蛛网膜下腔出血(Subarachnoid hemorrhage,SAH)是指多种原因致脑底部或脑表面的血管破裂后大量血液直接流入蛛网膜下腔,又称原发性蛛网膜下腔出血。蛛网膜下腔出血后再出血在临床上常见,其发生率为20%～40%。SAH患者90%存在头痛,部分患者在发病前数日或2周内有头痛、恶心、呕吐等“前兆渗漏”或称“警告性渗漏”的现象,但以单侧上睑下垂(后交通动脉瘤扩张压迫动眼神经致单侧动眼神经麻痹)为首发体征的蛛网膜下腔出血再发较为少见。蛛 Subarachnoid hemorrhage (SAH) refers to a variety of causes of blood vessels at the base of the brain or brain surface rupture a large number of blood directly into the subarachnoid space, also known as primary subarachnoid hemorrhage. Subarachnoid hemorrhage after bleeding in clinically common, the incidence was 20% to 40%. Some patients have headache in 90% of patients with SAH, and some patients have headache, nausea, vomiting, etc. “precursor leakage” or “warning leakage” within days or 2 weeks before onset, Palpitation (post-traffic artery aneurysm expansion oppression of the oculomotor nerve caused by unilateral oculomotor nerve paralysis) as the first sign of subarachnoid hemorrhage recurrence is rare. spider