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Clinical impact of long-term change in air trapping on pulmonary function and computed tomography parameters in chronic obstructive pulmonary disease

Authors :
Jeong Uk Lim
Jae Seung Lee
Ji-Hyun Lee
Sang-Do Lee
Yeon-Mok Oh
Chin Kook Rhee
for the Korean Obstructive Lung Disease (KOLD) Study Group
Source :
The Korean Journal of Internal Medicine, Vol 36, Iss 3, Pp 636-646 (2021)
Publication Year :
2021
Publisher :
The Korean Association of Internal Medicine, 2021.

Abstract

Background/Aims Air trapping is associated with unfavorable outcomes in chronic obstructive pulmonary disease (COPD). The present study evaluated the association between longitudinal changes in air trapping with pulmonary function, computed tomography (CT) parameters and exacerbation. Methods Patients enrolled in the Korean Obstructive Lung Disease (KOLD) study cohort from June 2005 to October 2015 were included. The study patients were categorized into four groups according to the change in residual volume to total lung capacity ratio (RV/TLC) over 3 years. The RV/TLC was considered abnormal when it was ≥ 40% and normal when it was < 40%. Results A total of 279 patients were categorized into four groups: 76 in the “normal to normal” (N→N) group, 34 in the “abnormal to normal” (A→N) group, 33 in the “normal to abnormal” (N→A) group, and 136 in the “abnormal to abnormal” (A→A) group. For forced expiratory volume in 1 second and forced vital capacity (FVC), respectively, group A→N showed a large increase of 266 mL (p < 0.001) and 381 mL (p < 0.001), group N→A showed a marked decrease of 216 mL (p < 0.001) and 332 mL(p = 0.029), and group A→A showed a decrease of 16 mL (p = 0.426) and 6 mL (p = 0.011) compared to group N→N. Group A→N showed a significant decrease of −0.013 in expiratory to inspiratory ratio of the mean lung density (p < 0.001), while group A→N showed an increase of 0.005 (p < 0.001). Conclusions Patients with COPD whose RV/TLC changed from normal to abnormal showed deterioration of pulmonary function and worsening of CT parameters simultaneously.

Details

Language :
English
ISSN :
12263303 and 20056648
Volume :
36
Issue :
3
Database :
Directory of Open Access Journals
Journal :
The Korean Journal of Internal Medicine
Publication Type :
Academic Journal
Accession number :
edsdoj.17dfe8fbcfbf43cc8894117cc09e3f84
Document Type :
article
Full Text :
https://doi.org/10.3904/kjim.2019.425