Venous distensibility is more important than venous diameter in primary survival of autogenous radiocephalic arteriovenous fistulas.

When cephalic veins with diameter ≤2 mm are found, venous distensibility should be used to aid in the surgery decision-making process. The outcome of wrist radio-cephalic arteriovenous fistula survival would be significantly improved through the use of cephalic vein with venous distensibility >0.52 mm.