Herald Bleeding: A Diagnosis of Aorto-Duodenal Fistula Treated with Graft Within a Graft Repair

Abstract

Purpose: Introduction: An aortoenteric fistula is a communication between the aorta and an adjacent loop of the bowel. Secondary aortoenteric fistula is an uncommon but very important complication of abdominal aortic reconstruction. Herald bleeding sometimes precedes a catastrophic bleed. We report a case with this rare complication with typical herald bleeding treated with endovascular graft repair. Case report: An 80-year-old Caucasian male with a history of abdominal aortic aneurysm repair 18 years ago with a tube graft, presented with back pain, and vomiting “bloody slime.” He was on aspirin, but denied taking non-steroidal anti-inflammatory drugs or blood thinners. On examination, he was afebrile, his heart rate was 108/min and blood pressure was 101/53 mm Hg. His hemoglobin was 6.4 g/dL. He received packed red cells transfusion. An endoscopy was performed which revealed a large adherent clot in the third portion of the duodenum. This was not removed as there was a concern for aorto-enteric fistula. A review of previous CT scan revealed a closely adherent tube graft to the duodenum. Patient was deemed to be a poor surgical candidate and an endovascular graft repair was performed using a stent graft with CO2 angiography. A repeat upper endoscopy after removal of the adherent clot showed the previous aortic graft eroding through the duodenal wall, but there was no active bleeding. Patient had no further episodes of bleeding and was discharged with a close follow up. Discussion: Aorto-duodenal fistulas (ADF) after endovascular abdominal aneurysm repair are rare. Secondary ADF is an uncommon (0.3-2%) and life-threatening, long-term complication of aortic reconstructive surgery. The classic presentation of an aortoduodenal fistula is that of a “herald bleed” (brief, with spontaneous resolution), followed anywhere from hours to weeks later by a massive upper gastrointestinal bleed. Untreated cases have a mortality rate of up to 100%. In our patient, intermittent hematemesis was a warning symptom. Though laparotomy with repair is the treatment of choice, our patient was treated with graft within a graft repair in view of the comorbidities. In summary we report a rare case of aorto-duodenal fistula treated with endovascular graft repair.Figure: Visible aortic graft in the duodenum.