Arterial infections in the new millenium: an old problem revisited.

The natural history of infected aneurysms or arterial infections is characterized by rapid expansion leading to rupture, pseudoaneurysm formation, and sepsis. Treatment options include in situ grafting either with prosthetic or autogenous grafts or with cryopreserved allografts (CPAs), resection of the aneurysm with remote bypass grafting, and ligation. The purpose of this study was to review our recent experience with these infections and to present long-term follow-up with in situ CPAs. From January 2000 through June 2005, we treated nine patients with infected aneurysms and one patient with an infection without aneurysm formation. The infection involved the infrarenal abdominal aorta in six patients and the femoral artery in three patients. One patient had an infected splenic artery aneurysm. Aortic rupture occurred in five of the six patients with infected aortas. Two of the three patients with infected femoral aneurysms presented with recurrent hemorrhage. Of the six patients with aortic infections, five were treated with in situ CPAs. One patient was treated with aortic resection and axillofemoral grafting. Two patients with femoral aneurysms were treated with in situ CPAs, and the third patient underwent aneurysm resection and prosthetic grafting through the obturator foramen. The patient with the splenic aneurysm underwent combined valve replacement, aneurysm resection, and splenectomy. Three of the six patients with aortic infections died postoperatively, all of whom were septic at presentation. The cause of death in these three patients was multiple organ failure in two and overwhelming sepsis in one. The three survivors are alive and well with up to 5-year follow-up. The three patients with infected femoral aneurysms are alive and well with follow-up extending to 44 months. The patient with the splenic aneurysm is doing well. No recurrent infections have been noted among the survivors. The CPAs have remained structurally intact in all. The mortality rate among patients with abdominal aortic infections remains high and is likely related to their preoperative septic state. In situ grafting with CPAs appears to be a reasonable treatment option for arterial infections. CPAs appear to maintain their structural integrity and to be resistant to recurrent infection.