Emergency Department Management for Stable MVA Patient with GCS 15
This patient requires a non-contrast head CT scan in the emergency department, despite having a GCS of 15 and stable vitals, because the mechanism of injury (high-energy rollover crash) places them at significant risk for occult intracranial injury. 1
Immediate CT Imaging is Indicated
The 2021 ACR Appropriateness Criteria and clinical guidelines universally recommend selective CT scanning based on mechanism and clinical features, not just GCS alone 1. Your patient meets high-risk criteria through:
- High-energy mechanism: Rollover crashes represent significant force transmission to the head, even without obvious external trauma
- Motor vehicle crash: One of the leading mechanisms for mild TBI requiring intervention 2
Critical pitfall: Up to 15% of patients with GCS 15 will have acute lesions on CT, and approximately 0.6% will require neurosurgical intervention 2, 3. Research from 2019 demonstrated that 10% of GCS 15 patients had gross CT abnormalities, with some requiring urgent craniotomy despite appearing completely normal initially 3.
Specific Clinical Assessment During ED Stay
While awaiting and after CT, document these high-risk features that predict need for intervention in GCS 15 patients 4:
- Any vomiting (present in 36% requiring urgent intervention)
- Severe headache (45% of urgent cases)
- Confusion or restlessness (64% and 36% respectively)
- Any GCS decline within first 6 hours (82% of urgent cases)
- Focal temporal impact (36% of urgent cases)
- Post-traumatic amnesia for the event
- Loss of consciousness at scene
Monitor continuously: Vital signs and perform hourly neurological checks with GCS documentation for at least 4-6 hours, as 73% of patients requiring urgent intervention showed GCS decline within 3 hours 4.
Additional Considerations
Check for antiplatelet or anticoagulant use immediately—these patients have significantly higher rates of ICU admission, neurosurgical intervention, and mortality even with GCS 15 3. If present, this further mandates CT imaging and extended observation.
Perform skull radiographs or ensure CT includes bone windows to evaluate for skull fractures—all five patients requiring intervention in one cohort had either skull fractures or neurologic deficits 5.
Disposition Algorithm
If CT shows intracranial injury: Admit for observation or neurosurgical consultation regardless of continued GCS 15 2
If CT is normal AND patient has:
- No skull fracture on imaging
- No neurologic deficit except amnesia
- No vomiting, severe headache, or confusion
- Stable GCS 15 for 4-6 hours observation
- No anticoagulation
- Reliable home situation with adult supervision
Then safe discharge is appropriate with strict return precautions 2, 5
Discharge instructions must include: Return immediately for vomiting, worsening headache, confusion, seizures, weakness, or drowsiness. Arrange follow-up within 24-48 hours as 5-15% may develop post-concussive symptoms requiring management 2, 6.
Do not discharge without CT imaging—the mechanism alone (rollover MVA) justifies imaging even in completely asymptomatic GCS 15 patients 1, 3.