Which level of FiO2 and what time of exposure has been associated with oxygen toxicity? 1. FiO2 of 0.5 2. FiO2 of 0.7 3. FiO2 of 0.6 4. 24 to 48 hr

a. 1 and 2 only
b. 3 and 4 only
c. 2 and 3 only
d. 1 and 4 only

ANS: B
An FiO2 of 0.5 or more for longer than 24 to 48 hr is associated with the development of oxygen toxicity.

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