Clinical course of spontaneous subarachnoid hemorrhage: a population-based study in King County, Washington.

Over 2 years, we identified 171 patients in King County, Washington, experiencing an incident subarachnoid hemorrhage and characterized their clinical course and outcome. Most (65%) were women and most (68%) were under age sixty-five. Only five died without medical attention. The remaining 166 patients were hospitalized and had CTs of the head. Of these, 103 underwent aneurysm surgery, 40 developed acute hydrocephalus, 32 had symptomatic vasospasm, and 30 re-bled. Sixty-eight percent (68%) survived to 1 month after the bleed and 62% to 1 year. Independent predictors of good recovery by 1 month after the bleed included youth, a high score on the admission Glasgow Coma Scale, and absence of blood on the first CT. In this population-based series, at 1 month after the bleed, approximately one-third of patients were dead, one-third had neurologic deficits, and one-third were doing well.