on February 17, 2003
Circulation. 2003
Published online before print February 17, 2003, doi: 10.1161/01.CIR.0000051362.96946.15
Published online before print February 17, 2003, doi: 10.1161/01.CIR.0000051362.96946.15
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Submitted on July 29, 2002
From the Population Health Research Institute and Division of Cardiology (S.Y., S.R.M., F.Z.), McMaster University, Hamilton, Canada; Mayo Clinic (B.G.), Rochester, Minn; University of Cape Town (P.C.), Cape Town, South Africa; Bristol-Myers Squibb (M.B.), Princeton, NJ; Postgraduate Medical School (A.B.), Grochowski Hospital, Warsaw, Poland; University of Mainz (T.W.), Mainz, Germany; and University of Edinburgh (K.A.A.F.), Edinburgh, UK. * To whom correspondence should be addressed. E-mail: yusufs{at}mcmaster.ca.
Background--The risk of ischemic events is high, both early and late after acute coronary syndromes (ACS). We examine the benefits and risks associated with the use of adding clopidogrel to aspirin within the first 30 days and later (31 days to 12 months) in 12 562 patients with ACS. Methods and Results--A total of 12 562 ACS patients were randomized to receive clopidogrel (300 mg initially followed by 75 mg/d) or placebo for 3 to 12 months. The proportion of patients experiencing cardiovascular death, myocardial infarction, or strokes (primary outcome) at 30 days was 5.4% in the placebo group and 4.3% in the active group (relative risk 0.79, 95% CI 0.67 to 0.92). Beyond 30 days, the corresponding rates were 6.3% versus 5.2% (relative risk 0.82, 95% CI 0.70 to 0.95). There was no significant excess in life-threatening bleeds in each period (0.97% versus 1.28%, relative risk 1.32, 95% CI 0.95 to 1.84 for 0 to 30 days; 0.83% versus 0.91%, relative risk 1.09, 95% CI 0.75 to 1.59 for 31 days to 12 months). Further subdivision of the early data indicates benefits within 24 hours with consistently lower rates of the primary outcome in combination with refractory or severe ischemia. Conclusions--Clopidogrel reduces the risk of ischemic vascular events, with the benefits emerging within 24 hours of initiation of treatment and continuing throughout the 12 months (mean 9 months) of the study.
Revised on November 5, 2002
Accepted on November 7, 2002
Early and Late Effects of Clopidogrel in Patients With Acute Coronary Syndromes
Salim Yusuf MBBS*,
Key words: coronary disease • prevention • platelets
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