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Atrial fibrillation

Atrial fibrillation is an irregular and often rapid heart rate that occurs when the two upper chambers of your heart experience chaotic electrical signals. The result is a fast and irregular heart rhythm. The heart rate in atrial fibrillation may range from 100 to 175 beats a minute.

This condition may have no symptoms, but when symptoms do appear they include palpitations, shortness of breath and fatigue.
Treatments include drugs, electrical shock (cardioversion) and minimally invasive surgery (ablation).