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Free open access medical education from St Emlyn’s: clinical discussions, research appraisals, podcasts and reflections on learning and working in emergency care.

JC: Subarachnoid Haemorrhage, Decision Rules & Overtesting Headaches

11 min read

Can the Ottawa subarachnoid haemorrhage rule reduce unnecessary investigation without missing serious disease? This 2017 appraisal examines its prospective validation, patient selection and the tradeoff between sensitivity and specificity. Natalie May considers testing burden, clinician interpretation and why careful documentation of headache onset matters.

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