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. 2017 May 23;7:56. doi: 10.1186/s13613-017-0279-0

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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.

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Fig. 3 — Receiver-operating characteristic (ROC) curves showing the diagnostic ability of volume expansion and PLR-induced changes in PtcO₂ to predict volume responsiveness. PLR, passive leg raising. PtcO₂, transcutaneous partial pressure of oxygen. n = 34, *p < 0.05 for the comparison between areas under the curves