title: Comparing outcomes of percutaneous transluminal coronary angioplasty with coronary artery bypass grafting; can routine health service data complement and enhance randomized controlled trials?
abstract: OBJECTIVE
  To compare outcomes of percutaneous transluminal coronary angioplasty (PTCA) with coronary artery bypass graft surgery (CABG) for a population stemming from routinely collected data, in order to assess the merits of such data sources as a complement, and possible enhancement, to randomized controlled trial results.
  
  
  RESULTS
  A population of Scottish patients were taken from a routine discharge summary and from this data source patients comparable to those from randomized controlled trial settings were identified. Between 1989 and 1995, 12 238 pseudo randomized controlled trial patients were identified from the routine data set, of which 3714 (30.3%) received PTCA and 8524 (69.7%) received CABG. The baseline characteristics of the pseudo randomized controlled trial and randomized controlled trial patients were similar. The evidence from both the randomized controlled trials and routine data indicate that for 1 year follow-up the risk of cardiac death and/or non-fatal myocardial infarction is not significantly different between the two treatment groups.
  
  
  CONCLUSIONS
  The outcomes expected of PTCA and CABG following trial evidence have been realized in the routine data which are representative of a complete, non-selective population. Due to the size of the routine data set it would be possible to set up hypotheses for potential subgroup effects at the outset.
authors.affiliation: Public Health Research Unit, University of Glasgow, Glasgow, Scotalnd, UK.
authors.forename: J D
authors.initials: JD
authors.lastname: Lewsey
authors.forename: G D
authors.initials: GD
authors.lastname: Murray
authors.forename: A H
authors.initials: AH
authors.lastname: Leyland
authors.forename: F A
authors.initials: FA
authors.lastname: Boddy
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000401:mortality / Q000706:statistics & numerical data; D001026:Coronary Artery Bypass / Q000401:mortality / Q000706:statistics & numerical data; D003327:Coronary Disease / Q000401:mortality / Q000628:therapy*; D016757:Death, Sudden, Cardiac / Q000453:epidemiology; D018572:Disease-Free Survival; D005260:Female; D006302:Health Services Research / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D016032:Randomized Controlled Trials as Topic / Q000592:standards* / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012606:Scotland / Q000453:epidemiology; D015983:Selection Bias; D015996:Survival Rate; D016896:Treatment Outcome