2liter a volume, not: a dosage. Dosage=a quantity per unit time. 2 Liters/min oxygen flow by nasal cannula is a commonly used adjunctive oxygen flow for people with lung ventilation/perfusion problems: https://en.wikipedia.org/wiki/Ventilation/perfusion_ratio. What counts is oxygen saturation of hemoglobin as percentage, not dosage. Too much oxygen, esp. over days/weeks, is also toxic; yet uncommon without intubation.
Answered 5/4/2019
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