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Around 8% of patients presenting to the Emergency Department have a headache?
Around 25% of patients with a subarachnoid haemorrhage will die within the first 24 hours?
Atraumatic subarachnoid haemorrhage is due to an aneurysm in 20% of cases?
Perry found that a plain CT head within 6 hours of onset of headache, in neurologically normal patients, had a sensitivity of 100% for subarachnoid haemorrhage?