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Atrial fibrillation is associated with an increased risk of heart failure, dementia, and stroke. [3] [12] It is a type of supraventricular tachycardia. [14] Atrial fibrillation frequently results from bursts of tachycardia that originate in muscle bundles extending from the atrium to the pulmonary veins. [15]
In the normal heartbeat, a well-coordinated atrial contraction does contributes a small amount of blood that’s called the “atrial kick”, people with AF lose this atrial kick, although this loss isn’t life-threatening. Okay but how or why does this happen in the atrium? Why do the cells start depolarizing in a totally uncoordinated way?
There are two major classes of cardiac fibrillation: atrial fibrillation and ventricular fibrillation. Atrial fibrillation is an irregular and uncoordinated contraction of the cardiac muscle of atria. It can be a chronic condition, usually treated with anticoagulation and sometimes with conversion to normal sinus rhythm.
Atrial fibrillation: Red dots show atrial fibrillation activity. Atrial fibrillation meets the definition of SVT when associated with a ventricular response greater than 100 beats per minute. It is characterized as an "irregularly, irregular rhythm" both in its atrial and ventricular depolarizations and is distinguished by its fibrillatory ...
Fibrillation can affect the atrium (atrial fibrillation) or the ventricle (ventricular fibrillation): ventricular fibrillation is imminently life-threatening. Atrial fibrillation affects the upper chambers of the heart, known as the atria. Atrial fibrillation may be due to serious underlying medical conditions and should be evaluated by a ...
Atrial fibrillation represents an electrically disordered but well perfused atrial mass working (in an uncoordinated fashion) with a (comparatively) electrically healthy ventricular systole. The compromised load caused by atrial fibrillation detracts from the overall performance of the heart, but the ventricles continue to work as an effective ...
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