Stress ulcers Quiz: Ace Your Exams

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A 23-year-old man is hospitalized with multiple injuries after a motorcycle accident. On day 10 of his hospital stay, he has coffee-ground emesis. Temperature is 36.8 °C (98.2 °F), pulse is 94/min, respirations are 16/min, blood pressure is 130/82 mmHg, and oxygen saturation is 99% on room air. Rectal exam is notable for black, occult-positive stool. His hemoglobin had been steadily declining the last couple of days, and is now 7.1 g/dL. Coagulation studies are within normal limits. What is the next step in the evaluation of this patient?  

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