title: Bronchiolitis obliterans following lung transplantation: early detection using computed tomographic scanning.
abstract: BACKGROUND
  Computed tomographic (CT) scanning may enable earlier diagnosis of chronic lung allograft dysfunction than forced expiratory volume in 1 second (FEV1). A study was undertaken to determine intra-observer and inter-observer agreement of composite and air trapping CT scores, to examine the association of FEV1 with the composite and air trapping CT score, and to relate the baseline composite CT score to changes in FEV1 and changes in the composite CT score over 1 year.
  
  
  METHODS
  Lung function and baseline CT scans following transplantation and at subsequent annual follow ups were analysed in 38 lung transplant recipients. Scans were randomly scored by two observers for bronchiectasis, mucus plugging, airway wall thickening, consolidation, mosaic pattern, and air trapping, and re-scored after 1 month. CT scores were expressed on a scale of 0-100 and correlated with FEV1 as a percentage of the post-transplant baseline value.
  
  
  RESULTS
  The mean (SD) interval between baseline and follow up CT scans was 11.2 (4.7) months. Inter-observer and intra-observer agreement was good for both the composite and air trapping CT scores. There was a significant association between FEV1 and the composite CT score, with each unit of worsening in the baseline composite CT score predicting a 1.55% and 1.37% worsening in FEV1 over the following year (p<0.0001) and a 1.25 and 1.12 unit worsening in the composite CT score (p<0.0001) for observers 1 and 2, respectively.
  
  
  CONCLUSIONS
  These findings indicate a potential role for a composite CT scoring system in the early detection of bronchiolitis obliterans.
authors: Department of Medicine, University of British Columbia, Vancouver, BC, Canada.
authors: P A
authors: PA
authors: de Jong
authors: J D
authors: JD
authors: Dodd
authors: H O
authors: HO
authors: Coxson
authors: C
authors: C
authors: Storness-Bliss
authors: P D
authors: PD
authors: Paré
authors: J R
authors: JR
authors: Mayo
authors: R D
authors: RD
authors: Levy