During high-frequency oscillation ventilation (HFOV), how is fresh gas supplied with the ventilator circuit?
A. through an oscillator
B. through an entrainment port influenced by the oscillation rate
C. via bias flow
D. by the size of the ETT
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: During HFOV, fresh gas is supplied with the ventilator circuit as a bias flow. The mean airway pressure is adjusted by the relationship between fresh gas inflow and any positive or negative pressure placed on the gas outflow from the bias flow circuit.
D. Incorrect response: See explanation C.
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