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. 2022 Apr 15;26:109. doi: 10.1186/s13054-022-03973-7

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© The Author(s) 2022

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/. 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 in a credit line to the data.

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Fig. 3 — Changes of PaCO₂, respiratory rate, SpO₂ and Borg dyspnea score within 72 h after randomization between the two groups. Data are presented as median (interquartile range). COT conventional oxygen therapy group, HFNC high-flow nasal cannula group, PaCO₂ arterial partial pressure of carbon dioxide, SpO₂ oxygen saturation