Interactive Canadian CT Head Rule calculator. Requires the calculator gadget.
Usage: {{Canadian CT Head Calculator}}
Canadian CT Head Rule
Canadian CT Head Rule
| High Risk (for neurosurgical intervention)
|
| Criteria
|
No
|
Yes
|
| GCS <15 at 2 hours after injury
|
1
|
|
| Suspected open or depressed skull fracture
|
1
|
|
| Any sign of basal skull fracture (hemotympanum, raccoon eyes, CSF otorrhea/rhinorrhea, Battle sign)
|
1
|
|
| Vomiting ≥2 episodes
|
1
|
|
| Age ≥65 years
|
1
|
|
| Medium Risk (for brain injury on CT)
|
| Amnesia before impact >30 min
|
1
|
|
| Dangerous mechanism (pedestrian struck, occupant ejected, fall from ≥3 feet or ≥5 stairs)
|
1
|
|
| High Risk Criteria
|
/ 5
|
| Medium Risk Criteria
|
/ 2
|
| Interpretation
|
| All No
|
CT NOT required — Low risk for clinically important brain injury. Safe for discharge with head injury instructions.
|
| Medium risk ≥1
|
CT recommended — Risk of brain injury on CT. Imaging indicated.
|
| High risk ≥1
|
CT required — High risk for neurosurgical intervention. Urgent CT head.
|
| References
|
- Stiell IG, Wells GA, Vandemheen K, et al. The Canadian CT Head Rule for patients with minor head injury. Lancet. 2001;357(9266):1391-1396. PMID 11356436.
- Stiell IG, Clement CM, Rowe BH, et al. Comparison of the Canadian CT Head Rule and the New Orleans Criteria in patients with minor head injury. JAMA. 2005;294(12):1511-1518. PMID 16189364.
- Inclusion criteria: GCS 13-15, age ≥16, injury within 24 hours, witnessed LOC/amnesia/disorientation.
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