Helsinki Heart Study: Primary-Prevention Trial with Gemfibrozil in Middle-Aged Men with Dyslipidemia

Abstract

In a randomized, double-blind five-year trial, we tested the efficacy of simultaneously elevating serum levels of serum levels of HDL and lowering levels of non-HDL cholesterol with gemfibrozil in reducing the risk of coronary heart diseae in 4081 asymptomatic middle-aged men (40-55 years of age) with primary dyslipidemia (non-HDL cholesterol > 200mm/dL in two consecutive pretreatment measurements). One group (2051 men) received 600 mg of gemfibrozil twice daily, and the other (2030 men) received placebo. Gemfibrozil caused a marked increase in HDL cholesterol and persistent reductions in serum levels of total, LDL, and non-HDL cholesterol and triglycerides. There wer minimal changes in serum lipid levels in the placebo group. The cumulative rate of cardiac end points at five years was 27.3 per 1000 in the gemfibrozil group and 41.4 per 1000 in the placebo group--a reduction of 34 percent in the incidence of coronary heart disease (95% confidence interval, 8.2 to 52.6; p< 0.02; two-tailed test). The decline in incidence in the gemfibrozil group became evident in the second year and continued throughout the study. There was no difference between the groups in the total death rate, nor did the treatment influence the cancer rates. The results are in accord with two previous trials with different pharmacologic agents and indicate that modification of lipoprotein levels with gemfibrozil reduces the incidence of coronary heart disease in men with dyslipidemia.