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. 2018 Jan 24;18:14. doi: 10.1186/s12890-018-0576-x

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Percentage decrease in capillary PCO₂ in COPD patients after 1 h of NHF breathing under different experimental conditions. * = p < 0.05 vs. baseline; baseline PCO₂ > 55 mmHg, a: n = 14, b: n = 11, c: n = 9, d: n = 9