Which of the following is a device that uses a flow resistor to create expiratory pressure?
a. Positive expiratory pressure mask
b. Downs continuous positive airway pres-sure generator
c. Modern ventilator
d. Fluidic device
ANS: A
Flow resistors are used in positive expiratory pressure masks to combat atelectasis and aid in the removal of secretions. They are used less commonly in ventilator circuits. The Downs continuous positive airway pressure generator uses a threshold resistor to generate positive pressure. Modern ventilators use threshold resistors to generate expiratory pressure. Fluidic devices do not use flow resistors.
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