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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.
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.
- 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.
Study with Quizlet and memorize flashcards containing terms like What part of the heart's conduction system acts as the primary pacemaker?, Having no nucleus, a biconcave shape, and the function of gas transport would describe a, Transportation functions of the circulatory system include and more.
Jul 22, 2023 · The sinoatrial (SA) node, often referred to as the natural pacemaker of the heart, plays a crucial role in initiating and regulating the electrical impulses that control the heart's rhythm.
May 21, 2024 · The pacemaker monitors the heart’s rhythm and if it detects certain abnormalities, it will generate an electric impulse so the heart can beat with a normal rhythm. For many patients, a pacemaker works only when needed — if the heartbeat gets too slow, it will jump in and correct it.
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Mar 24, 2022 · English. Español. Pacemakers use low-energy electrical pulses to control the rate and rhythm of your heartbeat. Traditional pacemakers send the electrical pulses through wires, also known as leads. Wireless pacemakers are a newer kind of pacemaker without wires.
