Abandoning Further Study of the Application of Computed Tomography Decision Rules to Low-Risk Patients With Head Injury

I read with interest the article by Davey et al.1 The authors explain that despite the presumably low prevalence of intracranial hemorrhage, their "unique cultural practice" involves the performance of head computed tomography (CT) for patients with minimal head injury (head trauma without associated loss of consciousness or disorientation) for various reasons. Unsurprisingly, when Davey et al applied the Canadian CT Head Rule to their cohort, which was at lower risk than the population in which the rule was derived and validated, the rule identified all 5 positive CT results.

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