Treating patients at high risk of cardiovascular events with the HMG-CoA (hydroxymethyl
glutaryl coenzyme A) reductase inhibitorsimvastatin reduced the risk
of myocardial infarction, stroke,and revascularisation by about one
third, even in patients withnormal or low blood cholesterol levels,
according to the latestfindings from the heart protection study
published thisweek.
The study randomised 20536 adults with coronary disease, other occlusive
artery disease, or diabetes to treatment with simvastatin(40 mg
daily) or placebo for fiveyears.
Results showed that deaths from all causes were reduced from 14.7% in
patients allocated to placebo to 12.9% (P=0.0003) inthose treated
with simvastatin, mainly owing to an 18% relativereduction in the
coronary death rate with statin treatment (6.9%v 5.7%;
P=0.0005). The risk of a first non-fatal myocardial infarction, coronary death,
non-fatal or fatal stroke, coronary or non-coronaryrevascularisation
was reduced by 24% (25.2% v 19.8%; P<0.0001).
Allowing for non-compliance, the researchers estimated that risk was reduced
by about a third in patients who took simvastatinas prescribed. The
benefits were similar in patients with lipidlevels that have
previously been regarded as normal and not requiringstatin
treatment, with starting low density lipoprotein cholesterolbelow
3.0 mmol/l or total cholesterol below 5.0 mmol/l. (Lancet
2002;360:7-22).
Jane Armitage, senior research fellow and honorary consultant in public
health medicine at the University of Oxford and clinicalcoordinator
of the heart protection study, said: "The study showsunequivocally
that statins can produce substantial benefit ina very much wider
range of high risk people than had beenthought."
She added: "What really matters is vascular risk. We should be treating risk,
not cholesterol. If a patient is at high enoughvascular risk that it
is worth reducing by about one third, thenit is worth considering
statin treatment regardless of theircholesterol."
Results from the study estimated that five years of simvastatin treatment
would prevent about 70-100 people per 1000 fromexperiencing at least
one major vascular eventand
longer treatmentwould produce further benefit. Long term statin
treatment waswell tolerated in the study, with no significant
adverse effectson cancer incidence, admission to hospital for other
non-vascularcauses, or effect on liverenzymes.
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