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The Canadian CT Head Rule was developed to identify patients at high risk of requiring neurosurgical intervention and clinically important brain injury. It has been validated in patients > 16 years of age, with blunt head trauma. Exclusions to the rule include neurological deficits, bleeding disorders or oral anticoagulants, pregnancy, obvious open skull fractures, seizures or unstable major trauma patients.
A comparison between the New Orleans Criteria and the Canadian CT Head Rule was performed in 2005. It showed both had 100% sensitivities, but the Canadian CT Head Rule was more specific (50.6% vs 12.7%) and thus could result in fewer CT Scans.
References
Stiell et al. The Canadian CT Head Rule for patients with minor head injury. Lancet. 2001 May 5;357(9266):1391-6.
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Stiell et al. Comparison of the Canadian CT Head Rule and the New Orleans Criteria in Patients With Minor Head Injury. JAMA. 2005 Sep 28;294(12):1511-8.
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