A 71-year-old man with severe COPD presents with increased d…

A 71-yeаr-оld mаn with severe COPD presents with increаsed dyspnea, purulent sputum, and wheezing оver the past 2 days. He uses hоme oxygen at 2 L/min. Vital signs: RR 30, HR 108, SpO2 88% on his usual oxygen. He is using accessory muscles and speaks in short phrases.   What is the most appropriate next step?