Partial ventilatory support can be provided by which of the following ventilator modes?
1. Pressure-controlled continuous mandatory ventilation (PC-CMV) set rate 8 breaths/min
2. Volume-controlled intermittent mandatory ventilation (VC-IMV) set rate 4 breaths/min
3. Pressure-controlled intermittent mandatory ventilation (PC-IMV) set rate 10 breaths/min
4. VC-MMV set Ve8 L/min
a. 1 and 2 only
b. 2 and 3 only
c. 2 and 4 only
d. 3 and 4 only
ANS: C
Continuous mandatory ventilation (CMV) is a full ventilatory support mode. Therefore, a pres-sure-controlled continuous mandatory ventilation (PC-CMV) rate of 8 breaths/min is not partial ventilatory support. A ventilator rate setting of 8 breaths/min or more is also considered full sup-port. Therefore, even though pressure-controlled intermittent mandatory ventilation (PC-IMV) could be partial ventilatory support, it is full support because of the set rate of 10 breaths/min. Volume-controlled intermittent mandatory ventilation (VC-IMV) with a set rate of 4 breaths/min is partial ventilatory support and MMV can be partial ventilatory support when the patient is par-ticipating in the work of breathing (WOB) to maintain effective alveolar ventilation.
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