Since your kidney functions are deteriorating,dialysis becomes a must and AV fistula is being created for dialysis only.
An arteriovenous fistula
is an abnormal connection or passageway between an artery
and a vein. It is being surgically created for hemodialysis
Patients with end stage renal failure
are treated with hemodialysis. In dialysis, blood is withdrawn from an artery or vein, purified, and returned to a vein. The volume of blood is too great for veins to handle, so a vein must be enlarged. An artery and vein, usually in the arm above or below the elbow, are sewn together, to create a fistula, and arterial pressure eventually enlarges the vein. The enlarged vein can accommodate a cannula
or large needle.