颅内动脉瘤破裂引起蛛网膜下腔出血可导致严重的颅内压升高,颅内压增高不仅发生在出血之初,也可持续几天。并表现其临床症状和颅内压升高相关。众所周知近20年来,以1克/公斤体重静脉点滴甘露醇,在给药10到15分钟内能使增高的颅内压降低60％。当颅内手术时,甘露醇常被利用降低颅高压,但是我们发现象以 Intracranial aneurysm rupture caused by subarachnoid hemorrhage can lead to severe intracranial pressure, increased intracranial pressure occurs not only in the beginning of bleeding, but also for a few days. And the performance of its clinical symptoms associated with increased intracranial pressure. It is well-known that mannitol intravenously administered at a dose of 1 g / kg over the last 20 years can result in a 60% decrease in increased intracranial pressure within 10 to 15 minutes of administration. When intracranial surgery, mannitol is often used to reduce intracranial hypertension, but we found it