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Ottawa SAH Rule
Ottawa Subarachnoid Haemorrhage Rule for headache evaluation
Rule-out tool for subarachnoid haemorrhage in alert adults with acute headache. 6 features; any one present means SAH cannot be excluded.
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See this calculator worked on a real patient, then read the teaching around it.
- Subarachnoid haemorrhage10_011Worked example: Nisha Yadav, 55