The mode of ventilation that provides pressure-limited, time-cycled breaths that use a set tidal volume as a feedback control is which of the following?
a. Pressure support ventilation (PSV)
b. Pressure-regulated volume control (PRVC)
c. Pressure-controlled continuous mandatory ventilation (PC-CMV)
d. Bilevel positive airway pressure (Bilevel PAP)
ANS: B
Pressure support ventilation (PSV) is pressure-limited and flow-cycled. Pressure regulated vol-ume control (PRVC) is a dual control mode of ventilation that provides the benefits of pressure breathing along with targeting a set volume. These breaths are pressure-limited, time-cycled, and use tidal volume as a feedback. The pressure is adjusted by the ventilator to meet the set volume. Pressure-controlled continuous mandatory ventilation (PC-CMV) is pressure-limited and time-cycled but does not have a volume feedback system. Bilevel PAP is similar to PC-CMV in that it is pressure-limited and time-cycled with no volume feedback.
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