Atrial fibrillation is a medical condition which causes the heart to beat irregularly. In most cases, this also means the heart beats much faster than usual. It can be life-threatening, as it can cause blood clots, strokes, and heart failure. 

Atrial fibrillation may ocurr intermittently, or permanently. It is treated by medication and electric shocks.

Symptoms may include feelings of a fast or fluttering heartbeat, shortness of breath, diziness, and fatigue, among others. Some peoplde don't experience any symptoms at all.

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