The therapist is using an O2-powered breathing device that is being manually triggered. Each time the therapist depresses the actuator, he continues to depress the actuator. What effect will maintaining pressure on the actuator have on the inspiratory time?
A. It will have no influence on the inspiratory time.
B. It will prolong the inspiratory time because inspiration will be maintained as long as the actuator is depressed.
C. Inspiration will automatically be terminated after 3 seconds despite depressing the actuator continuously.
D. Maintaining pressure on the actuator will cause multiple inspirations to be triggered.
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: O2-powered breathing devices (OPD) are frequently called demand valves. A typical OPD consists of a demand valve that can be manually triggered or patient triggered. Newer OPDs limit the available airway pressure via a pressure-limiting valve, and limit the length of the inspiratory time. In terms of the inspiratory time, inspiration is terminated after 3 seconds elapse, even if the operator continues to depress the actuator. Therefore maintaining pressure on the actuator for a prolonged period will have no influence on the inspiratory time.
D. Incorrect response: See explanation C
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