title: Survival benefit of coronary-artery bypass grafting accounted for deaths in those who remained untreated.
abstract: BACKGROUND
  Currently there are no direct estimates of mortality reduction afforded by coronary-artery bypass grafting (CABG) that take into account the deaths among patients for whom coronary revascularization was indicated but who did not undergo the treatment. The objective of this analysis was to compare survival after the treatment decision between patients who underwent CABG and those who remained untreated.
  
  
  METHODS
  We used a population-based registry to identify patients with established coronary artery disease who were to undergo first-time isolated CABG. We measured the effect of surgical revascularization on survival after the treatment decision in two cohorts of patients categorized by symptoms, coronary anatomy, and left ventricular function.
  
  
  RESULTS
  One in 10 patients died during the five years after treatment decision. The hazard of death among patients who underwent CABG was 51 percent of that for the untreated group, the adjusted hazard ratio was 0.51 (95 percent confidence interval, 0.43 to 0.61). The effect was stronger when CABG was performed within the recommended time: adjusted hazard ratios were 0.43 (95 percent confidence interval, 0.35 to 0.53) and 0.58 (95 percent confidence interval, 0.48 to 0.70) for early and late intervention, respectively; chi-square for the difference between hazard ratios was 12.2 (P < 0.001).
  
  
  CONCLUSIONS
  Estimates that account for patients who died before they could undergo a required CABG indicate a significant survival benefit of performing early surgical revascularization even for patients registered to undergo the operation on the non-urgent basis.
authors.affiliation: Department of Health Care and Epidemiology, The University of British Columbia, Canada. sobolev@interchange.ubc.ca
authors.forename: Boris G
authors.initials: BG
authors.lastname: Sobolev
authors.forename: Guy
authors.initials: G
authors.lastname: Fradet
authors.forename: Robert
authors.initials: R
authors.lastname: Hayden
authors.forename: Lisa
authors.initials: L
authors.lastname: Kuramoto
authors.forename: Adrian R
authors.initials: AR
authors.lastname: Levy
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Fitzgerald
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001955:British Columbia / Q000453:epidemiology; D002423:Cause of Death / Q000639:trends; D001026:Coronary Artery Bypass / Q000401:mortality*; D003324:Coronary Artery Disease / Q000401:mortality / Q000601:surgery*; D003657:Decision Making; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate / Q000639:trends; D016896:Treatment Outcome