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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]
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.
[1] [5] People with TIC may have symptoms associated with heart failure (e.g. shortness of breath or ankle swelling) and/or symptoms related to the tachycardia or arrhythmia (e.g. palpitations). [1] [2] Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease. [5] [1]
Atrial fibrillation (A-fib). An irregular and often very fast heart rate. ... Not all arrhythmias require treatment, but some can lead to complications such as a heart attack or stroke. Treatment ...
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 ...
In Europe and North America, as of 2014, atrial fibrillation affects about 2% to 3% of the population. [50] Atrial fibrillation and atrial flutter resulted in 112,000 deaths in 2013, up from 29,000 in 1990. [26] Sudden cardiac death is the cause of about half of deaths due to cardiovascular disease or about 15% of all deaths globally. [51]
In atrial fibrillation, [13] the left atrial appendage fibrillates rather than contracts resulting in blood stasis that predisposes to the formation of blood clots. [9] Because of consequent stroke risk, surgeons may choose to close it during open-heart surgery, using a left atrial appendage occlusion procedure. [18]
The heart has four chambers, two upper chambers—the right and left atrium, and two lower chambers—the right and left ventricles. Fibrillation describes when the muscle fibers are all contracting at different times, so the end result is this quivering, or twitching movement.