title: Risk factors for acute myocardial infarction during the postoperative period of myocardial revascularization.
abstract: OBJECTIVE
  To identify risk factors for acute myocardial infarction during the postoperative period after myocardial revascularization.
  
  
  METHODS
  This was a case-control study paired for sex, age, number, type of graft used, coronary endarterectomy, type of myocardial protection, and use of extracorporeal circulation. We assessed 178 patients (89 patients in each group) undergoing myocardial revascularization, and the following variables were considered: dyslipidemia, systemic hypertension, smoking, diabetes mellitus, previous myocardial revascularization surgery, previous coronary angioplasty, and acute myocardial infarction.
  
  
  RESULTS
  Baseline clinical characteristics did not differ in the groups, except for previous myocardial revascularization surgery, prevalent in the case group (34 patients vs. 12 patients; p = 0.0002). This was the only independent predictor of risk for acute myocardial infarction in the postoperative period, based on a multivariate logistic regression analysis (p = 0.0001). Mortality and the time of hospital stay of the case group were significantly higher (19.1% vs. 1.1%; p < 0.001 and 15.7 days vs. 10.6 days; p < 0.05 respectively) than those of the control.
  
  
  CONCLUSIONS
  Only previous myocardial revascularization was an independent predictor of acute myocardial infarction in the postoperative period, based on multivariate logistic regression analysis.
authors.affiliation: Hospital do Coração-Rua Desembargador Eliseu Guilherme, 123-04004-030-São Paulo, SP, Brazil. rmvcosta@uol.com.br
authors.forename: José Ribamar
authors.initials: JR
authors.lastname: Júnior Costa
authors.forename: Dinaldo C
authors.initials: DC
authors.lastname: Oliveira
authors.forename: Alexei
authors.initials: A
authors.lastname: DerBedrossian
authors.forename: Enilton T
authors.initials: ET
authors.lastname: Egito
authors.forename: Edson R
authors.initials: ER
authors.lastname: Romano
authors.forename: Marcos O
authors.initials: MO
authors.lastname: Barbosa
authors.forename: Ieda M
authors.initials: IM
authors.lastname: Liguori
authors.forename: Jorge
authors.initials: J
authors.lastname: Fahran
authors.forename: Luis C
authors.initials: LC
authors.lastname: Souza
authors.forename: Adib D
authors.initials: AD
authors.lastname: Jatene
authors.forename: Leopoldo S
authors.initials: LS
authors.lastname: Piegas
mesh_terms: D001938:Brazil / Q000453:epidemiology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D015994:Incidence; D007902:Length of Stay; D008297:Male; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000209:etiology* / Q000401:mortality; D009204:Myocardial Revascularization / Q000401:mortality; D016017:Odds Ratio; D011183:Postoperative Complications; D012189:Retrospective Studies; D012307:Risk Factors