Helium must always be combined with at least how much O2?
a. 20%
b. 30%
c. 40%
d. 50%
ANS: A
He must always be combined with at least 20% O2. The higher the concentration of O2 used in a heliox mixture, the less likely it is that heliox would be beneficial. Heliox mixtures of less than 60% He are rarely used clinically.
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