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In the last 2 years in the cardiovascular field eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been investigated in terms of their epidemiology and vascular biology, and in large-scale intervention trials, and incorporated into the guidelines of cardiac societies. EPA and DHA have advanced from scientific research into everyday practice, a development reviewed here.EPA and DHA are antiarrhythmic on the supraventricular and ventricular levels, besides having an antiatherosclerotic effect. Fish rich in EPA and DHA, contaminated with methyl-mercury, appears less protective. Large-scale clinical trials demonstrated that morbidity can be reduced with EPA even in a population already consuming large amounts of EPA and DHA. Therapy with EPA and DHA can be monitored with the omega-3 index, a risk factor for sudden cardiac death. EPA and DHA appear to be cost-saving in the USA, and, as Omacor, are cost-effective in several European countries.European and American Cardiac Societies incorporated EPA and DHA into recent treatment guidelines for myocardial infarction, prevention of cardiovascular disease, treatment of ventricular arrhythmias and prevention of sudden cardiac death. Physicians need to reduce the burden of cardiovascular disease by advocating EPA and DHA to all patients likely to benefit.