Severe Traumatic Brain Injury
What is Severe Traumatic Brain Injury?
Severe traumatic brain injury (sTBI) is a post-traumatic brain injury characterized by a Glasgow Coma Scale (GCS) ≤ 8 for at least 6 hours, or rapid neurological deterioration requiring emergency neurosurgical intervention. It is a life-threatening emergency with a high risk of functional sequelae (severe neurological and cognitive impairments).
Traumatic brain injuries are classified into three categories according to the Glasgow Coma Scale:
- Mild traumatic brain injury: GCS 14-15 (90% of TBIs).
- Moderate traumatic brain injury: GCS 9-13 (5%).
- Severe traumatic brain injury: GCS ≤ 8 (5%).
sTBI is the leading cause of death and severe disability in young people (< 45 years). sTBI mortality is 30 to 40% in adults, and the rate of severe neurological sequelae (persistent vegetative state, total dependency) reaches 20-30% of survivors. In Tunisia, our neurosurgery and neuro-intensive care departments are equipped to manage these patients according to the recommendations of the Brain Trauma Foundation and the French Language Society of Neurosurgery (SNCLF).
What are the Causes and Associated Injuries?
The main causes of severe traumatic brain injury are:
- Road traffic accidents (RTA): 50-60% (pedestrians, two-wheelers, vehicles).
- Falls from height: 20-30% (elderly, intoxicated individuals).
- Domestic and sports accidents: 10-15%.
- Assaults (blows, knives, firearms): 5-10%.
Post-traumatic brain injuries are classified as:
- Primary injuries (immediate): cerebral contusions, acute subdural hematoma, epidural hematoma, intraparenchymal hematoma, diffuse axonal injury (DAI), subarachnoid hemorrhage, depressed skull fracture.
- Secondary injuries (early and late): cerebral edema (vasogenic, cytotoxic), intracranial hypertension (ICH), post-traumatic cerebral ischemia, post-traumatic hydrocephalus, infections (meningitis, abscess), post-traumatic epilepsy.
What are the Signs of Severe Traumatic Brain Injury? (Glasgow Coma Scale)
The Glasgow Coma Scale (GCS) is the standard tool for neurological assessment. It evaluates three parameters:
| Parameter | Response | Score |
|---|---|---|
| Eye opening | Spontaneous | 4 |
| To voice | 3 | |
| To pain | 2 | |
| None | 1 | |
| Verbal response | Oriented | 5 |
| Confused | 4 | |
| Inappropriate words | 3 | |
| Incomprehensible sounds | 2 | |
| None | 1 | |
| Motor response | Obeys commands | 6 |
| Localizes pain | 5 | |
| Withdraws to pain | 4 | |
| Abnormal flexion (decorticate) | 3 | |
| Abnormal extension (decerebrate) | 2 | |
| None | 1 | |
| Total score | 3 to 15 | |
A Glasgow Coma Scale score ≤ 8 defines severe traumatic brain injury.
Other clinical signs should raise concern: anisocoria (pupil inequality), signs of intracranial hypertension (bradycardia, arterial hypertension, respiratory rhythm disturbances), otorrhea (ear bleeding), epistaxis, periorbital ecchymosis (raccoon sign), retroauricular ecchymosis (Battle sign), post-traumatic seizures.
How is Severe Traumatic Brain Injury Managed in Tunisia?
Management follows the guidelines of the Brain Trauma Foundation (4th edition, 2016-2020) and the structured protocol for severe traumatic brain injury.
Pre-hospital Management (At the Accident Scene)
- ABCDE protocol: Airway, Breathing, Circulation, Disability (Glasgow Coma Scale), Environment (hypothermia prevention).
- Intubation and mechanical ventilation: any patient with GCS ≤ 8 must be intubated (airway protection, hypoxia prevention). Target SpO2 ≥ 90-95%, PaCO2 35-40 mmHg.
- Strict cervical spine immobilization (cervical collar, backboard).
- Fluid resuscitation: maintaining mean arterial pressure (MAP) ≥ 80 mmHg (crystalloid infusion, norepinephrine if necessary).
- Transport to a hospital with 24/7 neurosurgery (CT scan, operating room, neuro-intensive care unit).
Emergency Imaging (Upon Arrival at the Emergency Department)
- Non-contrast brain CT scan (in less than 15 minutes). Search for: skull fracture (linear, depressed), subdural hematoma (hyperdense crescent-shaped), epidural hematoma (hyperdense biconvex), hemorrhagic contusions, subarachnoid hemorrhage, herniation (temporal engagement), acute hydrocephalus.
- Whole body CT scan (polytrauma): search for associated injuries (chest, abdomen, pelvis, limbs).
- CT angiography (if suspected traumatic arterial dissection).
Neurosurgical Treatment
Emergency surgical indications are:
- Symptomatic epidural hematoma (EDH) (thickness > 10 mm, mass effect, GCS ≤ 9) → evacuation via craniotomy.
- Acute subdural hematoma (ASDH) (thickness > 10 mm, midline shift > 5 mm) → evacuation via craniotomy or decompressive craniectomy.
- Multiple cerebral contusions with mass effect or herniation → contusion evacuation +/- decompressive craniectomy.
- Depressed skull fracture with depression > skull thickness, dural tear, or underlying hematoma → elevation and dural repair.
- Large post-traumatic intraparenchymal hematoma (> 30 mL) with mass effect → evacuation.
Neuro-Intensive Care Management (ICP Monitoring)
Any patient with sTBI and an abnormal CT scan (operated or non-operated lesions, contusions, edema) should undergo intracranial pressure (ICP) monitoring using an intraparenchymal (Camino, Codman) or intraventricular transducer. Targets:
- Target intracranial pressure (ICP) < 20-22 mmHg (therapeutic threshold).
- Cerebral perfusion pressure (CPP = MAP - ICP) > 60 mmHg (target 60-70 mmHg).
- Prevention of ICH peaks: sedation (propofol, midazolam, fentanyl), CSF drainage via external ventricular drain (EVD), moderate hyperventilation (PaCO2 32-35 mmHg, transient if herniation).
- Treatment of refractory ICH:
- Hypertonic saline (7.5% or 20%): 2-4 mL/kg bolus.
- Mannitol (20%): 0.5-1 g/kg (if serum osmolarity < 320 mOsm/L).
- Decompressive craniectomy (removal of a bone flap to allow brain swelling).
- Barbiturates (thiopental) as last resort (side effects: hypotension, respiratory depression).
- Avoid hypotension (MAP < 80-90 mmHg): fluid resuscitation, norepinephrine.
- Avoid hypoxia (SpO2 < 90-95%): mechanical ventilation, moderate PEEP.
- Glycemic control (target 6-10 mmol/L).
- Prevention of post-traumatic seizures (epilepsy): phenytoin or levetiracetam for 7 days.
Decompressive Craniectomy (Salvage Technique)
Decompressive craniectomy (hemicraniectomy or bifrontal) involves removing a large bone flap (bone flap) to allow the swollen brain to expand, thus preventing brain herniation. Indications: refractory ICH despite medical treatment, young patients with diffuse injuries or ASDH with major edema. Mortality is reduced, but the rate of severe disability (vegetative state) remains high (30-50%). Cranioplasty (replacement of the bone flap) is performed secondarily (6-12 months later).
What are the Risks and Complications of Severe Traumatic Brain Injury?
Complications are frequent and severe:
- Refractory intracranial hypertension (brain herniation → death).
- Post-operative hemorrhage (reoperation).
- Neurological infections: post-traumatic meningitis, cerebral abscess, surgical site infection.
- Post-traumatic hydrocephalus (30% of severe sTBIs) requiring ventricular shunt (VPS).
- Early (< 7 days) or late (> 7 days) post-traumatic epilepsy.
- Persistent vegetative state (> 1 month) or minimally conscious state (MCS).
- CSF fistula (otorrhea, rhinorrhea) → risk of meningitis.
- Coagulation disorders (post-traumatic DIC).
- Severe neurological sequelae: hemiplegia, quadriplegia, language disorders (aphasia), cognitive disorders (dysexecutive syndrome, memory disorders, attention deficit), behavioral disorders (agitation, apathy, disinhibition), cortical blindness.
Prognosis of Severe Traumatic Brain Injury
Prognosis depends on several initial factors: age, Glasgow Coma Scale, pupil size (reactivity), presence of initial hypotension or hypoxia, CT scan findings (Marshall classification).
- Overall mortality: 30-40% (adult), 20-30% (child).
- Favorable recovery (GOS 4-5: moderate to complete independence): 40-50% of survivors.
- Severe disability (GOS 3): 15-25%.
- Persistent vegetative state (GOS 2): 5-10%.
What to Do After Severe Traumatic Brain Injury? Intensive Neurological Rehabilitation
Post-sTBI rehabilitation is long (several months to years) and multidisciplinary:
- Physical therapy: gait restoration (gait training, orthoses), spasticity reduction (botulinum toxin), contracture prevention.
- Occupational therapy: relearning activities of daily living (dressing, washing, eating), home adaptation.
- Speech therapy: language rehabilitation (aphasia), swallowing rehabilitation (aspiration risk), communication disorders.
- Neuropsychology: intensive cognitive rehabilitation (memory, attention, executive functions, planning), cognitive remediation.
- Psychologist / Psychiatrist: management of behavioral disorders, anxiety, depression, post-traumatic stress disorder.
- Social work: assistance with returning to work, disability recognition (disability card), home adaptation.
- Neurosurgical and neurological follow-up: consultations at 3, 6, 12 months, control brain MRI, EEG (epilepsy), cranioplasty (bone flap replacement).
Why Choose Tunisia for the Management of Severe Traumatic Brain Injury?
Tunisia has neurosurgeons and intensivists trained in the best European centers (Paris, Lyon, Marseille, Bordeaux, Geneva, Brussels). Neurosurgery and intensive care equipment is modern: 128 and 256-slice CT scanners, dedicated neurosurgery operating rooms (operating microscope, neuronavigation, ventricular drainage), ICP monitoring (intraparenchymal transducers), 24/7 neuro-intensive care units.
Advantages
- Rapid intervention times: CT scan < 15 min, hematoma evacuation < 2-4 hours (European standards).
- Systematic ICP monitoring according to Brain Trauma Foundation guidelines.
- All-inclusive packages: our packages include neuro-ICU hospitalization, initial CT scan, surgical procedure (craniectomy, hematoma evacuation, ICP transducer placement), ICP monitoring, mechanical ventilation, and the post-sTBI neurological rehabilitation program (physical therapy, speech therapy, neuropsychology).
- Management of chronic sequelae: neurological rehabilitation centers available for extended stays (6-12 weeks) at affordable rates.