Traumatic Brain Injury — Part 5: Concussion, Special Populations & Prognosis
Concussion assessment (SCAT6), return-to-play and return-to-learn protocols, post-concussive syndrome, pediatric TBI, geriatric TBI, TBI in pregnancy, IMPACT and CRASH prognostic models, biomarkers (GFAP, UCH-L1, S100B, NSE), and rehabilitation referral criteria.
1. Concussion / Mild Traumatic Brain Injury
1.1 Definition
Concussion is defined as a traumatic brain injury induced by biomechanical forces, resulting in a complex pathophysiological process affecting the brain. The 6th International Consensus Conference on Concussion in Sport (Amsterdam, 2022) provides the current consensus definition.1
| Feature | Detail |
|---|---|
| Mechanism | Direct blow to the head, face, neck, or body with an impulsive force transmitted to the head |
| Clinical features | Rapid onset of short-lived neurological impairment that typically resolves spontaneously |
| Neuropathological changes | Functional disturbance (neurometabolic cascade) rather than structural injury; standard neuroimaging (CT, routine MRI) is typically normal |
| Graded set of symptoms | May or may not involve loss of consciousness; LOC occurs in < 10% of sport concussions |
| Resolution | Symptoms typically resolve within 10–14 days in adults and 4 weeks in children; prolonged symptoms in some patients |
1.2 Concussion Assessment — SCAT6
The Sport Concussion Assessment Tool, 6th Edition (SCAT6) is the standardized concussion assessment tool endorsed by the international consensus group. It replaces the SCAT5 and is designed for use by healthcare professionals. A separate Child-SCAT6 exists for children aged 5–12 years.1 2
SCAT6 Components
| Component | Description |
|---|---|
| 1. Immediate assessment (on-field) | Red flag assessment → observable signs → memory assessment (Maddocks questions) → GCS → cervical spine assessment |
| 2. Office/ED assessment | Athlete background → symptom evaluation → cognitive screening → neurological screening → balance examination → delayed recall → clinical decision |
Maddocks Questions (Sideline Assessment)
| Question |
|---|
| “What venue are we at today?” |
| “Which half is it now?” |
| “Who scored last in this match?” |
| “What team did you play last week/game?” |
| “Did your team win the last game?” |
Failure to correctly answer these questions in context of an observed mechanism suggests concussion. The Maddocks questions are more sensitive than orientation questions (person, place, time) for detecting sport-related concussion.
SCAT6 Symptom Checklist (22 Symptoms)
The patient rates each symptom on a severity scale from 0 (none) to 6 (severe). Total possible symptom score: 0–132.
| Symptom | Symptom (continued) |
|---|---|
| Headache | Difficulty concentrating |
| “Pressure in head” | Difficulty remembering |
| Neck pain | Fatigue or low energy |
| Nausea or vomiting | Confusion |
| Dizziness | Drowsiness |
| Blurred vision | More emotional |
| Balance problems | Irritability |
| Sensitivity to light | Sadness |
| Sensitivity to noise | Nervous or anxious |
| Feeling slowed down | Trouble falling asleep |
| Feeling “in a fog” | Sleeping more than usual |
SCAT6 Cognitive Assessment — Standardized Assessment of Concussion (SAC)
| Domain | Test | Maximum Score |
|---|---|---|
| Orientation | Month, date, day of week, year, time (± 1 hour) | 5 |
| Immediate memory | 5-word list × 3 trials (10-word list available) | 15 (or 30 for 10-word) |
| Concentration | Digits backward (3-digit, 4-digit, 5-digit, 6-digit); months in reverse order | 5 |
| Delayed recall | Recall the 5-word (or 10-word) list after balance exam | 5 (or 10) |
SCAT6 Balance Examination — Modified BESS
| Stance | Surface | Duration |
|---|---|---|
| Double-leg stance | Firm surface | 20 sec |
| Single-leg stance (non-dominant foot) | Firm surface | 20 sec |
| Tandem stance (non-dominant foot behind) | Firm surface | 20 sec |
Errors (hands lifted off iliac crests, eyes opened, stumbling, moving out of position, lifting forefoot/heel, remaining out of position > 5 sec) are counted. Maximum 10 errors per stance.
1.3 Diagnosis of Concussion
| Principle | Detail |
|---|---|
| No single test | Concussion is a clinical diagnosis based on the totality of information: mechanism, symptoms, cognitive testing, neurological examination, and balance assessment |
| CT indication | Only if clinical decision rules indicate (Canadian CT Head Rule, PECARN); CT is NOT routinely indicated for suspected sport concussion with GCS 15 and no risk factors |
| MRI | Not routinely indicated acutely; may be considered if symptoms persist > 4 weeks or are atypical |
| Blood biomarkers | See Section 6 (Biomarkers); GFAP/UCH-L1 may help rule out intracranial hemorrhage in mTBI |
| Neuropsychological testing | Baseline testing (e.g., ImPACT) may aid in return-to-play decisions but is not required for diagnosis |
1.4 Acute Concussion Management
| Recommendation | Detail |
|---|---|
| Physical and cognitive rest | Initial 24–48 hours of relative rest (not complete bed rest). Avoid activities that significantly worsen symptoms |
| Early sub-symptom-threshold exercise | After 24–48 hours, gradually introduce light aerobic exercise that does not provoke symptoms. The Buffalo Concussion Treadmill Test can guide exercise prescription3 |
| Education | Reassure patient that most concussions resolve within 10–14 days; provide written discharge instructions |
| Medications | Acetaminophen for headache. Avoid NSAIDs in the first 48 hours (theoretical bleeding risk, though no strong evidence). Avoid opioids and sedating medications |
| Screen time | Allow gradual reintroduction; complete avoidance is not recommended |
| Driving | Avoid until asymptomatic and cognitively cleared |
| No same-day return to sport | An athlete diagnosed with concussion should NOT return to sport on the same day of injury (consensus recommendation)1 |
2. Return-to-Play (RTP) Protocol
The graduated return-to-sport (RTS) protocol consists of 6 stepwise stages, each lasting a minimum of 24 hours. If symptoms recur at any stage, the athlete returns to the previous asymptomatic stage and rests for at least 24 hours before reattempting.1
2.1 RTS Stepwise Protocol
| Stage | Goal | Activity | Minimum Duration |
|---|---|---|---|
| 1 | Symptom-limited activity | Daily activities that do not provoke symptoms (e.g., walking, light household tasks) | 24 hours |
| 2 | Light aerobic exercise | Walking, swimming, or stationary cycling at < 70% max heart rate. No resistance training | 24 hours |
| 3 | Sport-specific exercise | Running drills, skating drills (sport-specific). No head-impact activities | 24 hours |
| 4 | Non-contact training drills | More complex training drills (e.g., passing drills). May add progressive resistance training | 24 hours |
| 5 | Full-contact practice | Normal training activities after medical clearance | 24 hours |
| 6 | Return to competition | Full unrestricted competition | — |
Key Principles:
- Minimum total time: 6 days from start of RTS protocol to return to competition (one day per stage)
- Medical clearance required: Before advancing from Stage 4 to Stage 5 (full-contact practice), the athlete must be cleared by a physician or licensed healthcare provider
- Pediatric modification: Children and adolescents may require longer at each stage; a minimum of 48 hours per stage is recommended by some experts, with total minimum of 14 days
- If symptoms recur: Return to last asymptomatic stage, rest ≥ 24 hours, then reattempt progression
2.2 Return-to-Play Decision Considerations
| Factor | Implication |
|---|---|
| Age | Younger athletes (< 18 years) typically take longer to recover and should follow a more conservative timeline |
| History of prior concussions | Athletes with multiple prior concussions are at higher risk for prolonged recovery and recurrent concussion |
| Symptom duration | Athletes who are still symptomatic should NOT return to contact sport |
| Cognitive testing | If baseline neuropsychological testing was performed, return to baseline performance supports readiness |
| Balance | Return to normal balance on clinical testing |
| Comorbidities | Depression, anxiety, migraine history, ADHD, and sleep disorders can prolong recovery |
3. Return-to-Learn (RTL) Protocol
Academic accommodations are critical for students recovering from concussion. Cognitive exertion (studying, reading, screen time, standardized testing) can exacerbate symptoms and should be gradually reintroduced.1 4
3.1 RTL Stepwise Protocol
| Stage | Goal | Activities |
|---|---|---|
| 1 | Daily activities at home | Reading, limited screen time, light cognitive activity that does not significantly worsen symptoms |
| 2 | School activities (part-day) | Reduced workload: partial school attendance, extra breaks, reduced homework, no exams |
| 3 | School activities (full day, with accommodations) | Full attendance with accommodations: extended time for tests, reduced homework, breaks as needed, preferential seating |
| 4 | Full return to academics | Normal academic workload, no accommodations needed |
Academic Accommodations During Recovery:
| Accommodation |
|---|
| Extended time for tests and assignments |
| Reduced homework volume |
| Rest breaks (quiet room available) |
| Preferential seating (away from windows, fluorescent lights, noise) |
| Postponement of standardized testing |
| Permission to wear sunglasses indoors if photosensitive |
| Excusal from physical education |
| Access to recorded lectures or peer note-takers |
Key Point: Return-to-learn should PRECEDE return-to-sport. The academic priority reflects the recognition that a student’s primary role is educational, and cognitive recovery should be established before reintroduction of physical risk.4
4. Post-Concussive Syndrome (Persistent Post-Concussion Symptoms)
4.1 Definition
Post-concussive syndrome (PCS) refers to the persistence of concussion symptoms beyond the expected recovery period (> 10–14 days in adults; > 4 weeks in children). Approximately 10–30% of concussion patients develop persistent symptoms.5
4.2 Risk Factors for Prolonged Recovery
| Risk Factor | Detail |
|---|---|
| Female sex | Higher rates of persistent symptoms, possibly related to hormonal factors and neck biomechanics |
| History of prior concussions | Dose-dependent increase in risk |
| History of migraine | Strong predictor of persistent headache after concussion |
| History of depression, anxiety | Pre-existing mental health conditions predict prolonged recovery |
| ADHD or learning disability | May affect cognitive recovery |
| Higher initial symptom burden | Patients with many/severe initial symptoms take longer to recover |
| Delayed presentation (> 7 days to medical care) | Associated with prolonged symptoms |
| Age (adolescents) | Children and adolescents tend to take longer than adults |
| Early post-traumatic migraine | Migraine-type headache within 72 hours is a strong predictor |
| Complete rest beyond 48 hours | Prolonged physical and cognitive rest is associated with WORSE outcomes |
4.3 Symptoms
| Symptom Domain | Examples |
|---|---|
| Physical | Headache (most common), dizziness, nausea, fatigue, photosensitivity, phonosensitivity, sleep disturbance |
| Cognitive | Difficulty concentrating, memory impairment, processing speed deficits, “brain fog” |
| Emotional | Irritability, sadness, anxiety, emotional lability |
| Sleep | Insomnia, hypersomnia, disrupted sleep-wake cycle |
| Vestibular | Dizziness with head movement, motion sensitivity, imbalance |
| Ocular | Convergence insufficiency, accommodation dysfunction, saccadic/smooth pursuit abnormalities |
4.4 Management of Persistent Post-Concussion Symptoms
| Domain | Treatment |
|---|---|
| Sub-symptom threshold aerobic exercise | Structured aerobic exercise program (Buffalo Concussion Treadmill Test to determine threshold); strongest evidence for improving persistent symptoms3 |
| Vestibular rehabilitation | For patients with dizziness, imbalance, motion sensitivity. Vestibular physical therapy with habituation and gaze stabilization exercises |
| Vision therapy | For convergence insufficiency or accommodation disorders. Neuro-optometric assessment and exercises |
| Cervical spine physiotherapy | Cervicogenic headache and dizziness are common after concussion. Manual therapy, cervical exercises |
| Cognitive behavioral therapy (CBT) | For anxiety, depression, catastrophizing. Evidence supports benefit for persistent symptoms |
| Headache management | Amitriptyline 10–25 mg nightly, nortriptyline 10–25 mg nightly, or topiramate 25–50 mg BID for post-traumatic migraine. Avoid medication overuse headache from analgesics |
| Sleep hygiene | Sleep optimization; melatonin 3–5 mg at bedtime; trazodone 25–50 mg for persistent insomnia |
| Neuropsychological rehabilitation | Cognitive strategies, compensatory techniques, gradual cognitive load increase |
| Multidisciplinary concussion clinic | Ideal for patients with persistent symptoms > 4 weeks; coordinated care by sports medicine, neuropsychology, vestibular PT, and neuro-optometry |
5. Pediatric TBI — Special Considerations
5.1 Epidemiological Differences
TBI is the leading cause of death and disability in children. Key differences from adult TBI include.6 7
| Feature | Pediatric Consideration |
|---|---|
| Leading mechanisms | Falls (leading cause in children < 4); motor vehicle crashes (leading cause in adolescents); sports (leading cause of concussion); non-accidental trauma (see below) |
| Skull and brain differences | Thinner skull, more pliable (less likely to fracture, but higher risk of underlying injury); higher brain water content; unmyelinated axons more vulnerable to shear; open fontanelles in infants may mask early ICP elevation |
| Growing skull fracture | Unique to children < 3 years; linear fracture may enlarge over time due to dural tear and leptomeningeal herniation |
| Diffuse cerebral edema | More common and more severe in children than adults; “malignant cerebral edema” can develop rapidly |
| Concussion recovery | Generally longer than adults; minimum 2–4 week recovery expected; conservative return-to-sport approach |
5.2 Non-Accidental Trauma (Child Abuse) — Abusive Head Trauma
Screening for abusive head trauma (AHT) is mandatory in all young children with TBI, particularly when the mechanism is inconsistent with the developmental stage of the child.8
| Red Flag | Detail |
|---|---|
| Mechanism inconsistent with injury | e.g., “short fall” producing SDH, severe retinal hemorrhages, or complex skull fractures |
| Age < 1 year with SDH | Subdural hematoma in non-mobile infants should raise high suspicion |
| Retinal hemorrhages | Present in ~85% of AHT; multilayered, too numerous to count retinal hemorrhages are highly specific for AHT |
| SDH of varying ages | Suggests repeated episodes of trauma |
| Additional injuries | Rib fractures (especially posterior), long bone fractures (especially metaphyseal corner fractures), bruising in non-ambulatory children |
| Delayed presentation | Caregiver brings child to medical attention well after the injury event |
| Changing or inconsistent history | Different story from different caregivers or story that changes over time |
Required Workup for Suspected AHT:
| Test |
|---|
| Skeletal survey (AP views of all long bones, AP and lateral skull, AP and lateral spine, AP chest including oblique rib views, AP pelvis) |
| Repeat skeletal survey in 2 weeks (to detect healing fractures not visible acutely) |
| Dilated fundoscopic examination by ophthalmology |
| CT head without contrast |
| MRI brain (when stable; adds information about injury timing and DAI) |
| Coagulation studies (PT, PTT, fibrinogen, von Willebrand panel) to exclude bleeding diathesis |
| Hepatic transaminases and lipase (to screen for occult abdominal injury) |
| Urinalysis (to screen for renal injury) |
| Report to child protective services (CPS) — mandatory in all US states for suspected abuse |
5.3 Pediatric ICP and CPP Targets
| Parameter | Pediatric Target | Notes |
|---|---|---|
| ICP threshold | Treat ICP > 20 mmHg | Some guidelines use lower thresholds for younger children |
| CPP target | 40–50 mmHg (age 0–5 years); 50–60 mmHg (age 6–17 years) | Lower than adult targets due to lower baseline MAP |
| Minimum SBP | Age-appropriate: 70 + (2 × age in years) for children > 1 year; ≥ 60 for infants | Avoid hypotension aggressively |
5.4 Pediatric Decompressive Craniectomy
Evidence for decompressive craniectomy in children with refractory ICP comes primarily from retrospective studies and case series. Outcomes may be more favorable in children than adults, likely reflecting greater neuroplasticity.9
6. Geriatric TBI — Special Considerations
6.1 Epidemiology
TBI in adults ≥ 65 years is a growing public health concern, with falls representing the dominant mechanism. Geriatric TBI carries higher mortality and poorer functional outcomes compared to younger adults with equivalent injury severity.10
| Feature | Geriatric Consideration |
|---|---|
| Leading mechanism | Ground-level falls (> 60% of geriatric TBI) |
| Anticoagulant/antiplatelet use | Up to 30–40% of geriatric TBI patients are on antithrombotic therapy, substantially increasing the risk and severity of intracranial hemorrhage |
| Brain atrophy | Increased subdural space places bridging veins on greater stretch → higher risk of SDH even with trivial mechanisms |
| Blunted GCS | Baseline cognitive impairment, hearing loss, and aphasia may confound GCS assessment |
| Comorbidities | Hypertension, diabetes, cardiac disease affect physiologic reserve and tolerance for surgery |
6.2 Anticoagulant-Associated Intracranial Hemorrhage
This represents the single most dangerous intersection in geriatric TBI. The management principles include.11
| Recommendation | Detail |
|---|---|
| Low threshold for CT | ANY head injury in an anticoagulated patient warrants CT, regardless of symptoms or GCS. The Canadian CT Head Rule specifically excludes anticoagulated patients (they should all get CT) |
| Immediate reversal | See Part 2 for detailed reversal protocols (PCC for warfarin; idarucizumab for dabigatran; andexanet alfa or PCC for factor Xa inhibitors) |
| Repeat CT | Recommended at 6–24 hours even if initial CT is normal, given risk of delayed hemorrhage (especially with warfarin — delayed ICH occurs in 0.6–6% of initially CT-negative anticoagulated patients) |
| Target INR | ≤ 1.4 within 60 minutes for warfarin-associated ICH |
| Anticoagulant restart timing | Complex decision involving neurosurgery, neurology, and the prescribing specialty. Generally 7–14 days for high-risk patients (mechanical heart valves, recent PE); 4–8 weeks for lower-risk indications (atrial fibrillation). Individual risk-benefit analysis required |
6.3 Lower Threshold for Intervention
| Consideration | Detail |
|---|---|
| GCS may underestimate severity | Elderly patients may have lower baseline GCS due to dementia, hearing loss; consider imaging even at GCS 15 if mechanism or risk factors present |
| “Talk and die” phenomenon | More common in elderly; patients initially appear well but deteriorate. Serial neurologic exams are essential |
| Goals of care | Advance directive status should be established early. Prognosis is significantly worse in elderly TBI, and family discussions regarding goals of care should occur promptly |
7. TBI in Pregnancy
| Consideration | Detail |
|---|---|
| Imaging | CT head is acceptable and should NOT be delayed for pregnant patients with TBI indication. The radiation dose to the fetus from a head CT is negligible (< 0.001 mGy to the uterus) |
| Fetal monitoring | Continuous fetal monitoring from viability (23–24 weeks) onward; obstetric consultation |
| Rh status | Determine Rh status; administer RhoGAM (anti-D immunoglobulin) 300 mcg IM to Rh-negative mothers with abdominal trauma |
| Medications | Levetiracetam is preferred for seizure prophylaxis (Category C, but better safety profile than phenytoin in pregnancy). Mannitol may cause fetal dehydration — use with caution; hypertonic saline may be preferred |
| Positioning | Left lateral decubitus position or left uterine displacement for patients > 20 weeks gestation to prevent aortocaval compression |
| Blood pressure targets | Same as non-pregnant patients for TBI; obstetric considerations for preeclampsia management if applicable |
8. Prognostic Models and Biomarkers
8.1 IMPACT Prognostic Model
The International Mission for Prognosis and Analysis of Clinical Trials in TBI (IMPACT) model provides individualized outcome prediction for moderate-to-severe TBI.12
| Model Level | Variables Included |
|---|---|
| Core | Age, GCS motor score, pupillary reactivity |
| Extended | Core + CT classification (Marshall), presence of tSAH, presence of EDH |
| Lab | Extended + glucose, hemoglobin |
Outcome: Predicts 6-month mortality and 6-month unfavorable outcome (GOS-E 1–4)
Access: Online calculator available at https://www.tbi-impact.org/
8.2 CRASH Prognostic Model
The Corticosteroid Randomisation After Significant Head Injury (CRASH) prognostic model was derived from the CRASH trial cohort (10,008 patients).13
| Variable | Included in Model |
|---|---|
| Age | Yes |
| GCS | Yes (total score) |
| Pupillary reactivity | Yes |
| Presence of major extracranial injury | Yes |
| CT findings | Yes (petechial hemorrhage, obliteration of basal cisterns, SAH, midline shift, non-evacuated hematoma) |
| Country income level | Yes (high-income vs. low/middle-income) |
Outcome: Predicts 14-day mortality and 6-month unfavorable outcome
Access: Online calculator available at https://www.crash.lshtm.ac.uk/
8.3 Comparison of Prognostic Models
| Feature | IMPACT | CRASH |
|---|---|---|
| Derivation cohort | Pooled RCT data (8,509 patients from 11 studies) | CRASH trial data (10,008 patients) |
| Population | Moderate-to-severe TBI (GCS 3–12) | Moderate-to-severe TBI (GCS ≤ 14 within 8 hours) |
| Uses GCS motor score | Yes (most discriminatory GCS component) | No (uses total GCS) |
| Includes lab values | Yes (glucose, hemoglobin) | No |
| External validation | Extensively validated; good discrimination (AUC 0.78–0.89) | Extensively validated; good discrimination (AUC 0.80–0.87) |
| Limitation | May underperform in isolated populations | Includes country income level, which may not be applicable in all settings |
Clinical Pearl: Both IMPACT and CRASH models should be used to inform prognosis, not to determine treatment. No prognostic model should be used in isolation to withhold treatment, particularly in the early period after TBI when the clinical trajectory is uncertain.12
8.4 Blood Biomarkers in TBI
| Biomarker | Source | Clinical Utility | Status |
|---|---|---|---|
| GFAP (glial fibrillary acidic protein) | Astrocytes | Elevated within hours of injury; correlates with CT abnormalities; used in the Banyan BTI (Brain Trauma Indicator) FDA-cleared test to rule out intracranial hemorrhage in mild TBI (GCS 13–15) within 12 hours of injury14 | FDA-cleared (i-STAT TBI Plasma test); clinical use expanding |
| UCH-L1 (ubiquitin C-terminal hydrolase L1) | Neurons | Elevated within hours; combined with GFAP in the Banyan BTI test; negative predictive value > 99% for CT-positive lesions in mTBI | FDA-cleared (paired with GFAP) |
| S100B | Astrocytes, Schwann cells, other non-neural sources | Elevated after TBI; used in Scandinavian guidelines to reduce CT use in mild TBI (negative S100B within 6 hours → CT not needed); limited by non-neural sources (elevated by extracranial injury, fractures)15 | Clinical use in Europe; not FDA-cleared for TBI in the US |
| NSE (neuron-specific enolase) | Neurons, red blood cells | Prognostic marker in severe TBI; limited by hemolysis artifact (falsely elevated if blood sample is hemolyzed) | Research and prognostic use |
| Neurofilament light (NfL) | Axons | Marker of axonal injury; peaks later than GFAP/UCH-L1 (days rather than hours); correlates with DAI severity and long-term outcome | Research; not yet FDA-cleared |
| Tau | Axons, neurons | Elevated after concussion and severe TBI; correlates with chronic traumatic encephalopathy (CTE) in research settings | Research |
FDA-Cleared Blood Biomarker Test for mTBI (Banyan BTI / i-STAT TBI Plasma):
| Parameter | Detail |
|---|---|
| Analytes | GFAP + UCH-L1 (combined) |
| Indication | Adults with suspected mTBI (GCS 13–15) within 12 hours of injury to aid in determination of need for CT |
| Interpretation | Negative result: low likelihood of CT-positive intracranial lesion (NPV > 99.6%); CT may be safely deferred in appropriate clinical context |
| Positive result | Does NOT confirm intracranial lesion; CT is still needed |
| Limitations | Not validated for pediatric patients, GCS < 13, or injury > 12 hours; should not replace clinical judgment |
| FDA clearance | 2018 (original); 2021 (i-STAT point-of-care platform) |
9. Chronic Traumatic Encephalopathy (CTE) — Emerging Considerations
| Feature | Detail |
|---|---|
| Definition | Progressive neurodegenerative disease associated with repetitive head impacts; characterized by perivascular accumulation of hyperphosphorylated tau at the depths of cortical sulci |
| Risk population | Contact sport athletes (football, boxing, ice hockey, rugby, soccer), military personnel with blast exposure |
| Diagnosis | Currently can only be definitively diagnosed post-mortem by neuropathological examination. No validated in-vivo diagnostic biomarker or imaging modality yet (PET tau tracers under investigation) |
| Clinical features | Behavior/mood changes (aggression, depression, suicidality), cognitive impairment, executive dysfunction, later dementia |
| Stages | Stage I–IV based on extent of tau pathology (McKee classification) |
| Relationship to TBI management | Emphasizes the importance of proper concussion management, return-to-play protocols, and recognition that repetitive subconcussive impacts may also contribute to CTE risk |
| Medicolegal significance | Increasingly recognized in forensic and legal settings; clinicians should document all concussion history |
10. Rehabilitation After TBI
10.1 Rehabilitation Referral Criteria
Early referral to rehabilitation services is associated with improved functional outcomes across all TBI severity levels.16
| Severity | Rehabilitation Recommendation |
|---|---|
| Severe TBI (GCS 3–8) | Inpatient rehabilitation as soon as medically stable (typically when ICP is controlled and patient is following commands or emerging from coma). A dedicated brain injury rehabilitation unit is preferred |
| Moderate TBI (GCS 9–12) | Inpatient rehabilitation if functional deficits preclude safe discharge home; outpatient rehabilitation if able to return home with support |
| Mild TBI with persistent symptoms | Outpatient multidisciplinary concussion clinic (sports medicine, neuropsychology, vestibular PT, neuro-optometry, occupational therapy) if symptoms persist > 2–4 weeks |
| All TBI patients | Screen for depression, anxiety, PTSD, and substance use during recovery; refer for behavioral health support as needed |
10.2 Components of TBI Rehabilitation
| Service | Focus |
|---|---|
| Physical therapy | Mobility, balance, vestibular rehabilitation, strength, endurance |
| Occupational therapy | Activities of daily living (ADLs), cognitive rehabilitation, visual-perceptual training, return-to-work support |
| Speech-language pathology | Cognitive-linguistic skills, communication, swallowing (dysphagia management) |
| Neuropsychology | Cognitive assessment, behavioral management, emotional adjustment, return-to-school/work evaluation |
| Physiatry (PM&R) | Team coordination, spasticity management (botulinum toxin, intrathecal baclofen), heterotopic ossification prevention, post-traumatic neuroendocrine dysfunction screening |
| Social work | Caregiver support, insurance navigation, community resources, discharge planning |
| Psychiatry | Pharmacologic management of post-TBI depression, agitation, psychosis, sleep disorders |
10.3 Post-Traumatic Neuroendocrine Dysfunction
Pituitary dysfunction occurs in approximately 25–50% of patients after moderate-to-severe TBI and is frequently underdiagnosed.17
| Deficit | Prevalence | Screening | Clinical Impact |
|---|---|---|---|
| Growth hormone deficiency | 10–20% | IGF-1, GH stimulation test | Fatigue, cognitive impairment, reduced quality of life |
| Hypogonadism | 10–15% | Testosterone (males), estradiol/LH/FSH (females) | Fatigue, mood disturbance, sexual dysfunction, osteoporosis |
| Hypothyroidism | 5–10% | TSH, free T4 | Fatigue, cognitive slowing, weight gain |
| Adrenal insufficiency | 5–10% | Morning cortisol, ACTH stimulation test | Potentially life-threatening; hypotension, fatigue, hyponatremia |
| Diabetes insipidus | 2–5% (acute); < 1% chronic | Urine output, serum/urine osmolality, serum sodium | Polyuria, hypernatremia if not recognized |
Recommendation: Screen for neuroendocrine dysfunction at 3–6 months and 12 months post-injury in all patients with moderate-to-severe TBI. Earlier screening if clinically suspected.17
10.4 Disorders of Consciousness After Severe TBI
| State | Definition | Prognosis |
|---|---|---|
| Coma | No eye opening, no command following, no purposeful behavior | Typically transitions to VS or emerges within 2–4 weeks |
| Vegetative state (VS) / Unresponsive wakefulness syndrome | Eyes open spontaneously (sleep-wake cycles present) but no awareness of self or environment; no purposeful behavior | If persists > 12 months after TBI = permanent VS (very low chance of meaningful recovery) |
| Minimally conscious state (MCS) | Inconsistent but reproducible evidence of awareness (visual tracking, command following, gestural or verbal yes/no, reaching for objects) | Better prognosis than VS; continued improvement possible over years |
| MCS+ | Demonstrates command following or intelligible verbalization | More favorable prognosis than MCS− |
| MCS− | Demonstrates visual pursuit, localization of pain, or emotional responses but no command following | Less favorable than MCS+ |
| Post-traumatic confusional state | Alert and interactive but confused, agitated, amnestic (Rancho Los Amigos Scale IV–VI) | Expected transitional phase; most patients continue to improve |
Assessment Tools for Disorders of Consciousness:
| Tool | Description |
|---|---|
| Coma Recovery Scale-Revised (CRS-R) | Gold standard for assessing consciousness level; evaluates auditory, visual, motor, oromotor, communication, and arousal functions. Distinguishes VS from MCS |
| Rancho Los Amigos Scale | 10-level scale describing cognitive and behavioral recovery stages after TBI. Levels I–III (coma to VS); IV–VI (confused/agitated); VII–VIII (appropriate/purposeful); IX–X (community reintegration) |
| GOS-E (Glasgow Outcome Scale — Extended) | 8-point outcome scale used in TBI research: 1 (dead), 2 (vegetative), 3–4 (severe disability), 5–6 (moderate disability), 7–8 (good recovery) |
11. Quality Metrics and Benchmarks in TBI Care
| Metric | Target |
|---|---|
| Time to CT (severe TBI) | < 25 minutes from arrival |
| Time to OR (surgical TBI) | < 60 minutes from decision to operate |
| Avoidance of hypoxemia (SpO2 < 90%) | 0 episodes during resuscitation |
| Avoidance of hypotension (SBP < 90) | 0 episodes during resuscitation |
| ICP monitoring placed (GCS ≤ 8 with abnormal CT) | > 80% compliance |
| Seizure prophylaxis initiated (severe TBI) | > 90% within 24 hours |
| VTE prophylaxis initiated | Mechanical: within 24 hours; pharmacologic: within 24–72 hours |
| Nutrition initiated | Enteral feeding within 72 hours |
| Screening for neuroendocrine dysfunction | At 3–6 months post-injury |
| Rehabilitation referral | Before acute care discharge |
Patricios JS, Schneider KJ, Dvorak J, et al. “Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport — Amsterdam, October 2022.” Br J Sports Med. 2023;57(11):695-711. DOI: 10.1136/bjsports-2023-106898 ↩︎ ↩︎ ↩︎ ↩︎ ↩︎
Echemendia RJ, Brett BL, Broglio S, et al. “Sport Concussion Assessment Tool — 6th Edition (SCAT6).” Br J Sports Med. 2023;57(11):622-631. DOI: 10.1136/bjsports-2023-106849 ↩︎
Leddy JJ, Haider MN, Ellis MJ, et al. “Exercise is medicine for concussion.” Curr Sports Med Rep. 2018;17(8):262-270. DOI: 10.1249/JSR.0000000000000505 ↩︎ ↩︎
DeMatteo C, Stazyk K, Singh SK, et al. “Development of a conservative protocol to return children and youth to activity following concussive injury.” Clin Pediatr (Phila). 2015;54(2):152-163. DOI: 10.1177/0009922814540034 ↩︎ ↩︎
McCrory P, Meeuwisse W, Dvorak J, et al. “Consensus statement on concussion in sport — the 5th international conference on concussion in sport held in Berlin, October 2016.” Br J Sports Med. 2017;51(11):838-847. DOI: 10.1136/bjsports-2017-097699 ↩︎
Kochanek PM, Tasker RC, Carney N, et al. “Guidelines for the Management of Pediatric Severe Traumatic Brain Injury, Third Edition.” Pediatr Crit Care Med. 2019;20(3S Suppl 1):S1-S82. DOI: 10.1097/PCC.0000000000001735 ↩︎
Kuppermann N, Holmes JF, Dayan PS, et al. “Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study.” Lancet. 2009;374(9696):1160-1170. DOI: 10.1016/S0140-6736(09)61558-0 ↩︎
Christian CW, Block R; Committee on Child Abuse and Neglect. “Abusive head trauma in infants and children.” Pediatrics. 2009;123(5):1409-1411. DOI: 10.1542/peds.2009-0408 ↩︎
Taylor A, Butt W, Rosenfeld J, et al. “A randomized trial of very early decompressive craniectomy in children with traumatic brain injury and sustained intracranial hypertension.” Childs Nerv Syst. 2001;17(3):154-162. DOI: 10.1007/s003810000410 ↩︎
Thompson HJ, McCormick WC, Kagan SH. “Traumatic brain injury in older adults: epidemiology, outcomes, and future implications.” J Am Geriatr Soc. 2006;54(10):1590-1595. DOI: 10.1111/j.1532-5415.2006.00894.x ↩︎
Frontera JA, Lewin JJ III, Rabinstein AA, et al. “Guideline for reversal of antithrombotics in intracranial hemorrhage: a statement for healthcare professionals from the Neurocritical Care Society and Society of Critical Care Medicine.” Neurocrit Care. 2016;24(1):6-46. DOI: 10.1007/s12028-015-0222-x ↩︎
Steyerberg EW, Mushkudiani N, Perel P, et al. “Predicting outcome after traumatic brain injury: development and international validation of prognostic scores based on admission characteristics.” PLoS Med. 2008;5(8):e165. DOI: 10.1371/journal.pmed.0050165 ↩︎ ↩︎
MRC CRASH Trial Collaborators. “Predicting outcome after traumatic brain injury: practical prognostic models based on large cohort of international patients.” BMJ. 2008;336(7641):425-429. DOI: 10.1136/bmj.39461.643438.25 ↩︎
Bazarian JJ, Biberthaler P, Welch RD, et al. “Serum GFAP and UCH-L1 for prediction of absence of intracranial injuries on head CT (ALERT-TBI): a multicentre observational study.” Lancet Neurol. 2018;17(9):782-789. DOI: 10.1016/S1474-4422(18)30231-X ↩︎
Undén J, Ingebrigtsen T, Romner B; Scandinavian Neurotrauma Committee. “Scandinavian guidelines for initial management of minimal, mild and moderate head injuries in adults: an evidence and consensus-based update.” BMC Med. 2013;11:50. DOI: 10.1186/1741-7015-11-50 ↩︎
Turner-Stokes L, Pick A, Nair A, et al. “Multi-disciplinary rehabilitation for acquired brain injury in adults of working age.” Cochrane Database Syst Rev. 2015;(12):CD004170. DOI: 10.1002/14651858.CD004170.pub3 ↩︎
Schneider HJ, Kreitschmann-Andermahr I, Ghigo E, Stalla GK, Agha A. “Hypothalamopituitary dysfunction following traumatic brain injury and aneurysmal subarachnoid hemorrhage: a systematic review.” JAMA. 2007;298(12):1429-1438. DOI: 10.1001/jama.298.12.1429 ↩︎ ↩︎