Because the atria set the pace for the heart beat, atrial fibrillation is much more life threatening than ventricular fibrillation.

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Ventricular fibrillation is much more life threatening than atrial fibrillation because it can quickly lead to cardiac arrest and death if not treated immediately. Ventricular fibrillation occurs when the heart's lower chambers quiver instead of pump blood effectively, while atrial fibrillation refers to irregular contractions of the upper chambers of the heart.

Because the Atria Set the Pace for the Heart Beat