What Is the Atrioventricular Node?

The atrioventricular node is located below the right atrium side of the atrioventricular subendocardium, anterior and superior to the coronary sinus, and is flat oval, smaller than the sinoatrial node. Its function is to transmit the impulses from the sinoatrial node to the ventricle, and the impulses make a short delay in the node, so that the atrial and ventricular muscles do not contract at the same time. Under normal circumstances, the AV node does not independently produce impulses, but when the sinus node function is impaired, the AV node can also produce impulses. ^[1]

AV node

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The atrioventricular node is located below the right atrium side of the atrioventricular subendocardium, anterior and superior to the coronary sinus, and is flat oval, smaller than the sinoatrial node, and the anterior lower end of the node continues as the atrioventricular bundle. Its function is to transmit the impulses from the sinoatrial node to the ventricle, and the impulses make a short delay in the node, so that the atrial and ventricular muscles do not contract at the same time. Under normal circumstances, the AV node does not independently produce impulses, but when the sinus node function is impaired, the AV node can also produce impulses. ^[1]

Chinese name

AV node

Foreign name

atrio-ventricular node, auriculo- ventricular node

lie in

Deep endocardial plane

Name

Tian Yuanchun (1905) first reported

V node Tahara Jun (1905) was the earliest reported, so it is also called Tahara knot. It is a special myocardium of the mammalian heart and is the starting part of the atrioventricular conduction system. It is located near the coronary sinus opening in the dorsal wall of the right atrium and connects the atrioventricular bundle. The shape of the muscle fibers is less regular and thinner than the inherent myocardial fibers. There are many blood vessels and nerve fibers around it. The excitement of the atrium reaches here, and then further through the atrioventricular bundle to Pukinye's fibers. Under normal circumstances, the activity of the ministry is caused by atrial excitement, but when the atrial does not excite, the part can also periodically find spontaneous excitement. This is the second impulse, but its conduction velocity is quite slow.

The myocardial pacing point is in the sinoatrial node. If the sinoatrial node is not working, it can be paced from the atrioventricular node. There was a patient who had survived the atrioventricular node pacing more than ten times when the sinoatrial node was not working. Years, but the heartbeat is much slower.