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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

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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).

Conclusion: Patients with COPD whose RV/TLC changed from normal to abnormal showed deterioration of pulmonary function and worsening of CT parameters simultaneously.

Keywords: Chronic obstructive lung disease; Emphysema; Residual volume; Total lung capacity.
Author(s)
오연목이상도이재승Chin Kook RheeJeong Uk LimJi-Hyun LeeKorean Obstructive Lung Diseas
Issued Date
2021
Type
Article
Keyword
chronicc obstructive lung diseaseemphysemaresidual volumetotal lung capacity내과학
DOI
10.3904/kjim.2019.425
URI
https://oak.ulsan.ac.kr/handle/2021.oak/7107
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_nrf_kci_oai_kci_go_kr_ARTI_9777980&amp;context=PC&amp;vid=ULSAN&amp;lang=ko_KR&amp;search_scope=default_scope&amp;adaptor=primo_central_multiple_fe&amp;tab=default_tab&amp;query=any,contains,Clinical%20impact%20of%20long-term%20change%20in%20air%20trapping%20on%20pulmonary%20function%20and%20computed%20tomography%20parameters%20in%20chronic%20obstructive%20pulmonary%20disease&amp;offset=0&amp;pcAvailability=true
Publisher
The Korean Journal of Internal Medicine
Location
대한민국
Language
영어
ISSN
1226-3303
Citation Volume
36
Citation Number
3
Citation Start Page
636
Citation End Page
646
Appears in Collections:
Medicine > Medicine
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