Abstract
Background: In chronic obstructive pulmonary disease (COPD), morphological analysis made by computed tomography (CT) is usually correlated with spirometry as the main functional tool. In this study, quantitative CT analysis (QCT) was compared with volumetric capnography (VCap), besides spirometry and 6-minute walk test (6MWT).
Methods: 27 patients with severe/very severe COPD were included, compared with 19 control subjects. All participants performed spirometry and chest high resolution CT scans, analysed with a fully automated software. The COPD group was also submitted to VCap and 6MWT.
Results: COPD patients (65.07±8.25 years) showed an average FEV1 of 1.2 L (44% of the predicted) and the control group (34.36±8.78 years). VCap x QCT: positive correlations were observed with bronchial wall thickening and negative correlations with diameter and area of the bronchial lumen. Spirometry x QCT: positive correlations were observed between post-BD: FVC, FEV1 and FEF25-75% and diameter and luminal area of the airways and, FVC and lung and vascular volumes (emphysema). Negative correlation between post-BD FVC and FEV1 when compared to Pi10 (internal perimeter of 10 mm). 6MWT vs. QCT: negative correlations were observed between distance covered: with relative wall thickness (airways) and, vascular volume and peripheral vascular volume (vasculature).
Conclusion: Relevant correlations between QCT and pulmonary function variables were found, including the VCap, highlighting the importance of structural analysis in conjunction with a multidimensional functional assessment. This is the first study to correlate airway and parenchyma QCT with VCap.
Footnotes
Cite this article as Eur Respir J 2022; 60: Suppl. 66, 285.
This article was presented at the 2022 ERS International Congress, in session “-”.
This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).
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