Pt received implantation of 2 venous window needle guides as part of a clinical trial on (b)(6) 2012.They were successfully used for hemodialysis.The pt experienced a drop in intra-access fistula flow that was noticed on (b)(6) 2014.She underwent a fistulogram on (b)(6) 2014.The fistulogram showed a 90% stenosis of the fistula right at the downstream end of the venous window needle guide as well as other stenoses closer to the arteriovenous anastamosis.The stenoses were treated with 8mm balloon angioplasty and the flow was improved.
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