What Is AF?
 
Atrial fibrillation (AF) is the most common heart arrhythmia in Western countries and occurs mostly in the elderly.  AF produces a rapid and irregular heartbeat, during which the atria (the upper two chambers of the heart that receive blood) quiver, or fibrillate, instead of beating normally.

Because the rapid and irregular heartbeat produced by AF cannot pump blood out of the heart efficiently, blood tends to pool in the heart chambers.  This increases the risk of blood clot forma...
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