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Hu, Yang; Hu, Frank B; Manson, JoAnn E
Journal of the American Heart Association, 10/2019, Volume: 8, Issue: 19Journal Article
Background Whether marine omega-3 supplementation is associated with reduction in risk of cardiovascular disease (CVD) remains controversial. Methods and Results This meta-analysis included study-level data from 13 trials. The outcomes of interest included myocardial infarction, coronary heart disease (CHD) death, total CHD, total stroke, CVD death, total CVD, and major vascular events. The unadjusted rate ratios were calculated using a fixed-effect meta-analysis. A meta-regression was conducted to estimate the dose-response relationship between marine omega-3 dosage and risk of each prespecified outcome. During a mean treatment duration of 5.0 years, 3838 myocardial infarctions, 3008 CHD deaths, 8435 total CHD events, 2683 strokes, 5017 CVD deaths, 15 759 total CVD events, and 16 478 major vascular events were documented. In the analysis excluding REDUCE-IT (Reduction of Cardiovascular Events with Icosapent Ethyl-Intervention Trial), marine omega-3 supplementation was associated with significantly lower risk of myocardial infarction (rate ratio RR 95% CI: 0.92 0.86, 0.99; =0.020), CHD death (RR 95% CI: 0.92 0.86, 0.98; =0.014), total CHD (RR 95% CI: 0.95 0.91, 0.99; =0.008), CVD death (RR 95% CI: 0.93 0.88, 0.99; =0.013), and total CVD (RR 95% CI: 0.97 0.94, 0.99; =0.015). Inverse associations for all outcomes were strengthened after including REDUCE-IT while introducing statistically significant heterogeneity. Statistically significant linear dose-response relationships were found for total CVD and major vascular events in the analyses with and without including REDUCE-IT. Conclusions Marine omega-3 supplementation lowers risk for myocardial infarction, CHD death, total CHD, CVD death, and total CVD, even after exclusion of REDUCE-IT. Risk reductions appeared to be linearly related to marine omega-3 dose.
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