Atrial fibrillation vs, ventricular fibrillation?

which one is more serious? please explain to the point. thanks.

Atrial fibrillation is uncoordinated beating at the top of the heart. Ventricular fibrillation is uncoordinated beating of the lower chambers.

Atrial fibrillation is generally moderately harmless, although it can lead to an increase in the risk of stroke. Ventricular fibrillation interferes with the normal pumping action of the heart, and is therefore much more serious.

When the ventricles fibrillate fast, they do not fill with blood normally, and this causes anoxia. When the atria fibrillate, the ventricles still fill and supply blood to the brain and body.

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