Predictors of expiratory flow limitation measured by forced oscillation technique in COPD
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- 作者：Masashi Mikamo (1)
Toshihiro Shirai (1)
Kazutaka Mori (2)
Yuichiro Shishido (1)
Takefumi Akita (1)
Satoru Morita (1)
Kazuhiro Asada (1)
Masato Fujii (1)
Takafumi Suda (2) - 关键词：Broadband ; COPD ; Expiratory flow limitation ; Forced oscillation technique ; Tidal breathing
- 刊名：BMC Pulmonary Medicine
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：14
- 期：1
- 全文大小：750 KB
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26. The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-2466/14/23/prepub - 作者单位：Masashi Mikamo (1)
Toshihiro Shirai (1)
Kazutaka Mori (2)
Yuichiro Shishido (1)
Takefumi Akita (1)
Satoru Morita (1)
Kazuhiro Asada (1)
Masato Fujii (1)
Takafumi Suda (2)
1. Department of Respiratory Medicine, Shizuoka General Hospital, 4-27-1 Kita-Ando, 420-0881, Aoi, Shizuoka, Japan
2. Second Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Japan - ISSN：1471-2466
文摘
Background Expiratory flow limitation (EFL) during tidal breathing is common in patients with severe COPD, and a major determinant of dynamic hyperinflation and exercise limitation. EFL can be measured by the forced oscillation technique (FOT); however, the relevance to clinical parameters is not fully understood. We hypothesized that emphysema extent and pulmonary function would contribute independently to the degree of EFL. Methods Broadband frequency FOT and pulmonary function tests were performed in 74 patients with COPD to derive respiratory system resistance (Rrs) and reactance (Xrs), and the EFL index as expressed by the differences between inspiratory and expiratory phases of Xrs at 5?Hz (ΔX5). Emphysema extent was measured by high-resolution computed tomography and scored. Results On the basis of the median value of ΔX5 (0.55 cmH2O/L/s), patients were classified into a high or low EFL index group. In multivariate regression analyses, a high EFL index was independently predicted by emphysema score, peripheral airway obstruction (forced expiratory flow between 25% and 75% of forced vital capacity), hyperinflation (functional residual capacity), and airway caliber (whole-breath Rrs at 5?Hz). Conclusions EFL measured by FOT is a global measure of COPD that has separable etiologies and is useful for evaluating the disease condition.