Atrial fibrillation is a rapid electrical activity in the atrium with no effective contraction. There is a propensity for clot formation in the fibrillating atrium, which can cause strokes if the clot migrates into the blood vessels of the brain. If atrial fibrillation is not secondary to any heart disease, it is known as lone atrial fibrillation. Lone atrial fibrillation is considered to be a manifestation of sick sinus syndrome.
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