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. 2021 Apr 15;203(8):1025–1027. doi: 10.1164/rccm.202012-4447LE

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Copyright © 2021 by the American Thoracic Society

This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/). For commercial usage and reprints, please contact Diane Gern (dgern@thoracic.org).

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Figure 1. — Correlation between recruitment-to-inflation (R/I) ratio and lung ultrasound (LUS) reaeration score. (A and B) The continuous line shows the linear regression (with 95% confidence interval in dashed lines) between the R/I ratio and the LUS reaeration score in 24 patients with coronavirus disease (COVID-19)–induced acute respiratory distress syndrome with and without airway opening pressure (AOP) >5 cm H₂O (A) and in the 16 patients without AOP >5 cm H₂O (B). Of note, the R/I ratio is a continuous variable, whereas the LUS reaeration score is a discrete variable in the linear regression.