Every breath from the ventilator is time or patient triggered, pressure limited, and time cycled. This describes which of the following ventilator modes?
a. Pressure support ventilation (PSV)
b. Continuous positive airway pressure (CPAP)
c. Pressure-controlled continuous mandatory ventilation (PC-CMV)
d. Volume-controlled intermittent mandatory ventilation (VC-IMV)
ANS: C
A mode in which the patient can receive a time triggered breath or a patient triggered breath is continuous mandatory ventilation (CMV or A/C). Pressure limited breaths that are either time or patient triggered occur in pressure-controlled continuous mandatory ventilation (PC-CMV), where the breath is also time cycled. Pressure support ventilation (PSV) breaths are always flow cycled. Continuous positive airway pressure (CPAP) breaths are always spontaneous, and vol-ume-controlled intermittent mandatory ventilation (VC-IMV) breaths are volume limited and volume cycled.
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