Subarachnoid hemorrhage

In medicine a subarachnoid hemorrhage, is an intracranial hemorrhage that is "bleeding into the intracranial or spinal subarachnoid space, most resulting from intracranial aneurysm rupture. It can occur after traumatic injuries (subarachnoid hemorrhage, traumatic). clinical features include headache; nausea; vomiting, nuchal rigidity, variable neurological deficits and reduced mental status."

Diagnosis
A subarachnoid hemorrhage should be considered in patients in the emergency room with any of the following features:
 * age of 40 or more years
 * neck pain or stiffness
 * loss of consciousness
 * onset of headache with exertion
 * arrival by ambulance
 * vomiting
 * systolic blood pressure >160 mm Hg or diastolic blood pressure >100 mm Hg