What is the most common cause of an arteriovenous fistula?

What is the most common cause of an arteriovenous fistula?

• A. Developmental defect
• B. Traumatic injury
• C. Infection
• D. Atherosclerosis

Answer: (A)

An arteriovenous fistula is a direct connection between an artery and a vein that bypasses the capillary bed. The most common cause is a developmental defect—an abnormal persistence of primitive connections between arteries and veins during embryogenesis. Because the vascular system fails to separate properly early on, direct arteriovenous communications are established and persist as congenital fistulas. While traumatic injury, infection, or erosion from atherosclerotic processes can create AV fistulas later in life, these acquired causes are less frequent than congenital malformations overall.

An arteriovenous fistula is a direct connection between an artery and a vein that bypasses the capillary bed. The most common cause is a developmental defect—an abnormal persistence of primitive connections between arteries and veins during embryogenesis. Because the vascular system fails to separate properly early on, direct arteriovenous communications are established and persist as congenital fistulas. While traumatic injury, infection, or erosion from atherosclerotic processes can create AV fistulas later in life, these acquired causes are less frequent than congenital malformations overall.