Recurrent stenosis ,usually located in the perianastomotic site,is the leading cause of native (AVF) failure. Surgery is considered the treatment of choice: usually a more proximal is created , but its drawback is the loss of vessel sites available for puncture. Therefore we deviced to replace the stenotic tract with ainterposition and prospectively evaluated AVF restenosis rate and blood flow as compared to AVF with the classical proximal neoanastomosis
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