Stent-Grafts Improve Secondary Patency of Failing Hemodialysis Grafts

Abstract

Purpose Failing hemodialysis grafts continue to pose a challenge in the care of patients with end-stage renal disease (ESRD). We review our experience using percutaneous stent-grafts for the treatment of venous outflow stenosis and occlusion in order to assess their efficacy in nonautologous graft salvage. Methods This is a retrospective review of patients treated with percutaneous Viabahn® stent-grafts for failing hemodialysis arteriovenous grafts (AVGs), between 6/2006 and 12/2009. All stent-grafts were deployed across the venous anastomosis to address the outflow obstruction. Patency and re-intervention rates were estimated using Kaplan-Meier analysis. Results Twenty patients had stent-grafts placed. Successful stent-grafting was defined as <30% residual stenosis and the ability to dialyze through the graft post-treatment. Technical success for stent-grafting was 100%. Median follow-up was 23 months (range 3 to 37 months). Stent-graft patency at 6 months: 94.7%, 12 months: 94.7%, 18 months: 82.1%, 24 months: 82.1%, 36 months: 82.1%. Freedom from re-intervention was 69% at 24 months and 50% at 36 months. Two AVGs failed and had to be removed without further interventions, because of complete occlusion and infection. Two patients (10%) required re-intervention for arterial inflow stenosis. One patient (5%) required balloon angioplasty and stenting of stenosis distal to the stent-graft. One patient (5%) developed in-stent stenosis and was treated with placement of a new stent. Graft salvage rate was 80% at 36 months. Conclusions Stent-grafts can be successfully used to improve freedom from re-intervention rates and overall patency rates of failing AVGs.