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What is Atrial Fibrillation? | Who has AF? | What are the symptoms of AF? | How is AF Diagnosed?
 
WHAT IS ATRIAL FIBRILLATION?  

With atrial fibrillation ("AF"), the heart’s two small upper chambers (the atria) quiver instead of beating effectively. This quivering action prohibits blood from pumping completely out of these chambers and into the other chambers of the heart.  Consequently, proper movement of blood through the body is inhibited.  As a result, the blood may pool or clot. If a piece of a blood clot in the atria leaves the heart and becomes lodged in an artery in the brain, a stroke results. About 15 percent of strokes occur in AF patients.