**Abstract**

Aneurysmal subarachnoid hemorrhage is an important group of intracranial hemorrhage with a high risk of disability and mortality. The initial amount of bleeding, rebleeding, and delayed cerebral ischemia are considered as the most important factors in determining the prognosis of aneurysm-induced bleeding. In arteriovenous malformations, its location and deep venous drainage play a role in the prognosis. Cardiac complications, neurogenic pulmonary edema, hypertension, hyperglycemia, infections, and prolonged mechanical ventilation in aneurysmal subarachnoid hemorrhage lead to morbidity and mortality. Aneurysm bleeding control, appropriate fluid replacement to ensure euvolemia, when necessary external ventricular drainage and/or decompressive craniectomy, mannitol or hypertonic saline application, and infection control are the main principles of treatment.

**Keywords:** aneurysmal subarachnoid hemorrhage,

cerebral arteriovenous malformation, cerebral vasospasm, delayed cerebral ischemia, intracranial pressure
