Intake of very long-chain n-3 fatty acids from fish and incidence of atrial fibrillation. The Rotterdam Study

Background Atrial fibrillation is the most common sustained cardiac arrhythmia. It is a major cause of morbidity and mortality through an increased risk of thromboembolic stroke. Experimental as well as observational evidence suggests that n-3 polyunsaturated fatty acids may have antiarrhythmic effects. The objective of this study was to examine whether high intakes of fish and its very long-chain n-3 fatty acids eicosapentoenoic acid (EPA) plus docosahexaenoic acid (DHA) are associated with risk of incident atrial fibrillation. Methods We used data from the Rotterdam Study, a prospective cohort study. At baseline, dietary intake data were available for 5 184 subjects free from atrial fibrillation. Dietary intake was assessed using a semiquantitative food-frequency questionnaire, and incidence of atrial fibrillation was continuously monitored during follow-up. Cox proportional hazards model (adjusted for lifestyle and disease factors) was used to examine the associations between intakes of EPA plus DHA and of fish with atrial fibrillation. Results After a mean follow-up of 6.4 (+/- 1.6) years, 312 subjects developed atrial fibrillation. Intake of EPA and DHA in the third textile compared with first was not associated with risk of atrial fibrillation (relative risk 1.18, 95% Cl 0.88-1.57). Furthermore, no association was observed with intake of > 20 g/d fish compared with no fish intake (relative risk 1.17, 95% Cl 0.87-1.57). Conclusions In this study, intakes of EPA and DHA and the consumption of fish were not associated with the onset of atrial fibrillation. This finding does not support that n-3 fatty acids have a general antiarrhythmic effect.