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Suspect an aortoenteric fistula in patients who present with an upper GI bleed if they have ever had a AAA repair. This occurs when a fistula forms between the abdominal aorta and the GI tract (most commonly the duodenum). Patients may present stable or may present critically-ill. Unstable patients with an upper GI bleed and a history of AAA repair should proceed to the OR for laparotomy.
Stable patient may undergo CT scanning and/or endoscopy. Bottom line: If a patient with a history of AAA repair presents with an upper GI bleed, rally your troops (GI, Surgery, etc) ASAP and don't mess around. If you are wrong, and the patient doesn't have a fistula, no big deal. If you are wrong, and the patient does have a fistula, the patient may very well die on you as you struggle to get a regular ICU bed.