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The arteriovenous oxygen difference, or a-vO 2 diff, is the difference in the oxygen content of the blood between the arterial blood and the venous blood. It is an indication of how much oxygen is removed from the blood in capillaries as the blood circulates in the body.
arteriovenous aneurysm. an abnormal communication between an artery and a vein in which the blood flows directly into a neighboring vein or is carried into the vein by a connecting sac. atherosclerotic aneurysm. one arising as a result of weakening of the tunica media in severe atherosclerosis.