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. 2020 Mar 24;10:35. doi: 10.1186/s13613-020-00651-1

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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. 1 — Relationships between pulmonary dead-space fraction (V_D/V_T) and the microcirculatory blood flow at baseline and 24 h after. a Scatter plot depicting the correlation between pulmonary dead-space fraction (V_D/V_T) and the proportion of small vessels perfused at baseline. b Scatter plot depicting the correlation between pulmonary dead-space fraction (V_D/V_T) and the proportion of small vessels perfused 24 h after. c Scatter plot depicting the correlation between pulmonary dead-space fraction (V_D/V_T) and MFI at baseline. d Scatter plot depicting the correlation between pulmonary dead-space fraction (V_D/V_T) and MFI 24 h after. PPV: percentage of small vessels perfused; V_D/V_T: pulmonary dead-space fraction; HI: heterogeneity index of microcirculatory blood flow; MFI: microcirculatory blood flow index