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Patients with increased triglyceride levels compared to those with normal levels are at higher risk for coronary heart disease. In patients with severe (≥500 mg/dl) hypertriglyceridemia (SHTG), clinical trials have demonstrated that prescription ω-3 fatty acids (P-OM3s) 4 g/day can decrease triglyceride levels by 45%. However, the precise health and economic benefits of decreasing SHTG with P-OM3 are unknown. We used the previously validated Archimedes model to simulate a 20-year trial involving subjects 45 to 75 years old with SHTG. The trial consisted of an intervention arm (P-OM3 4 g/day) and a control arm. Simulation results for the control arm indicated that subjects with SHTG are at about 2 times higher risk for myocardial infarction than those with normal triglyceride levels. Using estimates from previous epidemiologic studies and meta-analyses with OM3s, the model predicted 29% to 36% decreases in …