Information About Atrial Fibrillation

(also known as AF)

Atrial fibrillation, or AF, is the most common type of arrhythmia, or problem with the rate or rhythm of the heartbeat. AF occurs if rapid, disorganized electrical signals cause the heart's two upper chambers -- call the atria -- to fibrillate, or contract very fast and irregularly. Read More...

AF occurs if rapid, disorganized electrical signals cause the heart's two upper chambers—called the atria (AY-tree-uh)—to fibrillate. The term "fibrillate" means to contract very fast and irregularly.

In AF, blood pools in the atria. It isn't pumped completely into the heart's two lower chambers, called the ventricles (VEN-trih-kuls). As a result, the heart's upper and lower chambers don't work together as they should.

People who have AF may not feel symptoms. However, even when AF isn't noticed, it can increase the risk of stroke. In some people, AF can cause chest pain or heart failure, especially if the heart rhythm is very rapid.

AF may happen rarely or every now and then, or it may become an ongoing or long-term heart problem that lasts for years.



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