Atrial fibrillation (AFib) is a type of irregular heartbeat, specifically affecting the atria, the two upper chambers of the heart. In a healthy heart, the atria and ventricles (lower chambers) work in a coordinated manner, guided by electrical signals. In AFib, these electrical signals go haywire, causing the atria to quiver or fibrillate instead of contracting properly. This disrupts the normal flow of blood into the ventricles and subsequently to the rest of the body.
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