| Tracheal collapsibility measured using end-expiratory chest CT in chronic airway disease |
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Sang Ryul Lee, Eun Ju Song, Dae Hyun Baek, Sung Hyuk Lee, Jae Hyung Lee, Ki Doek Lee, Byoung Hoon Lee, Sang Hoon Kim |
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| 만성기도질환에서 호기말 흉부 CT를 이용한 기관협착에 관한 연구 |
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이상렬 &#; 송은주 &#; 백대현 &#; 이성혁 &#; 이재형 &#; 이기덕 &#; 이병, Eun Ju Song, Dae Hyun Baek, Sung Hyuk Lee, Jae Hyung Lee, Ki Doek Lee, Byoung Hoon Lee, Sang Hoon Kim |
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| Abstract |
Background/Aims
Partial tracheal narrowing can occur during expiration in the normal population. It is not certain
whether the trachea collapses more readily in chronic airway disease. We evaluated the tracheal narrowing at
end-expiration using computed tomography (CT).
Methods
We investigated 45 patients and 22 normal subjects who underwent high-resolution CT and pulmonary
function tests. In each subject, two CT images at the same level of the aortic arch were compared: one at end-inspiration
and the other at end-expiration. The cross-sectional area and sagittal diameter of the trachea were measured using a
hand-tracing method, using the in-program measuring tools of Medical Image Viewer, and the percentage changes of each
value were calculated.
Results
Of the 45 patients with chronic airway disease, 21 had chronic obstructive pulmonary disease, 16 had bronchial
asthma, and 8 had bronchiectasis. The mean change in the cross-sectional area was 13.3% in the patients and 9.0% in the
normal subjects (p<0.05), and the mean change in sagittal diameter was 11.8 and 9.6%, respectively (p>0.05). The
decrease in tracheal cross-sectional area was greatest in bronchiectasis, while the greatest decrease in sagittal diameter was
in bronchial asthma. There was no significant difference in tracheal collapsibility among the disease groups. The percent
change in the tracheal cross-sectional area was correlated with the % predicted FVC (r = -0.033, p<0.05) and FEV1 (r =
0.277, p<0.05) in both the patients and normal controls.
Conclusions
The decrease in tracheal cross-sectional area at end-expiration measured using chest CT was greater in chronic
airway disease than in normal subjects, and was associated with ventilatory function. (Korean J Med 76:172-178, 2009) |
| Key Words:
Trachea; Computed tomography; Pulmonary function tests; Chronic airflow obstruction |
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