Outcomes of Endovascular Treatment for Salvaging Failed Hemodialysis Arteriovenous Fistula - Role of Balloon Angioplasty as Initial Therapy.

Background: This study aims to evaluate the technical and clinical outcomes of endovascular treatment for failed native hemodialysis fistulas, mainly the role of balloon angioplasty in salvaging thrombosed and stenosed arteriovenous fistulas. Materials and Methods: This retrospective study was done on 23 patients who had presented with non-functioning dialysis fistulas. The mean age of the patients was 58.7 ± 2.3 years. The cause of failure was thrombosis in 14 cases (61%) and stenosis in 9 cases (39%). All patients initially underwent percutaneous transluminal angioplasty (PTA), followed by thromboaspiration depending on the thrombus load and extent. Results: A total of 27 salvage procedures were performed on 23 patients. Technical success was achieved in 24 procedures (88.8%), and clinical success was 81.5%. Patients were followed up for mean duration of 9.5 months (range: 1-19 months). Eight out of 23 accesses initially revised failed again due to repeat thrombosis, of which four patients underwent repeat procedures. The mean duration to re-intervention was 5.5 ± 1.3 months. The primary patency rates were 79% at 3 months and 60% at 6, 12, and 18 months. The cumulative (secondary) patency rates were 73% at 6 months and 66% at 12 and 18 months. Minor complications were seen in three procedures (11%), which included venous extravasation in two cases and prolonged bleeding from puncture site in one case. Conclusion: Percutaneous balloon angioplasty can be used as first-line procedure in failed hemodialysis fistulas, in both cases of stenosis and/or thrombosis, followed by thromboaspiration if required.