To ensure a stable FiO2 under varying patient demands, what must an O2 delivery system do?
a. It must have a reservoir system at least equal to the VT.
b. It must provide all the gas needed by the patient during inspiration.
c. It must maintain flows that are at least equal to the patient's peak flows.
d. It must be able to deliver any O2 concen-tration from 21% to 100%.
ANS: B
If the system provides all of the patient's inspired gas, the FiO2 remains stable, even under changing demands.
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