Aneurysmal Subarachnoid Hemorrhage A Population-Based Study

Background and Purpose: Population-based patient materials have not been used earlier in assessing the effects of neurosurgical treatment on survival and functional outcome of subarachnoid hemorrhage. Moreover, the proportion of all subarachnoid hemorrhage patients who might be candidates for neurosurgical treatment has not been estimated. Methods: We compared the survival and functional outcome of two population-based patient materials from Central Finland in 1976 through 1978 (n= 146) and 1980 through 1987 (n=351). The most important basic characteristics of both materials were similar. In the 1970s, only patients aged <60 years with carotid territory aneurysms were operated on after an interval of 2 weeks from the bleeding. In the 1980s, early surgery was attempted, and the other exclusion criteria were abandoned. Allocation to medical or surgical treatment was not randomized. Results: During the 1970s, only 14% of the patients had surgical treatment, with a median delay of 15 days after the bleeding; in the 1980s, the corresponding figures were 46% and 4 days. Despite these fundamental changes in the treatment policy, the survival up to 3 years in the 1980s was only marginally improved compared with the 1970s. Conversely, the functional outcome at 4 years after the bleeding was significantly better in the 1980s than the 1970s, with 82% and 64% of the survivors, respectively, being independent in the activities of daily living (P=.002). We estimated that 60% of all patients with subarachnoid hemorrhage might be candidates for neurosurgical treatment, provided that there are no delays in admission or evaluation. Conclusions: An active treatment policy of subarachnoid hemorrhage including early surgery only marginally improves survival, but the quality of life of the survivors is significantly better. Only 60%o of all patients in the population with subarachnoid hemorrhage can, at least theoretically, benefit from surgical treatment. (Stroke. 1993;24:1649-1654.)