In atrial fibrillation, the two atria beat irregularly and out of rhythm with the lower ventricles.

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In atrial fibrillation, the electrical signals that control the heartbeat become disorganized, causing the two atria of the heart to quiver or fibrillate instead of contracting normally. As a result, the atria beat irregularly and out of rhythm with the lower ventricles, leading to a range of symptoms and potential complications.

In Atrial Fibrillation, the Two Atria Beat Irregularly and Out