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An arteriovenous (AV) fistula has proven to be the longest-lasting, safest way of gaining vascular access for dialysis. Normally, blood flows from arteries into capillaries and then into veins. When an arteriovenous fistula is present, blood flows directly from an artery into a vein, bypassing the capillaries. An arteriovenous fistula for kidney dialysis connects a … Arteriovenous (AV) fistula: facts for dialysis patients