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KMID : 0383820120720010008
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Tuberculosis and Respiratory Diseases
2012 Volume.72 No. 1 p.8 ~ p.14
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Contributors of the Severity of Airflow Limitation in COPD Patients
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Hong Yoon-Ki
Chae Eun-Jin
Seo Joon-Beom
Lee Ji-Hyun
Kim Eun-Kyung
Lee Young-Kyung
Kim Tae-Hyung
Kim Woo-Jin
Lee Jin-Hwa
Lee Sang-Min
Lee Sang-Yeub
Lim Seong-Yong
Shin Tae-Rim
Yoon Ho-Il
Sheen Seung-Soo
Ra Seung-Won
Lee Jae-Seung
Huh Jin-Won
Lee Sang-Do
Oh Yeon-Mok
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Abstract
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Background : Although airway obstruction in chronic obstructive pulmonary disease (COPD) is due to pathologic processes in both the airways and the lung parenchyma, the contribution of these processes, as well as other factors, have not yet been evaluated quantitatively. We therefore quantitatively evaluated the factors contributing to airflow limitation in patients with COPD.
Materials and Methods : The 213 COPD patients were aged ＞45 years, had smoked ＞10 pack-years of cigarettes, and had a post-bronchodilator forced expiratory volume in one second (FEV1)/forced vital capacity (FVC) ＜0.7. All patients were evaluated by medical interviews, physical examination, spirometry, bronchodilator reversibility tests, lung volume, and 6-minute walk tests. In addition, volumetric computed tomography (CT) was performed to evaluate airway wall thickness, emphysema severity, and mean lung density ratio at full expiration and inspiration. Multiple linear regression analysis was performed to identify the variables independently associated with FEV1 - the index of the severity of airflow limitation.
Results : Multiple linear regression analysis showed that CT measurements of mean lung density ratio (standardized coefficient β=?0.46; p＜0.001), emphysema severity (volume fraction of the lung less than ?950 HU at full inspiration; β=?0.24; p＜0.001), and airway wall thickness (mean wall area %; β=?0.19, p=0.001), as well as current smoking status (β=?0.14; p=0.009) were independent contributors to FEV1.
Conclusion : Mean lung density ratio, emphysema severity, and airway wall thickness evaluated by volumetric CT and smoking status could independently contribute to the severity of airflow limitation in patients with COPD.
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KEYWORD
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Pulmonary Disease, Chronic Obstructive, Forced Expiratory Volumes, Tomography, X-Ray Computed
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