Approximately 10% of patients with subarachnoid hemorrhage die before receiving treatment. the morbidity and mortality rate within 30 days is approximately 25% or higher. The morbidity and mortality rate for rebleeding is approximately 50%, the rebleeding rate within 2 weeks is 20-25%, and the annual recurrence rate after 6 months is 2%-4%.
The most important factors affecting prognosis are the time interval after onset and the level of consciousness, with death and complications occurring mostly within 2 weeks of illness, and the morbidity and mortality rate at 6 months being 71% in comatose patients and 11% in awake patients. Other factors, such as older patients have a worse prognosis than younger patients; aneurysmal subarachnoid hemorrhage has a worse prognosis than non-aneurysmal subarachnoid hemorrhage.
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