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. 2017 Jun 17;17:91. doi: 10.1186/s12890-017-0434-2

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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. 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.

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Fig. 4 — Mean EAdi values during NPPV (blue bars) and spontaneous breathing (red bars). Notice that EAdi is smaller on NPPV compared to spontaneous breathing on Days 1 and 2, but not on Day 3. Bars represent the mean and error bars represent the standard deviation. EAdi: Electrical activity of the diaphragm; NPPV: Noninvasive Positive Pressure Ventilation