蛛网膜下腔出血的主要原因,是脑动脉瘤破裂所引起的,其他脑动静脉畸形及特发性出血等最多不过10%左右。这里将脑动脉瘤引起的蛛网膜下腔出血的手术适应证及时机叙述于下:一、决定脑动脉瘤手术预后的因素:1.患者术前状况(级)。主要是患者术前神经症状的轻重程度,即严重度的级别,在日本主要使用 Subarachnoid hemorrhage is the main reason for the ruptured cerebral aneurysm caused by other cerebral arteriovenous malformations and idiopathic bleeding, but up to about 10%. Here will be caused by brain aneurysm subarachnoid hemorrhage indications and timing of surgery described below: First, determine the prognosis of cerebral aneurysm surgery factors: 1. Preoperative patients (grade). Mainly the degree of severity of preoperative neurological symptoms, that is, the severity level, mainly used in Japan