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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. The cells that make up the SA node are specialized cardiomyocytes known as pacemaker cells that can spontaneously generate cardiac action potentials.
en.wikipedia.org/wiki/Cardiac_pacemaker
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. The cells that make up the SA node are specialized cardiomyocytes known as pacemaker cells that can spontaneously generate cardiac action potentials.
- 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.
Jul 8, 2023 · A pacemaker is a device used to control an irregular heart rhythm. A pacemaker has flexible wires called leads. The wires are placed in one or more chambers of the heart. They deliver electrical signals to fix the heart rate. Some newer pacemakers don't need wires.
Pacemaker leads contain conductors wrapped in insulation (Figure 2). Most pacemakers utilize bipolar pacing (see below), in which the lead tip is equipped with two electrodes; a positive electrode (anode), and a negative electrode (cathode).
Apr 24, 2023 · Artificial Pacemaker. An artificial pacemaker is a small electrical device commonly fitted to monitor and correct heart rate and rhythm. It is inserted into the chest under the left clavicle, with wires connected to the heart via the venous system. The most common indication for a pacemaker is bradycardia.
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A cardiac pacemaker is a small device implanted in a person’s chest that provides an electrical pulse to the heart, as needed, to regulate a slow heart rate. As people age, some may experience a slower-than-normal heart rate caused by electrical problems or blockages within the heart.
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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.
