To compare the access circuit primary patency after Ranger drug-coated balloon angioplasty of arteriovenous fistula (AVF) stenosis with that after conventional balloon angioplasty

This is a blinded randomized controlled trial recruiting 94 patients with AVF stenosis who will be randomized in a 1:1 ratio to either drug-coated balloon (Ranger) or conventional balloon. All peripheral AVF stenoses will be treated with the allocated balloon type.

The primary outcome measure is 6-month access circuit patency.

Inclusion Criteria:

1. Failing AVF with at least 1 AVF stenosis presenting with any clinical, physiological or haemodynamic abnormalities. Both de novo and recurrent stenosis are accepted.
2. AVF has been used successfully for at least 1 month (non-mature AVF are not allowed).
3. Less than 30% residual stenosis after angioplasty.
4. ≥ 21 years old
5. Informed and valid consent given.

Exclusion Criteria:

1. Thrombosed AVFs
2. Haemodynamically significant central vein stenosis
3. Target lesion not treatable with the available sizes of drug eluting balloon (up to 8mm)
4. Contraindication to antiplatelet therapy
5. Coagulopathy or thrombocytopenia that cannot be managed adequately with periprocedural transfusion.
6. Allergy / contraindication to paclitaxel.
7. Acute infection over proposed puncture site.
8. Women who are breastfeeding, pregnant * or planning on becoming pregnant during study.
9. Participant with medical conditions, which in the opinion of the investigator may cause noncompliance with protocol.
10. Currently participating in an investigational drug, biologic or device trial that may have an impact on the dialysis access or previous enrolment in this study.

All are blinded except procedurist and protocol administrator.