Final answer:
Atrial fibrillation is treated with defibrillation, which stops the heart briefly to reestablish a normal sinus rhythm.
Step-by-step explanation:
Atrial fibrillation is a condition where the heart beats in a wild, uncontrolled manner due to disruption of its electrical activity. The most common treatment for atrial fibrillation is defibrillation, which involves using special paddles to apply a charge to the heart from an external electrical source. This charge stops the heart temporarily, allowing the SA node to trigger a normal conduction cycle and reestablish a normal sinus rhythm.