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. 2020 Jul;17(7):829–838. doi: 10.1513/AnnalsATS.201909-666OC

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Copyright © 2020 by the American Thoracic Society

This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (http://creativecommons.org/licenses/by-nc-nd/4.0/). For commercial usage and reprints, please contact Diane Gern (dgern@thoracic.org).

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Figure 4. — Correlation between reduction in hyperinflation (RV) and RV/TLC ratio, and changes from baseline to 12 months, for postbronchodilator FEV₁; 6MWD; the SGRQ; and EXACT-PRO, dyspnea domain. Data are for the Zephyr Valve group. 6MWD = 6-minute-walk distance; BD = bronchodilator; EBV = Zephyr endobronchial valve; EXACT-PRO = EXAcerbations of Chronic pulmonary disease Tool–Patient-Reported Outcome; FEV₁ = forced expiratory volume in 1 second; RV = residual volume; SGRQ = St. George’s Respiratory Questionnaire; TLC = total lung capacity.