Review Question - QID 212571

A 55-year-old man is brought to the emergency department by ambulance for evaluation of abdominal pain. He developed pain this morning that radiates into his back with nausea and several episodes of vomiting. He has been unable to tolerate any oral intake. He has a medical history of HIV and alcohol use disorder, and is not currently taking any medications. His temperature is 97.5°F (36.4°C), blood pressure is 100/67 mmHg, pulse is 98/min, respirations are 15/min, and oxygen saturation is 97% on room air. On physical exam, the patient is in acute distress due to pain. The abdomen is soft and non-distended. There is notable epigastric tenderness to palpation. The remainder of the physical exam is unremarkable. Serum lipase level is 800 U/L. Which of the following is the most appropriate next step in management?