Drug-Eluting or Bare-Metal Stents for Acute Myocardial Infarction
Laura Mauri, M.D., M.Sc., Treacy S. Silbaugh, B.Sc., Pallav Garg, M.B., B.S., M.Sc., Robert E. Wolf, M.S., Katya Zelevinsky, B.A., Ann Lovett, R.N., M.A., Manu R. Varma, B.S., Zheng Zhou, M.D., Ph.D., and Sharon-Lise T. Normand, Ph.D.
Background Studies comparing percutaneous coronary intervention(PCI) with drug-eluting and bare-metal coronary stents in acutemyocardial infarction have been limited in size and duration.
Methods We identified all adults undergoing PCI with stentingfor acute myocardial infarction between April 1, 2003, and September30, 2004, at any acute care, nonfederal hospital in Massachusettswith the use of a state-mandated database of PCI procedures.We performed propensity-score matching on three groups of patients:all patients with acute myocardial infarction, all those withacute myocardial infarction with ST-segment elevation, and allthose with acute myocardial infarction without ST-segment elevation.Propensity-score analyses were based on clinical, procedural,hospital, and insurance information collected at the time ofthe index procedure. Differences in the risk of death betweenpatients receiving drug-eluting stents and those receiving bare-metalstents were determined from vital-statistics records.
Results A total of 7217 patients were treated for acute myocardialinfarction (4016 with drug-eluting stents and 3201 with bare-metalstents). According to analysis of matched pairs, the 2-year,risk-adjusted mortality rates were lower for drug-eluting stentsthan for bare-metal stents among all patients with myocardialinfarction (10.7% vs. 12.8%, P=0.02), among patients with myocardialinfarction with ST-segment elevation (8.5% vs. 11.6%, P=0.008),and among patients with myocardial infarction without ST-segmentelevation (12.8% vs. 15.6%, P=0.04). The 2-year, risk-adjustedrates of recurrent myocardial infarction were reduced in patientswith myocardial infarction without ST-segment elevation whowere treated with drug-eluting stents, and repeat revascularizationrates were significantly reduced with the use of drug-elutingstents as compared with bare-metal stents in all groups.
Conclusions In patients presenting with acute myocardial infarction,treatment with drug-eluting stents is associated with decreased2-year mortality rates and a reduction in the need for repeatrevascularization procedures as compared with treatment withbare-metal stents.
Source Information
From Brigham and Women's Hospital (L.M., P.G., M.R.V., Z.Z.), the Harvard Clinical Research Institute (L.M.), Harvard Medical School (L.M., T.S.S., R.E.W., K.Z., A.L., S.-L.T.N.), and the Harvard School of Public Health (S.-L.T.N.) — all in Boston.
Address reprint requests to Dr. Mauri at Brigham and Women's Hospital, 75 Francis St., Boston, MA 02115, or at lmauri1{at}partners.org.
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