Management of Mild Traumatic Brain Injury in the Emergency Department

Primary Recommendation

• The American College of Emergency Physicians (ACEP) recommends that patients with isolated mild traumatic brain injury who have a negative head CT scan are at minimal risk for developing delayed intracranial lesions and may be safely discharged from the ED, with a Level B recommendation representing strong evidence that none of the patients with negative CT scans in multiple large prospective studies required subsequent neurosurgical intervention 1, 2, 3

Evidence Supporting Safe Discharge

• In a prospective study of 1,170 patients with mild TBI and negative CT who were admitted for 24-hour observation, none experienced neurologic deterioration, supporting the safety of discharge 1, 2
• A Class I randomized trial involving 39 hospitals and 1,292 mild TBI patients with negative CT scans found that none developed complications requiring hospital admission or surgery at 3-month follow-up, further supporting safe discharge 3, 2
• A comprehensive literature review of over 62,000 mild TBI patients with Glasgow Coma Scale score of 15 identified only 3 definite cases of early adverse outcomes within 2 days, indicating a low risk of adverse outcomes after discharge 3, 2

Critical Discharge Requirements

• The American College of Emergency Physicians (ACEP) does not support frequent waking or pupil assessment at home for patients with negative CT scans, as the evidence demonstrates that these patients are at extremely low risk for delayed deterioration 4
• Patients and caregivers must receive both written and verbal instructions to return immediately for symptoms such as memory problems, confusion, abnormal behavior, increased sleepiness or loss of consciousness 4, 1
• Discharge instructions must be written at a sixth- to seventh-grade reading level, provided in both print and verbal form, and use a type font no smaller than 12 points with wide margins and left justification 4

Postconcussive Symptom Education

• The American College of Emergency Physicians (ACEP) recommends that all discharged patients must receive education about postconcussive symptoms, including dizziness and balance problems, nausea, vision problems, sensitivity to noise and light, depression, mood swings, anxiety, irritability, and sleep disturbances, as a Level C recommendation 1, 2, 4

Important Caveats and Exceptions

• The evidence for safe discharge does not include patients with bleeding disorders, anticoagulation therapy, antiplatelet therapy, or previous neurosurgical procedures, and these populations may require individualized assessment and potentially admission or extended observation despite negative CT 1, 2
• For pediatric patients with mild TBI, clinical observation in the ED before deciding on CT imaging is an effective strategy that reduces unnecessary radiation exposure without increasing missed injuries, with every additional hour of ED observation associated with decreased CT utilization rates without delay in diagnosing significant TBI 5

Follow-Up Recommendations

• The American College of Emergency Physicians (ACEP) recommends providing injury prevention information about seatbelt, alcohol, and helmet safety, and considering referral to a TBI specialist for symptoms lasting beyond 3 weeks 4

CT Scan Guidelines for Mild Traumatic Brain Injury

Risk Assessment Based on Clinical Decision Rules

• The American College of Emergency Physicians (ACEP) guidelines recommend that patients with mild traumatic brain injury who have no high-risk factors do not require CT imaging 6
• The Canadian CT Head Rule and New Orleans Criteria suggest CT scanning only when specific risk factors are present, which this patient does not exhibit 6, 7
• The absence of vomiting, loss of consciousness, and seizures places this patient in a very low-risk category for clinically important brain injury 7, 8

Key Risk Factors That Would Warrant CT

• Loss of consciousness or amnesia is a key risk factor that would warrant CT imaging 6, 8
• Vomiting, especially more than once, is a risk factor that would necessitate CT scanning 6, 7
• Headache, particularly severe, is a risk factor that may require CT imaging 7, 8
• Age over 60 years increases the risk of intracranial injury and may lower the threshold for imaging 6, 8
• Drug or alcohol intoxication is a risk factor that would warrant CT imaging 7, 8
• Deficits in short-term memory, focal neurological deficit, and Glasgow Coma Scale (GCS) score less than 15 are all risk factors that would require CT scanning 6, 7, 8
• Signs of basilar skull fracture are a risk factor that would necessitate CT imaging 6

Special Considerations

• If the patient is on anticoagulant therapy, the threshold for CT imaging would be lower due to the higher risk of intracranial hemorrhage after head trauma 9
• If the patient is elderly (>60 years), the risk of intracranial injury increases, which might lower the threshold for imaging 8
• The mechanism of injury should be considered, but without other risk factors, this alone does not necessitate CT imaging 6

Monitoring and Follow-up

• Provide clear discharge instructions about warning signs that would necessitate return for evaluation, such as worsening headache, vomiting, confusion, or other neurological symptoms 6, 7
• Recommend appropriate follow-up if symptoms persist or worsen 7

Management of Mild Head Trauma in Adults

Immediate Assessment and Imaging

• The American College of Emergency Physicians (ACEP) recommends a non-contrast head CT scan for patients with mild head trauma who are 60 years or older, or have severe headache, as these are established risk factors for intracranial injury, with a Level B recommendation 10
• Patients with mild traumatic brain injury (TBI) who meet specific criteria, including age ≥60 years or severe headache, should undergo head CT imaging, according to the 2008 ACEP guidelines, with a strength of evidence of Level B 10

Clinical Decision-Making and Risk Factors

• The presence of difficulty with concentration or altered mental status, such as a "foggy sensation", warrants closer evaluation, as these may indicate possible cognitive impairment or other concerning features 10
• Anticoagulation therapy, such as warfarin or NOACs, or antiplatelet agents beyond aspirin, increases the risk of intracranial hemorrhage and should be inquired about specifically, with a risk of 3.9% versus 1.5% in non-anticoagulated patients 11

Cervical Spine Evaluation and Management

• The 2018 guidelines recommend cervical CT for moderate-to-severe TBI, but for patients with mild TBI and no neck pain, cervical imaging may be less urgent, with a recommendation for clinical vigilance 12, 13
• If midline cervical tenderness develops, cervical spine imaging should be obtained, according to the 2018 guidelines 13

Post-Imaging Management and Follow-up

• Patients with mild TBI and negative head CT can be safely discharged without admission or prolonged observation, with written and verbal return precautions and instructions, according to the guidelines 12, 14
• Neurosurgical consultation is required for lesions requiring intervention, and admission for observation is necessary if intracranial hemorrhage is present, with serial neurologic examinations and correction of systemic factors, such as maintaining mean arterial pressure ≥80 mmHg and avoiding hypoxemia (SaO2 <90%) 10, 12, 14

Imaging Recommendations for Elderly Patients on Warfarin After Ground‑Level Falls

Indications for Emergent Head CT

• Emergent non‑contrast head CT is mandatory for any head trauma in patients receiving therapeutic warfarin, even when they have no loss of consciousness, a normal Glasgow Coma Scale, or no visible injury. (American College of Emergency Physicians, 2023 ACEP clinical policy, Level A recommendation) 15
• Anticoagulation alone satisfies imaging criteria in clinical decision rules (e.g., Canadian CT Head Rule, New Orleans Criteria), independent of other risk factors. (ACEP, 2023) 15

Guideline Strength and Risk Stratification

• The 2023 ACEP clinical policy assigns a Level A (strong) recommendation that head CT be performed for trauma patients with coagulopathy, including therapeutic warfarin use. (ACEP) 15
• Anticoagulant therapy fundamentally alters risk stratification, overriding low‑risk features identified in other guidelines. (ACEP) 15

Timing of Imaging

• Head CT should be obtained immediately upon presentation; delayed imaging is not advised because anticoagulation can cause progressive intracranial bleeding over hours. (Journal of the American College of Radiology, 2019) 16

Limitations of Clinical Examination

• A normal neurologic exam at presentation does not reliably exclude intracranial injury in patients on warfarin. (ACEP, 2023) 15
• A Glasgow Coma Scale score of 15 does not rule out intracranial hemorrhage in anticoagulated individuals. (ACEP, 2023) 15