There are three general treatments for sudden onset atrial fibrillation: 1. The most common and effective treatment is radiofrequency ablation, through which all ectopic pacing points are burned off, which then plays a role in combating arrhythmias. In new-onset atrial fibrillation, the cure rate of radiofrequency ablation is often between 70% and 80, and once chronic persistent atrial fibrillation develops, the cure rate decreases to about 60%.2. Treatment of sudden-onset atrial fibrillation can also be synchronized with a defibrillator for electrical cardioversion. The first loading dose of amiodarone hydrochloride is usually around 600mg, and the oral dose is maintained for a long period of time, usually around 3-6 months.