A volume-cycled ventilator has a rate knob for setting the controlled frequency of breathing. If this control is set to 12/min, which of the following other settings will determine the inspiratory and expiratory times?
1. FiO2
2. Flow
3. Volume
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: C
When a rate control is used, inspiratory and expiratory times will vary according to other control settings, such as flow and volume.
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