Head CT (Canadian Rule): Difference between revisions
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Comparison done to evaluate Sensitivity and Specificity for clinically important intracranial injuries | Comparison done to evaluate Sensitivity and Specificity for clinically important intracranial injuries | ||
===Sensitivity=== | ===Sensitivity=== | ||
Canadian 99% vs [[Head CT (New Orleans | Canadian 99% vs [[Head CT (New Orleans rule)|New Orleans]] 99% vs. Nexus II 97% | ||
===Specificity=== | ===Specificity=== | ||
Canadian 47% vs. New Orleans 33% vs. Nexus II 47% | Canadian 47% vs. New Orleans 33% vs. Nexus II 47% | ||
Revision as of 03:10, 20 April 2012
Canadian CT Head Rule
Not applicable for non-trauma, GCS<13, Age <16, Bleeding disorder or on anti-coagulation (e.g. Coumaidn, Debigatran), Obvious open skull fracture.
If ANY High Risk factor present – then get a CT Head
- Age >65 years
- Suspected Open or Depressed skull fracture
- Signs suggesting Basal skull fracture
- Hemotympanum
- Racoon eyes
- CSF otorrhea or rhinorrhea
- Battle sign
- Vomiting > 2 times
- GCS <15 at 2 hours post injury
If ANY Medium Risk factor present – then get a CT Head
- Amnesia before impact >30min
- Dangerous mechanism
- Pedestrian struck by vehicle
- Ejection from motor vehicle
- Fall from elevation >3 feet or 5 stairs
Canadian rule vs. New Orleans vs. Nexus II rules
Comparison done to evaluate Sensitivity and Specificity for clinically important intracranial injuries
Sensitivity
Canadian 99% vs New Orleans 99% vs. Nexus II 97%
Specificity
Canadian 47% vs. New Orleans 33% vs. Nexus II 47%
Source
- Ann of Emerg Med 2009; 53, 2:180-188.
- http://www.ohri.ca/emerg/cdr/cthead.html