Arteriovenous malformations (AVM) are an abnormal tangle of blood vessel that connect arteries and veins and impair normal blood flow and oxygen delivery. Although they can arise anywhere in your body, they mostly happen in your brain and spinal cord. Blood carrying oxygen from the heart to the brain is carried via arteries. The oxygen-depleted blood is then returned to the heart and lungs through veins.
The surrounding tissues may not receive adequate oxygen when an AVM interferes with this crucial process. Additionally, the abnormally tangled blood arteries that make up the AVM are prone to being damage and rupture, due to the pressure brought by the force of the blood flow. If the AVM ruptures in the brain, it may result in bleeding within brain (hemorrhage), which results in a stroke, or permanent brain damage.
AVMs have an unknown cause. They are rarely passed down among families. Once identified, a brain AVM can frequently be successfully treated to prevent complication.
Symptoms of an AVM may vary depending on where it is located. The most common site of AVM is found in the brain, which could results in brain hemorrhage. As a result of the surrounding tissue being interfere by AVMs, neurologic symptoms such as the following occur:
Spinal cord AVM:
AVMs in other parts of the body: Depending on their size and the significance of the location, AVMs in other parts of the body (other than the brain and spine) may or may not cause symptoms. Typical general signs include:
Congenital AVM: Symptoms of one type of AVM known as a vein of Galen defect which is a defect deep in the brain, start to show up at or soon after birth. An example of a sign is:
If you have any of these symptoms, seek emergency medical attention immediately:
AVMs develop when arteries and veins develop abnormal connections, although researchers are unsure what cause it to happen. Though most types are typically not inherited, some genetic modifications might be involved.
The following increases the risk to develop AVM are:
+66 2066 8888