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Table 1 Summary of study selection criteria

From: Efficacy and safety of secondary procedures for maintaining arteriovenous hemodialysis access patency: protocol for a systematic review and network meta-analysis

Study design
 Randomized controlled trials
 Quasi-randomized trials
 Age 18 years or older
 Stenosis of arteriovenous fistula or graft for hemodialysis
 Procedure on AV hemodialysis circuit stenosis
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
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
Outcome determination: immediate to 12 months