Definition: An abnormal direct communication between an artery and a vein without passing through the CAPILLARIES. An A-V fistula usually leads to the formation of a dilated sac-like connection, arteriovenous aneurysm. The locations and size of the shunts determine the degree of effects on the cardiovascular functions such as BLOOD PRESSURE and HEART RATE.
do not confuse with ARTERIOVENOUS ANASTOMOSIS, an anatomical term; coordinate IM with specific artery /abnorm + specific vein /abnorm (IM) or precoordinate vessel/disease headings (IM); Manual 23.19.6+; congenital cerebral arteriovenous fistula
See AlsoArteriovenous Malformations
