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Michael Pignone a Division of General Internal Medicine, 5039 Old
Clinic Building, University of North Carolina, Chapel Hill, NC
27599-7110, USA, b Preventive Medicine Residency Program, University
of North Carolina, Chapel Hill, c Division of General
Internal Medicine, Audie L Murphy VA Hospital, San Antonio, TX 78284, USA
Correspondence to: M Pignone pignone{at}med.unc.edu
Objective:
To summarise the effect of primary
prevention with lipid lowering drugs on coronary heart disease events,
coronary heart disease mortality, and all cause mortality.
Design:
Meta-analysis.
Identification:
Systematic search of the Medline
database from January 1994 to June 1999 for English language studies
examining drug treatment for lipid disorders (use of the MeSH terms
"hyperlipidemia" and "anticholesteremic agents," keyword
searches for individual drug names, and a search strategy for
identifying randomised trials to capture relevant articles);
identification of older studies through systematic reviews and hand
search of bibliographies.
Inclusion criteria:
All randomised trials of at least
one year's duration that examined drug treatment for patients with no
known coronary heart disease, cerebrovascular disease, or peripheral vascular disease and that measured clinical end points, including all
cause mortality, coronary heart disease mortality, and non-fatal myocardial infarctions.
Data extraction:
Review of the articles and extracted
relevant data by two authors separately, with disagreements resolved by consensus.
Results:
Four studies met eligibility criteria. Drug treatment reduced the odds of a coronary heart disease event by 30%
(summary odds ratio 0.70, 95% confidence interval 0.62 to 0.79) but
not the odds of all cause mortality (0.94, 0.81 to 1.09). When statin
drugs were considered alone, no substantial differences in results were found.
Conclusions:
Treatment with lipid lowering drugs
lasting five to seven years reduces coronary heart disease events but not all cause mortality in people with no known cardiovascular disease.
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