How does exhalation occur during high-frequency jet ventilation?
A. Lung elastic recoil causes exhalation to be passive.
B. Exhaled air pulses out of the lungs between inspiratory pulsations.
C. Exhaled air becomes entrained with reverse oscillations.
D. Exhalation relies on the development of subatmospheric pressure generated immediately following an inspiration.
ANS: A
A. Correct response: With high-frequency jet ventilation, exhalation is passive because of the elastic recoil of the lungs. With a jet ventilator, the therapist usually has control over the rate, inspiratory time, jet "drive pressure," and expiratory pressure.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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