Subarachnoid hemorrhage (SAH) is a neurological emergency because it may lead to sudden neurological decline and death and, depending on the cause, has treatment options that can return a patient to normal. Because there are interventions that can be life-saving in the first hour of onset, SAH was chosen as an Emergency Neurological Life Support protocol.
Keywords: Cerebral aneurysm; Fisher group; Hunt Hess; Hydrocephalus.