![]() ![]() During atrial fibrillation, heartbeat signals begin in many different locations in the atria rather than in the sinus node. Atrial fibrillation - This is a supraventricular arrhythmia that causes a rapid and irregular heartbeat, during which the atria quiver or "fibrillate" instead of beating normally. ![]() In most cases, the problem is either an abnormality in the A-V node or an abnormal pathway that bypasses the typical route for heartbeat signals.
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