Abstract
In a population-based stroke incidence study, 27 cases of subarachnoid hemorrhage were identified, an incidence rate of 26.4/105 person yr at risk. Subarachnoid hemorrhage comprises but a small part of the burden of cerebrovascular disease, but all appear to be admitted to general hospitals. The overall survival rate was 44% to 6 mo.; in those cases treated surgically, the survival rate was 63%. By 6 mo., 19% were free of residual handicap; in terms of this endpoint, those cases treated surgically were at no advantage compared with those treated conservatively.