title: How can we identify low- and high-risk patients among unselected patients with possible acute coronary syndrome?
abstract: OBJECTIVE
  Prognosis among patients admitted with possible acute coronary syndrome (ACS) may differ from that of patients with definite ACS. The aim of this study was to identify risk factors for mortality among unselected patients and to use the statistical model to identify patients at low or high mortality risk.
  
  
  METHODS
  From April 1, 2000, to March 31, 2002, we identified all consecutive patients aged 30 to 69 years admitted to the 2 coronary care units covering the municipality of Aarhus, Denmark (population, 138,290). ACS was considered a possible diagnosis if the physician at admission (1) had noted the presence or absence of chest pain, (2) performed a 12-lead electrocardiogram, and (3) measured markers of myocardial necrosis. In 1576 consecutive patients these criteria were fulfilled.
  
  
  RESULTS
  By logistic regression, predictors of mortality were age 60 and older, ST elevation, right bundle-branch block, arrhythmia, elevated markers of myocardial necrosis, and the diagnosis of ACS. The predictive validity of the model, as indicated by receiver operating characteristic curve area, was 85.7%, 87.8%, and 80.1% for 7-, 30-, and 365-day mortality, respectively.
  
  
  CONCLUSIONS
  Mortality may be predicted with high precision based on a statistical model. Identification of survivors by the use of a statistical model was superior as compared to simply ruling out the clinical diagnosis of ACS.
authors.affiliation: Department of Internal Medicine and Cardiology, Aarhus Sygehus University Hospital, Tage Hansens Gade 2, 8000 Aarhus C, Denmark. rlg04kmn@as.aaa.dk
authors.forename: Kirsten Melgaard
authors.initials: KM
authors.lastname: Nielsen
authors.forename: Ole
authors.initials: O
authors.lastname: Faergeman
authors.forename: Mogens Lytken
authors.initials: ML
authors.lastname: Larsen
authors.forename: Anders
authors.initials: A
authors.lastname: Foldspang
mesh_terms: D000328:Adult; D000368:Aged; D000789:Angina, Unstable / Q000175:diagnosis; D015331:Cohort Studies; D003325:Coronary Care Units; D003327:Coronary Disease / Q000175:diagnosis* / Q000401:mortality / Q000503:physiopathology; D003718:Denmark; D004562:Electrocardiography; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012307:Risk Factors