本文以1984年美国神经外科医师协会年会资料为依据,主要对24年来颅内动脉瘤国际协作研究结果中有关动脉瘤和动静脉畸形的自然史(再出血的时间及发病率)作了总结,结果如下:首见破裂动脉瘤再出血的最高发病率是第一天,而不像过去人们所认为的第7天有一个出血高峰。也许这种早期的解释是由于过去人们对再出血和血管痉挛无法加以区别。第15天再出血的机会为30%。大约50%的病人在首次出血后40天至90天内情况稳定,大约3%的病人可持续稳定至15年。未破裂的动脉瘤有两种类型:一型是在某些其它疾病施行动脉造影时偶然发现;另一型见于合并1个动脉瘤破裂的多发性动脉瘤。两型的出血发病率为每年1%,这与不明原 Based on the 1984 annual meeting of the American Society of Neurosurgeons, this article summarizes the natural history of aneurysms and arteriovenous malformations (time and incidence of rebleeding) in the results of 24 years of international collaborative research on intracranial aneurysms The results were as follows: The highest incidence of rebleeding of the ruptured aneurysm was first on the first day, not as a peak on the seventh day in the past. Perhaps this early explanation was due to the inability of people to distinguish between rebleeding and vasospasm in the past. On the 15th, there is a 30% chance of bleeding again. Approximately 50% of patients are stable from 40 days to 90 days after the first hemorrhage and about 3% of patients are stable until 15 years. There are two types of unruptured aneurysms: one is accidentally discovered on arteriography in some other diseases; the other is in multiple aneurysms with ruptured aneurysm. Two types of bleeding rate of 1% per year, which is unknown