A ventilator for which the primary power source generates a gas flow that compresses another mechanism and causes the gas from inside the mechanism to be delivered to the patient is known as which of the following?
a. Single-circuit
b. Double-circuit
c. Closed loop
d. Open loop
ANS: B
In a double-circuit ventilator, the primary power source generates a gas flow that compresses a mechanism such as a bellows or "bag-in-a-chamber." The gas in the bellows or bag then flows to the patient. In a single-circuit ventilator, the primary power source travels directly to the patient. The closed and open loop refer to whether or not the ventilator has a feedback loop system.
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