A 70-kg (154 lb) patient with emphysema is receiving mechanical ventilation. Current ventilator settings are as follows: VC, SIMV; VT 550 mL, respiratory rate 12/min, FIO2 0.30. The patient is awake and alert and does not appear to be in any distress. The total respiratory rate is 14/min. ABG results are as follows: pH 7.35, PaCO2 58 torr; PaO2 65 torr; HCO3 30 mEq/L. His SpO2 is 94% and MIP is -30 cm H2O. This patient is most likely

A. ready for a spontaneous breathing trial.
B. in an acute exacerbation.
C. oversedated.
D. in need of PEEP therapy.


Answer: A. ready for a spontaneous breathing trial.

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