This causes the ventricles to beat more rapidly than normal, resulting in a rapid or irregular pulse . The ventricles may fail to pump enough blood to meet the needs of the body. Some cases have no identifiable cause. Atrial fibrillation or flutter affects about 5 out of 1000 people. It can affect either sex.
Atrial fibrillation is very common in the elderly, but it can occur in persons of any age.
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