Which type of ventilator creates a sinusoidal pressure waveform pattern of positive and negative pressures?
a. Fluidic c. Positive-pressure
b. Pneumatic d. Combined-pressure
ANS: D
A combined-pressure device, such as a high-frequency oscillator, produces oscillating gas pres-sure waveforms at the upper airway, producing a waveform that is sinusoidal, with posi-tive-pressure and negative-pressure oscillations produced at the upper airway.
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