Which of the following types of high-frequency ventilation involves the delivery of pulsations under pressure through a small lumen at rates of 1.7 to 10 Hz?
a. Jet c. Positive-pressure
b. Oscillatory d. Flow interruption
ANS: A
High-frequency jet ventilation operates by passing gas from a high-pressure source through a var-iable regulator that reduces the pressure to the desired working level. The gas passes through a device, usually a solenoid or a fluidic valve, which governs the amount and duration of flow. The gas jet is delivered through a specially made triple-lumen endotracheal tube, which is similar to conventional endotracheal tubes except that two additional small lines are added. One line is for delivering jet ventilation, and the other is for monitoring distal airway pressures.
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