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Longitudinal lung volume changes in patients with chronic obstructive pulmonary disease
- Longitudinal lung volume changes in patients with chronic obstructive pulmonary disease
- Lee J.S.; Kim S.O.; Seo J.B.; Lee J.-H.; Kim E.K.; Kim T.-H.; Kim W.J.; Lee J.H.; Lee S.-M.; Lee S.; Lim S.Y.; Shin T.R.; Yoon H.I.; Lee S.W.; Huh J.W.; Oh Y.-M.; Lee S.-D.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Lung vol. 191, no. 4, pp. 405 - 412
- SCI; SCIE; SCOPUS
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- Background: The progression of lung hyperinflation in patients with chronic obstructive pulmonary disease (COPD) has not been studied in a long-term prospective cohort. We explored the longitudinal changes in lung volume compartments with the aim of identifying predictors of a rapid decline of the inspiratory capacity to total lung capacity ratio (IC/TLC). Methods: The study population comprised 324 patients with COPD who were recruited prospectively. Annual rates of changes in pulmonary function, including forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC), total lung capacity (TLC), functional residual capacity (FRC), residual volume (RV), vital capacity (VC), IC, and IC/TLC, were estimated using the random coefficient models. Results: The mean annual rates of changes in pre- and post-bronchodilator FEV1 were -23.0 mL/year (p < 0.001) and -26.5 mL/year (p = 0.004). The mean annual rates of changes in VC, IC, TLC, and IC/TLC were -33.7 mL/year (p = 0.007), -53.9 mL/year (p < 0.001), -43.7 mL/year (p = 0.012), and -0.65 %/year (p = 0.001), respectively. RV, FRC, and RV/TLC did not change significantly during the study period. Multivariate logistic regression analysis showed that a high modified Medical Research Council (MMRC) dyspnea scale score, a high Charlson comorbidity index value, and low post-bronchodilator FEV1 were associated with rapid decline in IC/TLC. Conclusion: MMRC dyspnea scale, post-bronchodilator FEV1, and the Charlson comorbidity index at baseline were independent predictors of a rapid decline in IC/TLC. © 2013 Springer Science+Business Media New York.
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