Anastomotic aneurysms after vascular reconstruction: problems of incidence, etiology, and treatment.

To gain a better understanding of the pathogenesis, natural history, therapeutic response, and the potential of prevention of anastomotic aneurysms in general and those following aortofemoral interventions in particular, we have reviewed 4,214 reconstructive vascular operations performed in the past 15 years during which procedures (prosthetic bypass, autogenous vein graft, and endarteriectomy) of fairly uniform technical details have been used. Among these operations representing 9,561 anastomotic sites, we encountered 205 anastomic aneurysms, a per site incidence of 1.7 percent. By far the most common site of occurrence was the femoral artery following Dacron bypass procedures, with a per site incidence of 3.0 percent. The lowest rate of incidence was observed after endarteriectomies, regardless of anatomic location (0.4 percent). The most frequent causative factor was found to be structural deficiency of the parent artery, which accounted for 30.7 percent of the aneurysmal lesions. Other etiological agents, in order of importance, were arterial hypertension, mechanical stress, defect of the graft material, and noninfective healing complications. The therapeutic approach was an aggressive one and only patients with prohibitive operative risks were treated conservatively. In the elective surgical cases the rate of good results was 81.6 percent, with no operative deaths.