A 56-year-old man with alcohol-related cirrhosis presents with profuse vomiting of blood. He is agitated, intermittently drowsy and repeatedly coughing while blood fills his mouth; oxygen saturation is 91% despite high-flow oxygen. His blood pressure is 94/60 mmHg, and urgent endoscopy is being prepared. Which one of the following should be undertaken first?
Keep going — a set of ten like this one, one at a time.
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