A 70 kg (154 lb) patient with emphysema receives mechanical…
A 70 kg (154 lb) patient with emphysema receives mechanical ventilation. Current ventilator settings are as follows: SIMV VC, Vt 550 mL, RR 12/min, FiO2 30%. The patient is awake and alert and does not appear to be in any distress. The total RR is 14/min. ABG results are: pH 7.35, PaCO2 58, PaO2 65, HCO3- 30. His SpO2 is 94% and MIP is -30 cmH2O. This patient is most likely: