Why have so few HFV studies on adult patients been conducted?
A. because high-frequency ventilators lack adequate ventilation capabilities for adult subjects
B. because adult subjects cannot tolerate receiving a Vt smaller than the Vd
C. because the high mean airway pressures produced by high-frequency ventilators are likely to induce barotrauma in adults
D. because adult subjects are incapable of enduring such high ventilation frequencies
ANS: A
A. Correct response: Adult experience with HFV has been limited because devices with adequate ventilation capabilities for adults are few. Early jet devices have shown to provide reasonable gas transport with lower peak airway pressures in adult respiratory failure. Oscillators with the capabilities to support gas exchange in the adult have been more recently introduced and have shown the capability to support gas exchange safely.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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