What is artriovenous fistula?

plz urgent>>>>>>>> help me if U know anything about it only:)

sounds like a ruptured something

http://www.merck.com/mmhe/sec03/ch036/ch...

An arteriovenous fistula is an abnormal channel between an artery and a vein.

Normally, blood flows from arteries into capillaries and then into veins. When an arteriovenous fistula is present, blood flows directly from an artery into a vein, bypassing the capillaries. A person may be born with an arteriovenous fistula (congenital fistula), or a fistula may develop after birth (acquired fistula).

Congenital arteriovenous fistulas are uncommon. Acquired arteriovenous fistulas can be caused by any injury that damages an artery and a vein that lie side by side. Typically, the injury is a piercing wound, as from a knife or bullet. The fistula may appear immediately or may develop after a few hours. The area can swell quickly if blood escapes into the surrounding tissues.

Some medical treatments, such as kidney dialysis, require that a vein be pierced for each treatment. With repeated piercing, the vein becomes inflamed and clotting can develop. Eventually, scar tissue may develop and destroy the vein. To avoid this problem, doctors may deliberately create an arteriovenous fistula, usually between an adjoining vein and artery in the arm. This procedure widens the vein, making needle insertion easier and enabling the blood to flow faster. Faster flowing blood is less likely to clot. Unlike some large arteriovenous fistulas, these small, intentionally created fistulas do not lead to heart problems, and they can be closed when no longer needed.

http://www.merck.com/mmhe/sec03/ch036/ch...

The above link might help

Google it, the explanation is much to complicated.

Good Luck.

"An arteriovenous (AV) fistula is an abnormal passageway between an artery and a vein. Although it most often occurs in the legs or arms, an AV fistula can occur anywhere in the body, including the brain."

-Mayo Clinic website

Read more about it here:
http://www.mayoclinic.com/health/av-fist...
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An arteriovenous fistula is an abnormal connection or passageway between an artery and a vein. It may be congenital, surgically created for hemodialysis treatments, or acquired due to pathologic process, such as trauma or erosion of an arterial aneurysm.

Congenital fistulas, if small, usually do not need treatment. Acquired fistulas can be treated by surgery.

An arteriovenous fistula is an abnormal connection or passageway between an artery and a vein. This means that blood passes through the lungs without receiving enough oxygen.

Many patients have no symptoms. Some patients have difficulty breathing, shortness of breath with exertion, difficulty exercising, or bloody sputum. Other symptoms that may occur include blue skin (cyanosis), clubbing of the fingers (enlargement of the tips of the fingers), and a murmur heard with a stethoscope placed over the malformation.

A fistula is a leak or a hole between two parts of the body. Artriovenous suggests "artery" and "vein" and perhaps means that there is a leak between blood leaving the heart via the artery and blood returning to the heart via a vein. Type the words into a google search and you are bound to find out more. Please don't worry though - if a doctor has been able to diagnose that as the problem then they will know the best treatment and will no doubt be dealing with it appropriately.