Health A-Z

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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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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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