The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall...
24 KB (2,806 words) - 17:50, 24 April 2024
that is initiated in the sinoatrial node. The initial action impulse in a heart is usually formed in the sinoatrial node (SA node) and carried through the...
6 KB (716 words) - 03:39, 20 April 2024
Supraventricular tachycardia (redirect from Sinoatrial node reentrant tachycardia)
in SVT by most sources. Sinoatrial node reentrant tachycardia (SANRT) is caused by a reentry circuit localised to the SA node, resulting in a P-wave of...
32 KB (3,431 words) - 09:32, 6 April 2024
hearts, these cells form the cardiac pacemaker and are found in the sinoatrial node in the right atrium. They produce roughly 60–100 action potentials...
46 KB (5,430 words) - 18:10, 24 April 2024
Sinoatrial arrest is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate the electrical impulses that normally...
3 KB (322 words) - 06:32, 22 January 2024
Bradycardia (section Sinus node)
at various levels: the sinoatrial node, the atrioventricular node, or damage to conduction tissue between or after these nodes. Bradycardia caused by...
35 KB (4,012 words) - 07:40, 6 May 2024
produced by specialized pacemaker cells found within the sinoatrial node and the atrioventricular node. Cardiac muscle is composed of myocytes which initiate...
20 KB (1,882 words) - 21:56, 13 May 2024
Cardiac conduction system (section SA node: P wave)
conduction system of the heart) transmits the signals generated by the sinoatrial node – the heart's pacemaker, to cause the heart muscle to contract, and...
16 KB (1,840 words) - 02:31, 30 January 2024
blood cells Node of Ranvier, periodic gaps in the insulating myelin sheaths of myelinated axons Sinoatrial node and atrioventricular node, specialized...
4 KB (584 words) - 15:12, 23 February 2024
with pacemaker cells in the sinoatrial node, spreads throughout the atrium, and passes through the atrioventricular node down into the bundle of His and...
90 KB (9,968 words) - 19:09, 7 June 2024
The sinoatrial nodal artery, sinoatrial nodal artery or sinoatrial artery is an artery of the heart which supplies the sinoatrial node, the natural pacemaker...
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cells in the sinoatrial node. These generate an electric current that causes the heart to contract, traveling through the atrioventricular node and along...
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Heart block (redirect from Sinoatrial heart block)
Conduction is initiated by the sinoatrial node ("sinus node" or "SA node"), and then travels to the atrioventricular node ("AV node") which also contains a secondary...
10 KB (1,194 words) - 18:14, 7 May 2024
atrioventricular node (AV node), the "junction" between atria and ventricles. Under normal conditions, the heart's sinoatrial node(SA node) determines the...
8 KB (893 words) - 20:57, 7 May 2024
sinoatrial node. Heart cells have the ability to generate electrical activity independent of external stimulation. As a result, the cells of the node...
31 KB (3,906 words) - 16:06, 1 March 2024
Normally, the sinoatrial node (SA node) produces an electrical signal to control the heart rate. The signal travels from the SA node to the ventricles...
15 KB (1,805 words) - 20:34, 30 October 2023
conduction system (and AV node part of it) coordinates myocyte mechanical activity. A wave of excitation spreads out from the sinoatrial node through the atria...
11 KB (1,218 words) - 17:51, 24 April 2024
sinus node or sinoatrial node (SA node). The impulse initially causes both atria to contract, then activates the atrioventricular node (AV node), which...
43 KB (4,757 words) - 01:50, 21 May 2024
physiological pacemaker of the heart is the sinoatrial node. If the sinoatrial node is rendered dysfunctional, the AV node may act as the pacemaker. If both of...
4 KB (371 words) - 13:58, 19 April 2024
Cardiac pacemaker (section Damage to the SA node)
conduction system to produce these impulses synthetically. The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac...
11 KB (1,469 words) - 18:44, 21 May 2024
characterized by premature heartbeats originating in the atria. While the sinoatrial node typically regulates the heartbeat during normal sinus rhythm, PACs...
11 KB (1,161 words) - 18:36, 25 April 2024
venosus will develop into the posterior part of the right atrium, the sinoatrial node and the coronary sinus. The central part of cardiogenic area is in...
24 KB (3,015 words) - 18:56, 20 April 2024
of the sinoatrial node (SA node), and the vagus nerve provides parasympathetic input to the heart by releasing acetylcholine onto sinoatrial node cells...
79 KB (9,196 words) - 01:08, 6 June 2024
portion (sinus venarum) of the internal surface of the right atrium. The sinoatrial node is located within the crista terminalis.: 56 The crista terminalis...
4 KB (448 words) - 21:53, 8 April 2024
Sinus node dysfunction (SND), also known as sick sinus syndrome (SSS), is a group of abnormal heart rhythms (arrhythmias) usually caused by a malfunction...
12 KB (1,188 words) - 11:32, 14 December 2023
lowering of the heart rate. The right vagus branch innervates the sinoatrial node. In healthy people, parasympathetic tone from these sources is well-matched...
27 KB (3,051 words) - 01:55, 8 June 2024
This is different from normal pacemaking activity, where the sinoatrial node (SA node) is responsible for each heartbeat and keeps a steady rate and...
7 KB (843 words) - 09:31, 27 September 2023
the sinoatrial node (SA node) failing to initiate a beat, by a failure of the conductivity from the SA node to the atrioventricular node (AV node), or...
6 KB (742 words) - 13:04, 23 May 2021
the ventricles. These electrical pathways contain the sinoatrial node, the atrioventricular node, and the Purkinje fibers. (Exceptions such as accessory...
20 KB (2,437 words) - 04:50, 20 April 2024
Cardiac physiology (section Sinoatrial (SA) node)
system include the atrial and ventricular syncytium, the sinoatrial node, the atrioventricular node, the bundle of His (atrioventricular bundle), the bundle...
47 KB (5,784 words) - 11:54, 12 June 2023