The set tidal volume is 500 mL. During the first breath, the exhaled volume measures 390 mL, with a peak pressure of 18 cm H2O
The second breath returns 460 mL, with 20 cm H2O. The third breath has a peak pressure of 22 cm H2O, with an exhaled volume of 500 mL. This can be described as what type of system?
a. Open-loop c. Single-circuit
b. Closed-loop d. Double-circuit
ANS: B
This is a closed-loop system because the ventilator is making changes to the pressure based on the exhaled tidal volume. The pressure is being increased incrementally, which increases the exhaled volume to the set tidal volume.
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