preoxygenation
noun
pre·ox·y·gen·ation
-ˌäk-si-jə-ˈnā-shən, -äk-ˌsij-ə- 
: inhalation of large quantities of essentially pure oxygen usually as a prelude to some activity or medical procedure in which it is desirable to minimize nitrogen and maximize oxygen in the blood and tissues
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“Preoxygenation.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/preoxygenation. Accessed 23 Nov. 2024.
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