Abdominal Pain and Its Aftermath

A 69-year-old woman with a history of atrial fibrillation, coronary artery disease (CAD) status/post coronary artery bypass graft, type 2 diabetes mellitus (T2DM), and current tobacco use presents to the emergency department with postprandial abdominal pain. She states that the pain started 6 months earlier and is a generalized dull abdominal pain. She reports that the pain usually resolves within 1-2 hours after eating and that defecation sometimes provides relief. She has no nausea, emesis, melena, hematochezia, or changes in bowel/urinary habits. However, she reports a 25 lbs (11 kg) unintentional weight loss during this time frame.

On physical examination, she is in mild distress but hemodynamically stable. There is tenderness of all abdominal quadrants. There is no organomegaly, guarding, rigidity, or costovertebral angle tenderness appreciated.

Which one of the following is the most appropriate next diagnostic test?

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