1 For example, if you sell a product for $25, and it costs $20 to make, the gross profit margin is 20% ($5 divided by $25). 2  Net Profit Margin: This is often the equation used to determine an entire organizationâs profit margin.
Avascular necrosis (AVN), also called osteonecrosis, aseptic necrosis, or ischemic bone necrosis, is a condition that occurs when there is loss of blood to the bone. Because bone is living tissue that requires blood, an interruption to the blood supply causes bone to die. If not stopped, this process eventually causes the bone to collapse.
An arteriovenous malformation, or AVM, is an abnormal tangle of vessels in the brain or spinal cord in which one or more arteries are directly connected to one or more veins. Arteries carry blood from the heart to the tissues and veins take blood back from the tissues to the heart. In an AVM, the direct connection between one or more arteries and veins gives rise to many problems.