Emergency Neurological Life Support: Subarachnoid Hemorrhage.

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 few hours after onset, SAH was chosen as an Emergency Neurological Life Support (ENLS) protocol.