title: EuroSCORE and the patients undergoing coronary bypass surgery at Santa Casa de São Paulo.
abstract: OBJECTIVE
  The aim of this study was to assess the performance of the European Risk System in Cardiac Operations (EuroSCORE) model to predict mortality in patients undergoing myocardial revascularization at the Division of Cardiovascular Surgery of Santa Casa de São Paulo Medical School.
  
  
  METHODS
  From May 2005 to November 2006, 100 consecutive patients undergoing coronary artery bypass surgery were retrospectively analyzed. The records of these patients were reviewed in order to retrieve those variables included in the EuroSCORE risk scoring method. The correlation of predicted and observed mortality was compared. Statistical analysis was performed using chi-square test for univariate analysis and Hosmer-Lemeshow Test for logistic regression model.
  
  
  RESULTS
  Hospital mortality was 5%. For EuroSCORE univariate analysis, findings were as follows: score 0-2 predicted mortality 0.40%, observed 0.00%; score 3-5 predicted mortality 1.45%, observed 0.00%; score greater than 6 predicted mortality 3.15%, observed 7.94%. Although these differences, p-value was 0.213 with no statistical significance. The p-value for the Hosmer-Lemeshow Test was < 0.001 indicating poor calibration of the model for this sample.
  
  
  CONCLUSIONS
  The EuroSCORE model is a simple, objective system to estimate hospital mortality. However, to validate the logistic regression analysis, it is necessary hundreds of patients, which limit its widespread application.
authors.affiliation: Hospital Central da Irmandade de Misericórdiada Santa Casa de São Paulo, Departamento de Cirurgia, Disciplina de Cirurgia Cardiovascular da Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brasil. valpelisser@terra.com.br
authors.forename: Valquíria Pelisser
authors.initials: VP
authors.lastname: Campagnucci
authors.forename: Ana Maria Rocha
authors.initials: AM
authors.lastname: Pinto E Silva
authors.forename: Wilson Lopes
authors.initials: WL
authors.lastname: Pereira
authors.forename: Eduardo Gregório
authors.initials: EG
authors.lastname: Chamlian
authors.forename: Sylvio Matheus de Aquino
authors.initials: SM
authors.lastname: Gandra
authors.forename: Luis Antonio
authors.initials: LA
authors.lastname: Rivetti
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil; D016009:Chi-Square Distribution; D001026:Coronary Artery Bypass / Q000401:mortality*; D003327:Coronary Disease / Q000175:diagnosis / Q000601:surgery*; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors