One type of threshold resistor used to create continuous positive airway pressure is which of the following?
a. Bennett valve c. Underwater seal
b. Sliding Venturi d. Oscillator cartridge
ANS: C
The underwater seal resistor has tubing attached to the expiratory port of the circuit and is sub-merged under a column of water. The level of continuous positive airway pressure is determined by the height of the column.
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