Endovascular treatment of vasospasm related to acute subarachnoid hemorrhage from ruptured aneurysms.

In the first 2 weeks after subarachnoid hemorrhage caused by a ruptured aneurysm, 30-35 % of surviving patients treated with conservative nonoperative therapy experience rebleeding. This is fatal in 60-90 % of cases and leads to significant disability in 17-20 % of cases. A major factor for this poor outcome is thought to be the vasospasm that occurs in up to 38.