Tr. Pedersen et al., RANDOMIZED TRIAL OF CHOLESTEROL-LOWERING IN 4444 PATIENTS WITH CORONARY-HEART-DISEASE - THE SCANDINAVIAN SIMVASTATIN SURVIVAL STUDY (4S), Lancet, 344(8934), 1994, pp. 1383-1389
Drug therapy for hypercholesterolaemia has remained controversial main
ly because of insufficient clinical trial evidence for improved surviv
al. The present trial was designed to evaluate the effect of cholester
ol lowering with simvastatin on mortality and morbidity in patients wi
th coronary heart disease (CHD). 4444 patients with angina pectoris or
previous myocardial infarction and serum cholesterol 5.5-8.0 mmol/L o
n a lipid-lowering diet were randomised to double-blind treatment with
simvastatin or placebo. Over the 54 years median follow-up period, si
mvastatin produced mean changes in total cholesterol, low-density-lipo
protein cholesterol, and high-density-lipoprotein cholesterol of -25%,
-35%, and +80%, respectively, with few adverse effects. 256 patients
(12%) in the placebo group died, compared with 182 (8%) in the simvast
atin group. The relative risk of death in the simvastatin group was 0.
70 (95% CI 0.58-0.85, p=0.0003). The 6-year probabilities of survival
in the placebo and simvastatin groups were 87.6% and 91.3%, respective
ly. There were 189 coronary deaths in the placebo group and 111 in the
simvastatin group (relative risk 0.58, 95% CI 0.46-0.73), while nonca
rdiovascular causes accounted for 49 and 46 deaths, respectively. 622
patients (28%) in the placebo group and 431 (19%) in the simvastatin g
roup had one or more major coronary events. The relative risk was 0.66
(95% CI 0.59-0.75, p<0.00001), and the respective probabilities of es
caping such events were 70.5% and 79.6%. This risk was also significan
tly reduced in subgroups consisting of women and patients of both sexe
s aged 60 or more. Other benefits of treatment included a 37% reductio
n (p<0.00001) in the risk of undergoing myocardial revascularisation p
rocedures. This study shows that long-term treatment with simvastatin
is safe and improves survival in CHD patients,