Document Detail

Frequency and severity of air trapping at dynamic expiratory CT in patients with tracheobronchomalacia.
MedLine Citation:
PMID:  14684517     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to compare the frequency and severity of air trapping in patients with and without tracheobronchomalacia using dynamic expiratory volumetric CT. MATERIALS AND METHODS: The study group consisted of 20 subjects, including 10 patients with bronchoscopically proven tracheobronchomalacia and 10 control subjects of similar ages without tracheobronchomalacia. All 20 subjects underwent MDCT performed at the end of deep inspiration and during dynamic expiration. The images were analyzed at three lung levels, and the extent of air trapping was assessed visually using a 5-point scale. For each subject, a total air-trapping score was derived by summing the values for the three lung levels (possible range, 0-12). Statistical analysis was performed using the Mann-Whitney U test. RESULTS: In the tracheobronchomalacia group, 10 (100%) of 10 patients showed air trapping, with a median score of 5 (range, 2-12). In the control group, six (60%) of 10 subjects showed air trapping, with a median score of 2 (range, 0-3). The median total air-trapping score was significantly higher (p < 0.001) for the tracheobronchomalacia group compared with the control group. Excessive central airway collapse (expiratory reduction in cross-sectional area of > 50%) was seen on CT scans in all tracheobronchomalacia patients but in none of the control subjects. CONCLUSION: Air trapping was observed with a higher frequency and greater severity in patients with tracheobronchomalacia than in a control group of patients of similar ages without tracheobronchomalacia.
J Zhang; I Hasegawa; H Hatabu; D Feller-Kopman; P M Boiselle
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  AJR. American journal of roentgenology     Volume:  182     ISSN:  0361-803X     ISO Abbreviation:  AJR Am J Roentgenol     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-19     Completed Date:  2004-02-12     Revised Date:  2008-02-15    
Medline Journal Info:
Nlm Unique ID:  7708173     Medline TA:  AJR Am J Roentgenol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  81-5     Citation Subset:  AIM; IM    
Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Ave., Boston, MA 02215, USA.
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MeSH Terms
Airway Obstruction / etiology*,  radiography*
Bronchial Diseases / complications,  radiography*
Middle Aged
Residual Volume*
Retrospective Studies
Severity of Illness Index
Tomography, X-Ray Computed*
Tracheal Diseases / complications,  radiography*

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