What is Atrial Fibrillation?

What is atrial fibrillation?

Atrial fibrillation is a rapid electrical activity in the atria, the upper chambers of the heart, with no effective contraction of the upper chambers. 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.