A 64-year-old man afflicted with severe emphysema, who receives oxygen therapy at home, is admitted to the hospital because of upper gastrointestinal bleeding. The bleeding ceases soon after...

A 64-year-old man afflicted with severe emphysema, who receives oxygen therapy at home, is admitted to the hospital because of upper gastrointestinal bleeding. The bleeding ceases soon after admission, and the patient becomes agitated and then disoriented. he is given intramuscular diazepam Valium, 5mg. Twenty minutes later he is unresponsive. Physical examination reveals a stuporous but arousable man who has papilledema and asterixis. Arterial blood gases are pH7.17;PO2 42kPa;PCO2 95kPa. The best immediate therapy would be to() A)Correct hypoxemia with high-flow nasal oxygen B) Correct acidosis with sodium bicarbonate C) Administer intravenous dexamethasone,10mg D) Call for neurosurgical consultation E)Take to the operation room for operation