| atrioventricular | (adj) relating to or affecting the atria and ventricles of the heart, Syn. auriculoventricular, Example: atrioventricular disease |
| atrioventricular bundle | (n) a bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contract, Syn. atrioventricular trunk, bundle of His, truncus atrioventricularis |
| atrioventricular nodal rhythm | (n) the normal cardiac rhythm when the heart is controlled by the atrioventricular node, Syn. nodal rhythm |
| atrioventricular node | (n) a node of specialized heart muscle located in the septal wall of the right atrium; receives impulses from the sinoatrial node and transmits them to atrioventricular bundle |
| atrioventricular valve | (n) either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium |
| heart block | (n) recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat, Syn. Adams-Stokes syndrome, Stokes-Adams syndrome, atrioventricular block |
| mitral valve | (n) valve with two cusps; situated between the left atrium and the left ventricle, Syn. bicuspid valve, left atrioventricular valve |
| tricuspid valve | (n) valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to prevent backflow when the ventricle contracts, Syn. right atrioventricular valve |