A Web-based Decision Tool to Estimate Subarachnoid Hemorrhage Risk in Emergency Department Patients.

Subarachnoid hemorrhage (SAH) from a leaking aneurysm is a neurological emergency. SAH patients often present with headache-a common chief complaint among emergency department patients. If unrecognized, 70% of the patients with re-bleeds die and one third are left with neurological deficits.