atrioventricular node


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atrioventricular node

[¦ā·trē·o‚ven¦trik·yə·lər ′nōd]
(anatomy)
A group of slow-conducting fibers in the atrium of the vertebrate heart that are stimulated by impulses originating in the sinoatrial node and conduct impulses to the bundle of His.
References in periodicals archive ?
Cystic tumor of the atrioventricular node of the heart appears to be the heart equivalent of the solid cell nests (ultimobranchial rests) ofthe thyroid.
Patients with right ventricular infarction due to RCA occlusion have a poor prognosis and a high risk of disturbances in conduction at the atrioventricular node. Identification of the occluded vessel by using ECG signs and their validation can help in planning the PCI procedure and stratifying risk.
Last month, the Food and Drug Administration approved the Freezor Cryoablation System specifically for treatment of atrioventricular node reentry tachycardia (AVNRT).
The literature contains a case report of aortic valve PFE coincident with a cystic tumor of the atrioventricular node.[9] Our case showed coincident PFE and thymoma.
Five pigs were treated with a modified adenovirus containing the gene that codes for the inhibitory G protein, a protein that is active in the heart's atrioventricular node and helps control heartbeat.
The lengthening of the PR interval may indicate an infrahisian conduction disorder located on the right bundle or a delay in the atrioventricular node [5].
In addition, some researchers suggested that patients with a PLSVC may become symptomatic due to arrhythmias through stretching of the atrioventricular node or His bundle by the dilated coronary sinus.
Accelerated junctional rhythm may arise in atrial tissue proximal to the atrioventricular node, in the atrioventricular node itself, or in the His bundle and is the result of enhanced automaticity.
With the exception of endodermal heterotopia of the atrioventricular node, primary cardiac tumors rarely cause sudden death.[1] Among benign primary cardiac tumors, paraganglioma, a neuroendocrine neoplasm that arises from the extra-adrenal paraganglia of the autonomic nervous system, accounts for less than 1%.[2,3] The sites of origin in the heart parallel the anatomic distribution of visceral autonomic paraganglionic tissue, chiefly arising from the roof of the atria and atrial septum and from the branchiomeric aortopulmonary paraganglia.
The association of complete AV block and TCM remains a conundrum because the damaged apical ventricle is some distance away from the conduction pathways in the atrium, bundle of His, atrioventricular node, and intrahisian region [3].

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