F_IO₂ Delivery Increases During Inspiration While the BirdMark 7A Is

question 39

Multiple Choice

F_IO₂ delivery increases during inspiration while the BirdMark 7A is operating using air mix. Which of the following contribute to this fact?
I. Increasing pressure in the pressure chamber decreases air entrainment.
II. At 12 cmH₂O, the venturi gate closes.
III. After about 12 cmH₂O, gas flow through the circuit is source gas.
IV. Excess flow (source gas) is directed through the timing cartridge.

• A) I
• B) I and II
• C) I, II, and III
• D) I, II, III, and IV

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