Canadian CT Head Rule (Stiell 2001). CT is indicated if any high-risk factor (GCS <15 at 2 hours, suspected open or depressed skull fracture, any sign of basal skull fracture, vomiting 2 or more times, or age 65 or older) or any medium-risk factor (amnesia before impact >30 min, or dangerous mechanism as assigned by the caller). Not a diagnosis, not NEXUS, not PECARN, not CATCH, and not pediatric. magent does not examine the patient.

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