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. 2011 Jul 25;15(4):R175. doi: 10.1186/cc10324

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Copyright ©2011 Charron et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comparison between measured VD_physiol/V_Tand estimated VD_physiol/V_T[14]using a Bland and Altman representation (left) and a linear correlation (right). (A) and (B) Comparison for each paired data set (n = 78) in the supine position and after 3, 6, 9, 12 and 15 hours in the prone position. (C) and (D) Comparison of changes in VD_physiol/V_Tassessed according to the two methods between each time of measurement and the previous one. VD_physiol/V_T: ratio of physiological dead space to tidal volume.