atrioventricular <context> Medical Definition of Node, AV. Node, AV: AV node: The AV node (AV stands for atrioventricular) is an electrical relay station between the atria (the upper) and the ventricles (the lower chambers of the heart). Electrical signals from the atria must pass through the AV node to reach the ventricles.