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Thoracic Imaging |
1 From the Department of Radiology and the Medical Research Group (EA2682), University Center Hospital Calmette, Blvd Jules Leclerc, Lille 59037, France (I.M., M.R.J., J.R.); and the Environmental and Occupational Health and Ergonomics Research Center, University of Lille (A.S., C.B., J.L.E.), France. Received June 30, 2000; revision requested August 8; revision received August 31; accepted September 19. Address correspondence to M.R.J. (e-mail: mremy-jardin@chru-lille.fr).
PURPOSE: To evaluate the frequency and morphologic characteristics of air trapping in volunteers with various smoking habits.
MATERIALS AND METHODS: Two hundred fifty volunteers (133 women, 117 men; mean age, 39 years), including 144 smokers, 47 ex-smokers, and 59 nonsmokers, prospectively underwent inspiratory and expiratory high-spatial-resolution computed tomography (CT) and pulmonary function tests (PFTs). The frequency and characteristics of air trapping were evaluated according to the population’s smoking habits and PFT results.
RESULTS: The overall frequency of air trapping was 62% (155 of 250 subjects). Lobular air trapping was depicted in 117 (47%) of 250 subjects, without significant differences among smokers (n = 91), ex-smokers (n = 33), and nonsmokers (n = 31) (P = .118). Segmental and lobar air trapping (38 [15%] of 250) were more frequent among smokers (24 [26%] of 91) and ex-smokers (nine [27%] of 33) (P < .001). No relationship was found between air trapping and functional indexes of small-airway disease when the CT pattern of air trapping was considered. The strongest relationship between CT abnormalities and functional alterations at the small-airways level was between inspiratory CT features of bronchiolitis: ground-glass opacity, ill-defined micronodules, bronchiolectasis, and air flow at low lung volumes.
CONCLUSION: Whereas a significant relationship was observed between segmental and lobar air trapping and cigarette consumption, lobular air trapping was not found to reflect functional impairment at the small-airways level.
Index terms: Bronchiolitis, 60.2191, 60.269 • Computed tomography (CT), high-resolution, 60.12111, 60.12118 • Lung, abnormalities, 60.2191, 60.269 • Lung, function • Lung, air trapping, 60.29 • Small airways disease, 60.2191, 60.269
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