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Desaturation time related to ambient oxygen fraction during apneic oxygenation

Desaturation time related to ambient oxygen fraction during apneic oxygenation
The time (duration of apnea) required to reach 50% SaO2 with an open airway exposed to various ambient O2 fractions, based on computational modeling. Note that increasing the ambient oxygen fraction during apneic oxygenation from 0.9 to 1.0 more than doubles the time to desaturation compared with increasing the ambient oxygen fraction from 0.21 to 0.9
SaO2: arterial oxyhemoglobin saturation; O2: oxygen.
From: McNamara MJ, Hardman JG. Hypoxaemia during open-airway apnoea: a computational modelling analysis. Anaesthesia 2005; 60(8):741-6. https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-2044.2005.04228.x. Copyright © 2005 Association of Anaesthetists. Reproduced with permission of John Wiley & Sons Inc. This image has been provided by or is owned by Wiley. Further permission is needed before it can be downloaded to PowerPoint, printed, shared or emailed. Please contact Wiley's permissions department either via email: permissions@wiley.com or use the RightsLink service by clicking on the 'Request Permission' link accompanying this article on Wiley Online Library (http://onlinelibrary.wiley.com).
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