atrioventricular node

(redirected from AV node)
Also found in: Thesaurus, Medical, Encyclopedia.

atrioventricular node

n.
A small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, that receives electrical impulses from the sinoatrial node and directs them to the conduction system in the walls of the ventricles. Also called A-V node.

a′trioventric′ular node`


n.
a small mass of conducting muscle fibers in the heart, at the base of the right atrium, that transmits heartbeat impulses to the ventricles.
[1930–35]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atrioventricular node - a node of specialized heart muscle located in the septal wall of the right atriumatrioventricular node - 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
cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction
References in periodicals archive ?
The highly unusual pattern of high-grade AVB with an accessory pathway may be simply explained by a block that has occurred in the proximal AV node because these accessory pathways lie directly and distally to the AV node.
Among infants with complete heart block due to neonatal lupus, anti-Ro/SSA and/or anti-La/SSB antibodies bind to fetal cardiac tissue, leading to autoimmune injury of the AV node and its surrounding tissues (4).
"The drugs prevent abnormal activity in the sinus node, or slow or block the transmission of electrical impulses through the AV node," Dr.
The AV node then amplifies the impulse and sends it on its way through the ventricles, stimulating them to contract and propel the blood out of the heart.
Abrupt shortening of the PR interval occurred following a late-coupled spontaneous premature ventricular complex (PVC) consistent with retrograde concealed conduction into the AV node facilitating antegrade fast pathway conduction on the subsequent beats.
The right coronary artery supplies the AV node through AV branch13, therefore associated with a variety of conduction disturbances14,15.
Another important consideration is that AV node is displaced posteroinferiorly.6 Partial atrioventricular septal defect repairs can result in various possible complications like mitral valve insufficiency, complete atrioventricular node block requiring pacemaker and left ventricular outflow tract obstruction.7
A less likely explanation is that the 2:1 AV block is above the bifurcation of the His bundle, e.g., in the AV node, in a patient who also has right bundle branch block.
The AV node sends a signal to make the ventricles contract, which pumps blood out to the lungs and the rest of the body.
AV node receives blood supply from LAD from first perforator artery and AV nodal artery which originates from either RCA or Lcx.
AVJRT can be due to atrioventricular nodal re-entrant tachycardia (AVNRT), where the antegrade limb is the slow pathway of the atrioventricular (AV) node and the retrograde limb the fast pathway, or atrioventricular re-entrant tachycardia (AVRT), where the antegrade limb is the AV node and the retrograde limb is the accessory pathway ('orthodromic' AVRT).
The mass has a broad base, attached to the interatrial septum at the area of AV node region.