The volume delivered by a time-triggered, pressure-limited, time-cycled infant ventilator depends directly on which of the following ventilator parameters?
1. Flow rate
2. Pressure limit
3. Respiratory rate
4. Inspiratory time
a. 1 and 2 c. 1, 2, and 4
b. 2 and 3 d. 2, 3, and 4
ANS: C
The volume delivered by a pressure-limited, time-triggered, time-cycled ventilator depends on the pressure setting, the flow rate, and the inspiratory time. The respiratory rate is not directly related to volume. It determines the total cycle time and expiratory time because inspiratory time is set. In the case of a set ratio of inspiratory time to expiratory time, the respiratory rate deter-mines the inspiratory time, which is directly related to the volume delivered.
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