title: Pretransplant lung function, respiratory failure, and mortality after stem cell transplantation.
abstract: BACKGROUND
  The role of pulmonary function before stem cell transplant as a potential risk factor for the development of early post-transplant respiratory failure and mortality is controversial.
  
  
  METHODS
  We conducted a retrospective analysis of the pretransplant pulmonary function of 2,852 patients who received their transplant between 1990 and 2001.
  
  
  METHODS
  Pretransplant FEV(1), FVC, total lung capacity (TLC), diffusing capacity of carbon monoxide (DL(CO)), and the alveolar-arterial oxygen tension difference P(A-a)O(2) were measured and assessed for association with development of early respiratory failure and mortality in Cox proportional hazard logistic models.
  
  
  RESULTS
  In multivariate analyses, progressive decrease of all lung function parameters was associated with a stepwise increase in risk of developing early respiratory failure and mortality when assessed in independent models. On the basis of a significant correlation between FEV(1) and FVC (r = 0.81), FEV(1) and TLC (r = 0.61), and FVC and TLC (r = 0.80), and a lack of correlation between FEV(1) and DL(CO), we developed a pretransplant lung function score based on pretransplant FEV(1) and DL(CO) to determine the extent of pulmonary compromise before transplant. Multivariate analysis indicated that higher pretransplant lung function scores are associated with a significant increased risk for developing early respiratory failure (category II hazard ratio [HR], 1.4; category III HR, 2.2; category IV HR, 3.1; p < 0.001) and death (category II HR, 1.2; category III HR, 2.2; category IV HR, 2.7; p < 0.005).
  
  
  CONCLUSIONS
  These results suggest that not only does compromised pretransplant lung function contribute to the risk for development of early respiratory failure and mortality but this risk may be estimated before transplant by grading the extent of FEV(1) and DL(CO) compromise.
authors.affiliation: Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109-1024, USA.
authors.forename: Tanyalak
authors.initials: T
authors.lastname: Parimon
authors.forename: David K
authors.initials: DK
authors.lastname: Madtes
authors.forename: David H
authors.initials: DH
authors.lastname: Au
authors.forename: Joan G
authors.initials: JG
authors.lastname: Clark
authors.forename: Jason W
authors.initials: JW
authors.lastname: Chien
mesh_terms: D000328:Adult; D000368:Aged; D001784:Blood Gas Analysis; D005260:Female; D006402:Hematologic Diseases / Q000401:mortality / Q000628:therapy; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D016016:Proportional Hazards Models; D012131:Respiratory Insufficiency / Q000209:etiology* / Q000401:mortality* / Q000503:physiopathology; D012189:Retrospective Studies; D033581:Stem Cell Transplantation / Q000009:adverse effects* / Q000401:mortality*; D014184:Transplantation, Homologous; D014861:Washington / Q000453:epidemiology