Which of the following is the technique that can actively remove gas from a ventilator circuit at the beginning of expiration?
a. Expiratory pause c. Positive end-expiratory pressure
b. Inspiratory pause d. Negative end-expiratory pressure
ANS: D
If negative pressure is applied on exhalation, the decrease in pressure draws air out of the venti-lator circuit. An expiratory pause facilitates the measurement of auto-PEEP. An inspiratory pause facilitates the calculation of static pressure and transairway pressure. Positive end-expiratory pressure is positive pressure applied on exhalation and facilitates the improvement of oxygena-tion.
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