sinoatrial node

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Related to sinoatrial: sinoatrial block

sinoatrial node

[¦sī·nō′ā·trē·əl ′nōd]
(anatomy)
A bundle of Purkinje fibers located near the junction of the superior vena cava with the right atrium which acts as a pacemaker for cardiac excitation. Abbreviated SA node. Also known as sinoauricular node.
References in periodicals archive ?
Arrhythmias were identified as atrial premature beats (APBs), ventricular premature beats, sinoatrial blocks (SABs), atrioventricular blocks (AVBs), or ventricular tachycardia.
When this happens, it can impair the electrical signal in the sinoatrial node and block the atrioventricular node, which conducts electrical signals from the atria to the ventricles.
Although there is no previous report of significant haemodynamic disturbance following PEI for SVH, Ferlitsch and colleagues (10) have reported sinoatrial and atrio-ventricular block in 42% of patients following PEI for hepatocellular carcinoma and attributed the development of heart blocks to vasovagal reactions and the direct effect of ethanol on the sinus node or the right atrial conduction system.
Slow inward current and its role mediating the chronotropic effect of epinephrine in the rabbit sinoatrial node.
Sinus arrest, sinoatrial block with Wenckebach block, and second-degree atrioventricular block also have been described with TPP.
Cerebyx is contraindicated in patients with slow heart rate, sinoatrial block, second- and third-degree AV block and Adams-Stokes syndrome (blockages of electrical impulses that regulate heartbeat).
Cardiovascular Conditions: NAMZARIC may have vagotonic effects on the sinoatrial and atrioventricular nodes manifesting as bradycardia or heart block.
Nonconducted atrial premature complexes after every second QRS AV indicates atrioventricular; SA, sinoatrial.
In parallel studies, we determined the intrinsic properties of identified cardiac vagal neurons, retrogradely labeled with a fluorescent dye applied to the sinoatrial node.
This results in systemic and coronary artery vasodilation, decreased myocardial contractility, and sinoatrial (SA) and atrioventricular (AV) nodal depression.
The possible causes of tachyarrhythmia and bradyarrhythmia following the Fontan procedure may include damage to the sinoatrial (SA) node or the artery, extensive atrial suture lines and incisions, and exposure of the atrial myocardium to prolonged high pressure.