title: Effects of coronary stents on cardiovascular outcomes in broad-based clinical practice.
abstract: BACKGROUND
  Although stents have been shown to reduce the need for repeated percutaneous coronary intervention (PCI) in randomized trials, the effects of stents in broad-based, diverse clinical practice have not been well studied, nor has their effect on subsequent myocardial infarction or cardiac death.
  
  
  METHODS
  A retrospective cohort study was performed that included all 43 hospitals performing PCI in Pennsylvania in the last quarter of 1995, with the use of the Pennsylvania Health Care Cost Containment Council database. All 5258 patients who underwent PCI, excluding those with previous PCI within the preceding 6 months, were included. The primary outcomes were in-hospital events (death or coronary bypass), 6-month revascularization rates, and 6-month rates of cardiac death or myocardial infarction.
  
  
  RESULTS
  A total of 1240 patients (24%) had a stent procedure. Compared with nonstent procedures, stents reduced the risk of in-hospital events (multivariable odds ratio adjusted for patient and hospital level differences, 0.63; 95% confidence interval, 0.41-0.97), primarily because of a 52% reduction in the need for coronary bypass. Stents also reduced the need for follow-up revascularization procedures (multivariable hazard ratio, 0.72; 95% confidence interval, 0.59-0. 87), primarily because of a 31% reduction in repeated PCI. However, stents had no effect on 6-month rate of myocardial infarction or cardiac death (multivariable hazard ratio, 0.97; 95% confidence interval, 0.71-1.33).
  
  
  CONCLUSIONS
  Using stents decreases the need for repeated PCI in broad-based clinical practice, confirming results from randomized trials. However, this study did not detect any effect on subsequent myocardial infarction or cardiac death.
authors.affiliation: University of Pennsylvania School of Medicine, Center for Clinical Epidemiology and Biostatistics, 717 Blockley Hall, 423 Guardian Dr, Philadelphia, PA 19104-6021,USA. skimmel@cceb.med.upenn.edu
authors.forename: S E
authors.initials: SE
authors.lastname: Kimmel
authors.forename: A R
authors.initials: AR
authors.lastname: Localio
authors.forename: C
authors.initials: C
authors.lastname: Brensinger
authors.forename: C
authors.initials: C
authors.lastname: Miles
authors.forename: J
authors.initials: J
authors.lastname: Hirshfeld
authors.forename: H L
authors.initials: HL
authors.lastname: Haber
authors.forename: B L
authors.initials: BL
authors.lastname: Strom
mesh_terms: D000328:Adult; D000368:Aged; D003327:Coronary Disease / Q000401:mortality / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000517:prevention & control*; D016017:Odds Ratio; D010414:Pennsylvania; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012306:Risk; D015607:Stents; D016019:Survival Analysis; D013997:Time Factors; D016896:Treatment Outcome