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Emergency Medicine Orthopaedics Surgery

Canadian CT Head Rule

Last Updated on June 4, 2022

Head CT is required in minor head injury if patient has any of these signs:

High risk (for neurological intervention)

  1. Age ≥65 years
  2. GCS <15 at 2 hours after injury
  3. Suspected open or depressed skull fracture
  4. Any sign of basal skull fracture
  5. Vomiting ≥2 episodes

Medium risk (for brain injury on CT)

  1. Amnesia before impact >30 mins
  2. Dangerous mechanism

Exclusion Criteria

  • Non-trauma cases
  • GCS <13 on arrival
  • Age <16 years
  • Coumadin or bleeding disorder
  • Obvious open skull fracture

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