title: Tests of airway function in detecting and monitoring treatment of obliterative bronchiolitis after lung transplantation.
abstract: BACKGROUND
  This study evaluated different tests of airway function in detection of obliterative bronchiolitis. It included analysis of spirogram within the time domain in patients with and without obliterative bronchiolitis (OB) after heart lung and lung transplantation. The purpose of this analysis is to evaluate which tests are of greatest value for early recognition of OB.
  
  
  METHODS
  The coefficient of variation of different airway function tests was calculated in 13 patients who had no evidence of OB and 12 patients who developed OB post-transplantation. In the patients with OB the effect of treatment with total lymphoid irradiation (TLI) was investigated by comparing the rate of change of lung function before and after TLI. Several lung function tests were used.
  
  
  RESULTS
  The measurements that showed the least variation were FEV(1), FVC, PEF, FEV(1)/FVC ratio and the Moment Ratio, while those which became abnormal earlier were FEV(1), FEV(1)/FVC, MEF(50), and the first moment. Additionally, the tests that became abnormal in a higher proportion of patients were MMEF, MEF(50), MEF(75), and the first moment.
  
  
  CONCLUSIONS
  The results o thi support the use of simple spirometric indices for the detection of OB. In the patients with OB the rates of decline of lung function were significantly attenuated by treatment with TLI as determined by several different tests.
  
  
  BACKGROUND
  obliterative bronchiolitis, lung transplantation, moments analysis, airway function tests, total lymphoid irradiation
authors.affiliation: Department of Respiratory Medicine, Regional Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne, England, UK.
authors.forename: R A
authors.initials: RA
authors.lastname: Chacon
authors.forename: P A
authors.initials: PA
authors.lastname: Corris
authors.forename: J H
authors.initials: JH
authors.lastname: Dark
authors.forename: G J
authors.initials: GJ
authors.lastname: Gibson
mesh_terms: D000293:Adolescent; D000328:Adult; D001989:Bronchiolitis Obliterans / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D016040:Lung Transplantation / Q000009:adverse effects*; D015182:Lymphatic Irradiation; D008297:Male; D008448:Maximal Expiratory Flow Rate; D008450:Maximal Midexpiratory Flow Rate; D008875:Middle Aged; D012129:Respiratory Function Tests; D012189:Retrospective Studies; D013147:Spirometry; D014797:Vital Capacity