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. 2017 May 2;18:76. doi: 10.1186/s12931-017-0542-9

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© The Author(s). 2017

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. 3 — Cardiac output at baseline, after 6 weeks NIV during spontaneous breathing and under NIV. Cardiac output during spontaneous breathing is shown in the filled areas and under NIV in the dashed areas. Data are presented in two groups: (i) patients that started with LI-NIV followed by HI-NIV are shown in green, and (ii) patients that started with HI-NIV followed by LI-NIV are shown in purple