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Sinoatrial node
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- The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac muscle on the wall of the upper right atrium near to the superior vena cava entrance.
en.wikipedia.org/wiki/Cardiac_pacemaker
In most humans, these cells are concentrated in the sinoatrial (SA) node, the primary pacemaker, which regulates the heart’s sinus rhythm. Sometimes a secondary pacemaker sets the pace, if the SA node is damaged or if the electrical conduction system of the heart has problems.
- Sinus Pause and Arrest
- SA Nodal Exit Block
- Abnormal Sinus Rhythms
- Wandering Atrial Pacemaker
This condition happens when the SA node does not initiate the electrical impulse that leads to a heart contraction. A pause or arrest can last a few seconds to several minutes. A pause of a few seconds does not always produce symptoms. A longer pause can result in: 1. dizziness 2. lightheadedness 3. fainting In some cases, this condition can even b...
An SA nodal exit block happens when the SA node initiates the electrical impulse, but the impulse does not reach the neighboring tissue in the right atrium. Therefore, the heart does not receive the signal to contract. This causes a pause in the heartbeat.
Abnormal sinus rhythms are small variations in heart rhythms. They occur more frequently in younger people or those who use morphineor a drug called digoxin. If a person uses digoxin, abnormal sinus rhythm may result from digoxin toxicityTrusted Sourceand require treatment. People in this situation should contact a healthcare professional as soon a...
A wandering atrial pacemaker describes a situation where the pacemaker function of the heart comes from different locations in the right atrium rather than the SA node. This condition is usually asymptomatic and typically does not require treatment.
What part of the heart's conduction system acts as the primary pacemaker? Click the card to flip 👆. SA node. Click the card to flip 👆. 1 / 17. Flashcards. Learn. Test. Match. Q-Chat. bthyen04. Created 1 week ago. Students also viewed. world history unit 3. 88 terms. mickier. Preview. Female Pelvis - Posterior View. 11 terms. yeeeewaa. Preview.
Structure and Function. The heart is subdivided by septa into right and left halves, and a constriction subdivides each half of the organ into two cavities, the upper cavity being called the atrium, the lower the ventricle. The heart, therefore, consists of four chambers: right atrium. left atrium. right ventricle. left ventricle [6].
Aug 17, 2023 · Although all parts have the ability to generate action potentials and thus heart contractions, the sinuatrial (SA) node is the primary impulse initiator and regulator in a healthy heart. This aspect makes the SA node the physiological pacemaker of the heart.
The impulses originate in the heart's natural pacemaker (the sinus or sinoatrial node—a small mass of tissue in the wall of the right atrium), which generates a tiny electrical current.
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May 15, 2022 · The S-A node is also called the pacemaker because it establishes the basic frequency at which the heart beats. The interior of the fibers of heart muscle, like all cells, is negatively charged with respect to the exterior.
