A 57-year-old female patient with emphysema has the following ABG results:

A 57-year-old female patient with emphysema has the following ABG results:

 pH 7.34

PaCO2 65 torr

PaO2 47 torr

HCO3 31 mEq/L

BE +6

She is showing signs of shortness and has inspiratory crackles on auscultation. Which of the following would you recommend for this patient?