A postoperative patient, still under anesthesia, is being ventilated with VC-CMV with automode. After 2 hours, the patient is waking up and beginning to breathe spontaneously. The ventilator will respond by _____________________
a. switching to the pressure support mode
b. switching to the volume support mode
c. delivering time-triggered, pressure-limited breaths
d. ensuring minimum mandatory minute ven-tilation
ANS: B
If a postoperative patient is still recovering from the effects of anesthesia and the ventilator op-erator has selected volume-controlled continuous mandatory ventilation (VC-CMV) with auto-mode as the operating mode, all breaths are mandatory (time triggered, volume limited, and time cycled). If the patient begins to trigger breaths, the ventilator switches to VS (patient triggered, pressure limited, and flow cycled with a volume target) and remains in this mode as long as the patient is breathing spontaneously.
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