title: An obesity paradox of Asian body mass index after cardiac surgery: arterial oxygenations in duration of mechanic ventilation.
abstract: BACKGROUND
  Numerous studies have documented an obesity paradox that overweight of Caucasian patients has better prognosis after cardiac surgery. This study is to examine Asian patients' BMI to see whether an obesity paradox exists in DMV after cardiac surgery.
  
  
  METHODS
  A retrospective study consisted of 428 patients after cardiac surgery from January 2006 to December 2010 in the medical center of Taiwan. The Asian BMI was divided into 3 groups: under-normal weight patients (BMI < 24; n = 165), overweight patients (BMI 24 to <27; n = 130), and obese patients (BMI ≥ 27; n = 133). Multivariable analysis and paired t were used to compare all variables.
  
  
  RESULTS
  Overweight patients were significantly associated with the shortest DMV. Under-normal weight patients had significantly better oxygenations of AaDO₂ and P/F ratio in the DMV; however, they correlated with the longest DMV, older age, more female, lower LVSV, higher BUN, more dialysis-dependent, and poorer outcomes, namely, 1-year mortality, HAP, reintubation, tracheotomy, and LOS.
  
  
  CONCLUSIONS
  Asian overweight patients after cardiac surgery have better prognosis. Under-normal weight patients have higher risk factors, longer DMV, and poorer outcomes; even though they have better arterial oxygenations, they seem to need better arterial oxygenations for successful weaning ventilator.
authors.affiliation: Department of Respiratory Therapy, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.
authors.forename: Chiu-Hsia
authors.initials: CH
authors.lastname: Chang
authors.forename: Fan-Yen
authors.initials: FY
authors.lastname: Lee
authors.forename: Chin-Chou
authors.initials: CC
authors.lastname: Wang
authors.forename: Ying-Ni
authors.initials: YN
authors.lastname: Chen
authors.forename: Hsin-Chu
authors.initials: HC
authors.lastname: Chen
authors.forename: Huei-Ling
authors.initials: HL
authors.lastname: Hung
authors.forename: Meng-Chih
authors.initials: MC
authors.lastname: Lin
authors.forename: Shih-Feng
authors.initials: SF
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D015992:Body Mass Index; D003324:Coronary Artery Disease / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009765:Obesity / Q000503:physiopathology; D050177:Overweight / Q000503:physiopathology; D012121:Respiration, Artificial / Q000379:methods*; D012189:Retrospective Studies; D012307:Risk Factors; D013903:Thoracic Surgery; D016896:Treatment Outcome