atrioventricular groove n.
See coronary sulcus.
- Atrioventricular interval
atrioventricular interval atrioventricular interval n. The time from the beginning of atrial systole to the beginning of ventricular systole as measured on an electrocardiogram.
- Atrioventricular nodal extrasystole
atrioventricular nodal extrasystole atrioventricular nodal extrasystole n. A premature beat arising from the A-V node and leading to a simultaneous or almost simultaneous contraction of atria and ventricles. Also called A-V nodal extrasystole, nodal extrasystole.
- Atrioventricular nodal rhythm
atrioventricular nodal rhythm atrioventricular nodal rhythm n. The cardiac rhythm that results when the heart is controlled by the atrioventricular node in which the impulse arises in the atrioventricular node, ascends to the atria, and descends to the ventricles more or less simultaneously. Also called A-V nodal rhythm, nodal bradycardia, nodal rhythm.
- Atrioventricular node
a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart. Abbreviation: A-V node. atrioventricular node n. A small mass of specialized cardiac muscle […]