A 58-year-old man with a history of three previous abdominal surgeries presents with acute onset colicky abdominal pain, abdominal distension, and vomiting for 8 hours. On examination, he is haemodynamically stable, abdomen is distended with visible peristaltic waves, and bowel sounds are high-pitched and tinkling. Plain abdominal X-ray shows dilated small bowel loops with air-fluid levels and a transition zone. What is the most appropriate next step in management?