Subarachnoid hemorrhage

Subarachnoid hemorrhage (SAH) is a type of hemorrhagic cerebrovascular disease, divided into two types: primary and secondary. Primary subarachnoid hemorrhage is caused by rupture and bleeding of blood vessels on the surface of the brain and the base of the brain, and blood flows directly into the subarachnoid space. Also called spontaneous SAH. Cerebral parenchyma or ventricular hemorrhage, traumatic subdural or epidural hemorrhage into the subarachnoid space are secondary SAH. Subarachnoid hemorrhage is one of the most common emergencies in neurology, with an incidence of 6% to 10% of acute cerebrovascular disease.