844, 855, 866, 877, 888 and 800. No advantage to 8YY vs. using toll-free number as the latter is broad enough to include domestic toll-free services in other countries which number things differently. K7L (talk) 04:21, 31 October 2013 (UTC)
From Wikipedia, the free encyclopedia. The arteriovenous oxygen difference, or a-vO2 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.he usual unit for a-vO 2 diff is millilitres of oxygen per 100 millilitres of blood (mL/100 mL), however, particularly in medical uses, other units may be used, such as micro moles per millilitre (Î¼mol/mL).
Spinal = having to do with the spine. Arteriovenous = having to do with arteries and veins. Malformation = a congenital (present at birth) deformity. A spinal arteriovenous malformation (spinal AVM) is an abnormal tangle of blood vessels in the spinal cord. The two types of major blood vessels in the body are arteries and veins. Arteries carry oxygen-rich blood to the bodyâs tissues, and veins bring oxygen-depleted blood back to the heart and lungs. Arteries are usually under high pressure, since the blood inside these vessels has recently been pumped forcefully from the heart.