Omega-3 fatty acids in the prevention of atrial fibrillation recurrences after cardioversion: a meta-analysis of randomized controlled trials.

BACKGROUND: Previous randomized studies have reported conflicting results on the efficacy of omega-3 fatty acids in preventing atrial fibrillation (AF) recurrences after cardioversion. OBJECTIVE: A systematic review and meta-analysis of the role of omega-3 fatty acids in the prevention of atrial fibrillation recurrences after cardioversion was conducted. METHODS: PubMed, Cochrane Library, Elsevier, Science Online database were searched up to the end of January 2012 to identify all of the studies in human subjects that reported the effects of omega-3 fatty acids on the prevention of atrial fibrillation recurrences after cardioversion. RESULTS: Overall, omega-3 fatty acids had no significant effect on the prevention of AF recurrences after cardioversion (OR: 0.63,95% CI 0.35-1.13; p=0.12). The heterogeneity among the studies was significant (p=0.01, I(2)=66%). Subgroup analysis showed that by administering omega-3 fatty acids at least 4 weeks prior to cardioversion and continuing thereafter, the recurrence rate of AF is significantly low (OR: 0.39, 95% CI 0.25-0.61; p<0.0001). CONCLUSION: In the subgroup administered omega-3 fatty acids at least 4 weeks prior to cardioversion and continued thereafter, the recurrence rate of AF was significantly low. More double-blind, randomized, placebo-controlled, multicenter studies with high quality and longer follow-up periods are needed to affirm our conclusion.