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By Mayo Clinic staffDuring atrial fibrillation, the heart's two upper chambers (the atria) beat chaotically and irregularly — out of coordination with the two lower chambers (the ventricles) of the heart. Atrial fibrillation is an irregular and often rapid heart rate that commonly causes poor blood flow to the body and symptoms of heart palpitations, shortness of breath and weakness.
Atrial fibrillation can also cause fatigue and stroke. It's often caused by changes in your heart that occur as a result of heart disease or high blood pressure. Episodes of atrial fibrillation can come and go, or you may have chronic atrial fibrillation.
Although atrial fibrillation itself usually isn't life-threatening, it is a medical emergency. It can lead to complications. Treatments for atrial fibrillation may include medications and other interventions to try to alter the heart's electrical system.
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