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. 2022 Jul 22;22:273. doi: 10.1186/s12883-022-02801-3

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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. 1 — Left and right NPi (left y-axis) and their difference (right y-axis) for two patients with stroke measured several times during the day. The presence of an NPi differential is indicated by the horizontal dashed line at the cutoff value of 0.7 and arrows. Note how neither the left nor right NPi ever fell below the critical value of 3 (horizontal solid line). Modified Rankin Score at discharge (DC mRS) for these patients were 5 (poor outcome, upper panel) and 6 (death, lower panel)