Atrial fibrillation happens when electrical signals misfire and cause the upper chambers of the heart (the atria) to contract in a fast and irregular manner. To learn more about atrial fibrillation, visit www.heartofstroke.com ©focus-AF Limited 2011: permission granted for educational purposes only
Tags: atrial fibrillation heart, afib heart, af, stroke, atrial fibrillation, Boehringer Ingelheim
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