Table 1 Summary of study selection criteria

Study design

 Randomized controlled trials

 Quasi-randomized trials

Participants

 Age 18 years or older

 Stenosis of arteriovenous fistula or graft for hemodialysis

 Procedure on AV hemodialysis circuit stenosis

Interventions

Performed on AV circuit (anastomosis to peripheral-central vein confluence)

Open or endovascular procedures, including the following:

Open surgical revision

Plain balloon angioplasty

Cutting balloon angioplasty

Drug-eluting balloon angioplasty

Drug-eluting stenting

Bare-metal stenting

Venous atherectomy

Covered stent grafting

Outcomes

Primary (essential): Primary AV circuit patency at 6 months

Secondary (optional):

Initial technical result

Functional success within 6 months

Lesion-specific primary patency at 6 months

Primary assisted AV circuit patency at 6 months

Cumulative (secondary) AV circuit patency at 6 months

Mortality at 6 and 12 months

Timing

Outcome determination: immediate to 12 months