title: The effect of the body mass index on postoperative complications of coronary artery bypass grafting in elderly.
abstract: OBJECTIVE
  To evaluate the effect of BMI (body mass index) in the postoperative period of elderly patients undergoing CABG.
  
  
  METHODS
  Cross-sectional retrospective study, carried out in academic hospital, with all patients (n=290), aged or above 60 years, undergone CABG, from August 2006 to July 2007. The patients were divided into tertiles of BMI (<22, 22-27, >27 kg/m(2)). The variables included in the study were collected from medical records of patients and analyzed by logistic regression in association with the categories of BMI.
  
  
  RESULTS
  In the group with malnutrition were found larger percentage of impaired lung, kidney, hospital stay and immediate surgical mortality; but without statistical significance. Among female patients, the group malnutrition and eutrophy, 61.5% had hospital stay for a period longer than seven postoperative days compared to 42.5% male patients (P=0.003). In the group with malnutrition was found association between the CPB time and renal dysfunction with P<0.001 and, in eutrophic group with P=0.04. Obesity obtained protective association for lung dysfunction (RR=0.99), readmissions (RR=0.45) and mortality (RR = 0.77), and risk factor for renal dysfunction (RR=1.12).
  
  
  CONCLUSIONS
  In short-term, elderly with lower BMI may have increased the risk for complications. In contrast, obesity can have a protective effect, except for renal dysfunction.
authors.affiliation: Institute of Cardiology, University Cardiology Foundation, University of Rio Grande do Sul. nutri.cissa@yahoo.com.br
authors.forename: Cíntia
authors.initials: C
authors.lastname: Reis
authors.forename: Sandra Mari
authors.initials: SM
authors.lastname: Barbiero
authors.forename: Luciane
authors.initials: L
authors.lastname: Ribas
mesh_terms: D000368:Aged; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D001026:Coronary Artery Bypass / Q000009:adverse effects*; D004812:Epidemiologic Methods; D005112:Extracorporeal Circulation; D005260:Female; D006801:Humans; D007674:Kidney Diseases / Q000453:epidemiology* / Q000209:etiology; D007902:Length of Stay / Q000706:statistics & numerical data; D008171:Lung Diseases / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D044342:Malnutrition / Q000150:complications; D008875:Middle Aged; D009765:Obesity / Q000150:complications; D011184:Postoperative Period; D012307:Risk Factors; D013997:Time Factors