During a patient transport with the Impact Uni-Vent 750, the respiratory therapist hears a whis-tling sound. What is the most likely cause of this whistling?
a. The "PEEP not set" alarm is currently ac-tive.
b. The "battery low/fail" alarm is being vio-lated.
c. The patient flow is greater than the set flow.
d. The demand valve has opened, and gas is passing through.
ANS: C
The patient valve serves the function of an exhalation valve and contains the antiasphyxia valve. If the flow setting is insufficient for the inspiratory demands of the patient, the antiasphyxia valve allows room air to be entrained for additional flow. When air entrainment occurs, the valve creates a whistling sound.
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