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. 2020 Feb 13;48(3):e200–e208. doi: 10.1097/CCM.0000000000004141

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Copyright © 2019 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the Society of Critical Care Medicine and Wolters Kluwer Health, Inc.

This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — Absolute and relative changes in expiratory normalized gas (V_N) and blood volumes (QN). V_N (A) and Q_N (B) within each region, and fractional expiratory mass of the lung in expiration (FAM_exp) grouping. C, Effects of an inspiratory breath upon V_N. In the higher FAM_exp groups there is relatively less ventilation occurring in the dependent regions. D, Effects of an inspiratory breath upon Q_N. Minimal change was seen in normalized blood volume in the FAM_exp less than 20% group, however, in the other conditions the normalized blood volume in the dependent region increased and those in the others decreased with inspiration. Points represent mean and either sd (A and B) or 95% CI of change (C and D).