The nurse anticipates that a patient returning from elective surgery will have ventilator settings most similar to which of the following?
1. SIMV with a rate of 12, V•T 750 mL, FIO2 .60
2. SIMV with a rate of 4, V•T 1,200 mL, FIO2 .60
3. assist-control with a rate of 16, V•T 1,000 mL, FIO2 .40
4. assist-control with a rate of 20, V•T 1,200 mL, FIO2 .60
1
Rationale: It is most likely that the ventilator settings would include the SIMV mode, which is often used for weaning patients from ventilators. The SIMV mode with a tidal volume of 1200 mL is too high. It is not unusual to begin with higher FIO2 (60 percent) and to titrate downward as the patient awakens from surgery. The choices with assist-control would not be as useful for early weaning of this patient following elective surgery because of the large tidal volumes.
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