Emergency Department Approach to Traumatic Brain Injury
For mild TBI patients presenting to the ED, obtain a head CT based on validated clinical decision rules, and neurologically intact patients on anticoagulants or antiplatelet agents with a normal initial CT can be safely discharged without repeat imaging or prolonged observation 1.
Initial Assessment and Risk Stratification
Immediate Priorities
- Prevent secondary brain injury by addressing hypoxia, hypotension, and hypercarbia—these directly worsen outcomes 2
- Assess Glasgow Coma Scale (GCS) score to categorize severity:
- Mild TBI: GCS 13-15
- Severe TBI: GCS ≤8
Critical Clinical Factors to Document
- Loss of consciousness (LOC) duration and presence
- Amnesia (retrograde or anterograde)
- Mechanism of injury (high-risk mechanisms warrant lower threshold for imaging)
- Current anticoagulation or antiplatelet therapy
- Age (elderly patients ≥65 years have higher risk)
- Neurological examination findings, particularly any focal deficits
Imaging Decision-Making
When to Obtain Head CT
Use validated clinical decision rules for mild TBI patients. The decision to image should be systematic, not reflexive—head CT comprises approximately half of the 6.6-hour average ED length of stay for mTBI evaluation 3.
Special Populations Requiring CT
Anticoagulated/Antiplatelet Patients:
- Initial head CT is mandatory for any patient on anticoagulants (warfarin or NOACs) or antiplatelet agents with head trauma
- Single CT is sufficient—delayed intracranial hemorrhage (ICH) requiring neurosurgical intervention occurs in <1% of neurologically intact patients 1
- Exception: Elderly patients (≥65 years) on aspirin with high-risk features (LOC, amnesia, or GCS <15) may warrant observation if repeat CT is not performed, as delayed ICH rates approach 4% in this subgroup 1
Disposition Decisions
Safe Discharge Criteria for Mild TBI
Patients can be discharged if:
- Normal head CT (when indicated)
- Neurologically intact at baseline
- Reliable home supervision available
- Clear discharge instructions provided with return precautions
Critical caveat: Up to 5% of anticoagulated patients may develop delayed ICH, making discharge instructions and reliable supervision essential 1. Do not routinely withhold anticoagulation unless supratherapeutic levels suspected.
Admission Indications
- Any intracranial hemorrhage on CT
- Persistent neurological deficits
- GCS decline
- Lack of reliable home supervision (especially for patients requiring ongoing physical or cognitive assistance)
- Elderly patients on antiplatelet agents with high-risk features if repeat imaging declined
Severe TBI Management
If Patient Presents to Non-Neurosurgical Center
- Immediate transfer to Level I trauma center with neurosurgical capabilities is the standard of care 4, 2
- During stabilization and transfer:
- Secure airway if GCS ≤8 (intubation decision must be individualized based on transport time and provider expertise)
- Maintain systolic BP >90 mmHg
- Avoid hypercarbia and hypoxia
- Consider mannitol or hypertonic saline for signs of herniation
- Use ketamine with benzodiazepines for induction in hemodynamically unstable patients 2
Coagulopathy Management
- Point-of-care testing for trauma-induced coagulopathy
- Immediate reversal if ICH present
Common Pitfalls to Avoid
- Over-imaging low-risk mild TBI: Not every headache after minor trauma requires CT
- Routine repeat imaging in anticoagulated patients: The yield is extremely low (<1%) for actionable findings in neurologically intact patients 1
- Discharging patients without reliable supervision: This is particularly dangerous for elderly patients on antiplatelet agents
- Prehospital intubation without careful consideration: More difficult than in-hospital and should be weighed against transport time 2
- Allowing hypotension, hypoxia, or hypercarbia: These are modifiable factors that significantly worsen outcomes
Neurosurgical Consultation
Obtain immediate consultation for:
- Any traumatic ICH
- Depressed skull fractures
- Penetrating injuries
- Neurological deterioration