is an arrhythmia, or heartbeat abnormality. It occurs when multiple abnormal electrical impulses in the upper chambers of the heart (the atria) fire rapidly at the same time, causing the atria to quiver, or fibrillate.
Atrial fibrillation may interfere with the heart’s ability to fill with blood and pump normally. This, in turn, may prevent the body from receiving the necessary supply of blood and oxygen.
Atrial fibrillation affects more than 2 million Americans, and each year more than 150,000 people are newly diagnosed. It is the most common cause of stroke.
Atrial fibrillation is a condition in which the heart beats in an irregular pattern. It is caused by a problem in the heart's electrical pathways. It can be a sign of heart disease or other health problems that affect the heart.