About 30% to 60% of people with an intracerebral hemorrhage die. In those who survive long enough to reach an emergency room, bleeding usually has stopped by the time they are seen by a doctor. Many people with ruptured aneurysms or subarachnoid hemorrhages also do not survive long enough to reach a hospital. Of those who do, about 50% die within the first month of treatment. However, in people with subarachnoid hemorrhages resulting from arteriovenous malformations, the risk of death is only about 15%.
Among the 25% of people who survive an intracerebral hemorrhage, many experience a major improvement in their symptoms as their bodies naturally and gradually reabsorb the clotted blood within the brain. Among those who survive a bleeding aneurysm, about 50% suffer long-term neurological problems. People who bleed from an aneurysm or AVM and do not have this problem treated are at risk for having a repeat bleeding event. If the blood vessel is not repaired or removed, one out of 5 survivors of subarachnoid hemorrhage have bleeding again within 14 days if the abnormal blood vessel was not repaired or removed. 50% who do not have surgical treatment have a repeat bleed within 6 months. When surgery is used to clip a bleeding aneurysm, there is a good chance of success, but there is also a 5% risk of death or long-term disability.
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