Survivability of Brain Aneurysm
There is a real danger of not surviving a brain aneurysm that ruptures. An estimated 40 percent of people with a ruptured aneurysm die within 24 hours. Another 25 percent perish of complications within 6 six months. The outcome depends largely on the person’s health and age, the existence of other neurological problems, where the aneurysm is located, how much bleeding occurred and how soon medical treatment was provided.
Sometimes a subarachnoid hemorrhage (SAH) causes no or very little neurological damage. Other people endure permanent deficits, and possibly delayed complications such as hydrocephalus (fluid on the brain), and vasospasm (when a blood vessel becomes abnormally narrow), both of which can become life threatening.
The survivability of a brain aneurysm also depends to an extent on its size and location. A large aneurysm – greater or equal to 10 millimeters in diameter – poses a greater risk of rupture, as does a location in the back of the brain.