International Headache Society criteria for subarachnoid hemorrhage

What are the criteria from the International Headache Society for subarachnoid hemorrhage?

  • 1. Severe headache of sudden onset fulfilling criteria C and D
  • 2. Neuroimaging (CT or MRI T2 or flair sequences) or cerebrospinal fluid evidence of nontraumatic subarachnoid hemorrhage with or without other clinical signs
  • 3. Headache develops simultaneously with hemorrhage
  • 4. Headache resolves within 1 month

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