1. A method of reducing risk of one or more of: myocardial infarction, stroke, cardiovascular death, unstable angina, coronary revascularization procedures and/or hospitalizations for unstable angina in a subject on statin therapy and with an established cardiovascular disease, the method comprising administering to the subject a composition comprising eicosapentaenoic acid per day, wherein during the course of treatment the subject is monitored for symptoms of atrial fibrillation and/or flutter.