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. 2020 Dec;8(24):1688. doi: 10.21037/atm-20-4984

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2020 Annals of Translational Medicine. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Functional EIT images representing tidal variation (left) and relative impedance (ΔZ) curves (right) from one patient with acute exacerbation of chronic obstructive pulmonary disease under assist-control ventilation. The tidal variation does not change much before versus after bronchodilator administration (left top vs. left bottom image). The global impedance curve shows a decrease in end-expiratory lung impedance 60 minutes post-bronchodilation (right top image), mainly caused by the changes in the dorsal regions (right bottom image) rather than the ventral regions (right middle image). EIT, electrical impedance tomography; AU, arbitrary unit.