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A 45-year-old man presents with a 3-day history of fever, right upper quadrant pain, and jaundice. He has a history of choledocholithiasis. On examination, temperature is 39.4°C, BP is 85/50 mmHg, HR is 122 bpm, and he is confused. RUQ ultrasound shows a dilated common bile duct of 14 mm with a shadowing calculus. Total bilirubin is 8.2 mg/dL, WBC is 22,000/µL, and alkaline phosphatase is markedly elevated. After initiating IV fluids and broad-spectrum antibiotics, what is the most appropriate next step?

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