title: Body mass index--predictor of outcome after coronary artery bypass grafting.
abstract: OBJECTIVE
  Increased body mass index has been associated with increased postoperative morbidity. We studied the effect of body mass index in our population, using a modified scale suggested by the World Health Organization.
  
  
  METHODS
  From January 2006 to December 2008, 1019 patients undergoing first-time isolated elective coronary artery bypass grafting were selected from our cardiac surgery database. Data were analyzed by univariate and multivariate analyses.
  
  
  RESULTS
  Of the 1019 elective coronary artery bypass patients, 168 (15.8%) had a normal body mass index (18.5-22.9 kg·m(-2)) and 894 (84.2%) had a high body mass index (≥23.0 kg·m(-2)). There were 921 (86.7%) patients with 3-vessel disease, and 1012 (95.3%) had internal mammary artery grafts. The 30-day mortality was 0.8%. Multivariate analysis revealed age, hospital stay, perfusion time, and renal failure were significantly associated with hospital complications. High body mass index was not significantly associated with morbidity or mortality. The model had an adequate fit at p = 0.708 by the Hosmer and Lemeshow test.
  
  
  CONCLUSIONS
  Increased body mass index alone is not a predictor of increased mortality and morbidity. In fact, these outcomes were associated with advanced age, hospital stay, perfusion time, and renal failure.
authors.affiliation: Department of Surgery, The Aga Khan University, Karachi, Pakistan.
authors.forename: Syed
authors.initials: S
authors.lastname: Shahabuddin
authors.forename: Shazia
authors.initials: S
authors.lastname: Perveen
authors.forename: Shumaila
authors.initials: S
authors.lastname: Furnaz
authors.forename: Saulat
authors.initials: S
authors.lastname: Fatimi
authors.forename: Shahid
authors.initials: S
authors.lastname: Sami
authors.forename: Hasanat
authors.initials: H
authors.lastname: Sharif
mesh_terms: D000367:Age Factors; D000368:Aged; D015992:Body Mass Index; D001026:Coronary Artery Bypass / Q000009:adverse effects / Q000401:mortality; D003324:Coronary Artery Disease / Q000150:complications / Q000175:diagnosis / Q000401:mortality / Q000601:surgery*; D017558:Elective Surgical Procedures; D005260:Female; D006801:Humans; D007902:Length of Stay; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009765:Obesity / Q000150:complications* / Q000175:diagnosis / Q000401:mortality; D016017:Odds Ratio; D010477:Perfusion / Q000009:adverse effects; D051437:Renal Insufficiency / Q000150:complications; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors; D016896:Treatment Outcome
keywords: Body mass index; coronary artery bypass; morbidity; pakistan; risk factors