A physician places a patient in respiratory failure on 100% O2. To avoid the hazards of O2 tox-icity, you would recommend that every effort is made to reduce this FiO2 to less than 50% within what timeframe?
a. 8 hr
b. 24 hr
c. 48 hr
d. 5 days
ANS: D
Avoiding O2 toxicity: Limit patient exposure to 100% O2 to less than 24 hr whenever possible. High FiO2 is acceptable if the concentration can be decreased to 70% within 2 days and 50% or less in 5 days.
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