11 除了再出血外，動脈瘤破裂的病人最常出現嚴重後遺症及死亡的原因為：
(A)水腦（hydrocephalus）
(B)癲癇（seizure）
(C)血管攣縮（vasospasm)
(D)頭痛（headache）

Rebleeding — After aneurysmal SAH, the patient is at substantial risk of early rebleeding (4 to 14 percent in the first 24 hours, with maximal risk in the first 2 to 12 hours). Rerupture is associated with a high mortality. The mortality associated with rebleeding is reported to be as high as 70 percent.

Vasospasm and delayed cerebral ischemia — Delayed cerebral ischemia is a frequent complication of SAH; it contributes substantially to morbidity and mortality after SAH. Delayed cerebral ischemia occurs in approximately 30 percent of patients with aneurysmal SAH, typically between 4 and 14 days after symptom onset 

Seizures — Acute seizures occur in 6 to 18 percent of patients with SAH

Hydrocephalus — Hydrocephalus affects 20 to 30 percent of patients with SAH. It usually presents within the first few minutes to hours after SAH. Spontaneous improvement occurs in approximately 30 percent of patients with acute hydrocephalus and impaired consciousness, usually within 24 hours. In the remainder, acute hydrocephalus is associated with increased morbidity and mortality secondary to rebleeding and cerebral infarction