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. 2021 Sep 30;11(10):989. doi: 10.3390/jpm11100989

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Changes in ROX index and SpO₂/FiO₂ ratio within 24 h from the HFNC initiation (a) ROX index (b) SpO₂/FiO₂ ratio. * p < 0.005 between groups. ROX = pulse oximetry/fraction of inspired oxygen/respiratory rate; SpO₂ = percutaneous oxygen saturation; FiO₂ = fraction of inspired oxygen; and HFNC = high-flow nasal cannula.