17. 58 yo M h/o COPD, HTN, tobacco abuse presents to the ED with 3 days of worsening dyspnea, as well as cough with increasing sputum volume and purulence. His exam is significant for rhonchi and wheezes bilaterally. CXR shows no focal infiltrate. Vitals: HR 114, BP 115/72, temp 98.4 F, RR 26, O2 sat 89% on RA. ABG shows: pH of 7.29, pCO2 58, PO2 65 (normal 7.4/40/90). HCO3 is 28 (normal 24). You initiate albuterol, ipatropium. What additional treatment plan would you recommend?