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(Circulation. 2003;108:1191.)
© 2003 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Divisions of Preventive Medicine (T.K., R.J.G., J.E.B., J.M.G.), Aging (T.K., J.M.G.), and Cardiovascular Disease (J.M.G.), Department of Medicine, Brigham and Womens Hospital, and Department of Ambulatory Care and Prevention (J.E.B.), Harvard Medical School; the Departments of Epidemiology (T.K., A.M.W., J.E.B., K.A.C.) and Biostatistics (R.J.G.), Harvard School of Public Health; the Massachusetts Veterans Epidemiology Research and Information Center (J.M.G.), Boston VA Healthcare System, Boston, Mass; the Epidemiology Division (A.M.W.), Ingenix Pharmaceutical Services, Auburndale, Mass; the Departments of Medicine and Epidemiology and Public Health (C.H.H.), University of Miami School of Medicine, Miami, Fla; and Mount Sinai Medical CenterMiami Heart Institute, Miami Beach, Fla.
Correspondence to Tobias Kurth, MD, ScD, Brigham and Womens Hospital, Division of Preventive Medicine, 900 Commonwealth Ave E, Boston, MA 02215-1204. E-mail tkurth{at}rics.bwh.harvard.edu
Received March 24, 2003; revision received May 15, 2003; accepted May 16, 2003.
Background There is clear evidence from numerous randomized trials and their meta-analyses that aspirin reduces risks of first myocardial infarction (MI). Recent data also suggest that other nonsteroidal anti-inflammatory drugs (NSAIDs) may interfere with this benefit of aspirin.
Methods and Results We performed subgroup analysis from a 5-year randomized, double-blind, placebo-controlled trial of 325 mg aspirin on alternate days among 22 071 apparently healthy US male physicians with prospective observational data on use of NSAIDs. A total of 378 MIs were confirmed, 139 in the aspirin group and 239 in the placebo group. Aspirin conferred a statistical extreme (P<0.00001) 44% reduction in risk of first MI. Among participants randomized to aspirin, use of NSAIDs on 1 to 59 d/y was not associated with MI (multivariable adjusted relative risk [RR], 1.21; 95% confidence interval [CI], 0.78 to 1.87), whereas the use of NSAIDs on
60 d/y was associated with MI (RR, 2.86; 95% CI, 1.25 to 6.56) compared with no use of NSAIDs. In the placebo group, the RRs for MI across the same categories of NSAID use were 1.14 (95% CI, 0.81 to 1.60) and 0.21 (95% CI, 0.03 to 1.48).
Conclusions These data suggest that regular but not intermittent use of NSAIDs inhibits the clinical benefits of aspirin. Chance, bias, and confounding remain plausible alternative explanations, despite the prospective design and adjustment for covariates. Nonetheless, we believe the most plausible interpretation of the data to be that regular but not intermittent use of NSAIDs inhibits the clinical benefit of aspirin on first MI.
Key Words: myocardial infarction aspirin prevention epidemiology
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