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. 2020 Apr 7;10:39. doi: 10.1186/s13613-020-00654-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Association between pendelluft volume change during the study and markers of increased inspiratory effort in exemplary patients of the high-pendelluft group. In some patients of the high-pendelluft group, pendelluft volume increase from baseline was associated with markers of increased inspiratory effort such as increased respiratory rate (panel a) or increased mouth occlusion pressure at 100 ms (p0.1, panel b), or ventilatory inefficiency such as increased end-tidal carbon dioxide (EtCO₂, panel c). Significant correlations are marked with asterisks (*)