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Contributors of the Severity of Airflow Limitation in COPD Patients

Title
Contributors of the Severity of Airflow Limitation in COPD Patients
Author
김태형
Keywords
Pulmonary Disease; Chronic Obstructive; Forced Expiratory Volumes; Tomography; X-Ray Computed
Issue Date
2012-01
Publisher
The Korean Academy Of Tuberculosis And Respiratory Diseases
Citation
Tuberculosis and Respiratory Diseases, 권: 72, 호: 1, 페이지 ;8-14
Abstract
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.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.
URI
https://synapse.koreamed.org/DOIx.php?id=10.4046/trd.2012.72.1.8
ISSN
1738-3536
DOI
10.4046/trd.2012.72.1.8
Appears in Collections:
COLLEGE OF MEDICINE[S](의과대학) > MEDICINE(의학과) > Articles
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