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Sensitivity of proposed clinical decision rules for subarachnoid haemorrhage: An external validation study

Subarachnoid haemorrhage (SAH) is an uncommon but important cause of sudden‐onset headache. Three clinical decision rules (CDRs) for investigation in sudden headache have been proposed, but concerns were raised about the generalisability of some variables. Our aim was to determine what proportion of patients with confirmed SAH has the identified high‐risk factors and the sensitivity of the proposed CDR in an Australasian cohort.