An Arteriovenous (Av) Fistula Is An Abnormal Connection Between An Artery And A Vein. Normally, Blood Flows From Your Arteries To Your Capillaries To Your Veins. Nutrients And Oxygen In Your Blood Travel From Your Capillaries To Tissues In Your Body. With An Arteriovenous Fistula, Blood Flows Directly From An Artery Into A Vein, Bypassing Some Capillaries. When This Happens, Tissues Below The Bypassed Capillaries Receive A Diminished Blood Supply.

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