Ottawa Subarachnoid Hemorrhage (SAH) Rule for Headache Evaluation
This rule has very specific inclusion and exclusion criteria that must be followed closely for appropriate application:
Only apply in: Alert patients ≥15 years old, new severe atraumatic headache, maximum intensity within 1 hour.
Do not use in: Patients with new neurologic deficits, prior aneurysm, prior SAH, known brain tumors, or chronic recurrent headaches (≥3 headaches of the same character and intensity for >6 months).
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