September 17th 2008
We performed a meta-analysis of the effect of long-term treatment with antiarrhythmic drugs for the prevention of recurrent atrial fibrillation after conversion to sinus rhythm. We found that several class IA, IC, and III drugs are effective in maintaining sinus rhythm, but virtually all of them increase adverse effects, including proarrhythmia. In addition, class IA drugs are associated with increased mortality. The final risk-benefit ratio of antiarrhythmic drugs on clinically relevant outcomes is still unclear.