preoxygenation

noun
pre·​ox·​y·​gen·​ation | \ -ˌäk-si-jə-ˈnā-shən, -äk-ˌsij-ə- How to pronounce preoxygenation (audio) \

Medical Definition of preoxygenation

: 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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