What is the recommended treatment for traumatic brain injury (TBI)?

Treatment for Traumatic Brain Injury

Severe TBI management centers on controlling intracranial pressure through a tiered approach: first-line medical management with sedation, osmotherapy (mannitol 20% or hypertonic saline at 250 mOsm), and maintaining cerebral perfusion pressure 60-70 mmHg; followed by external ventricular drainage for refractory cases; and finally decompressive craniectomy as a last resort for life-threatening intracranial hypertension, though this reduces mortality at the cost of increased severe disability. 1

Initial Stabilization and Airway Management

Control ventilation immediately through tracheal intubation with continuous end-tidal CO2 monitoring, even in the pre-hospital setting 1. This is critical because:

• Hypocapnia causes cerebral vasoconstriction and secondary brain ischemia
• Maintaining PaCO2 within normal range (35-40 mmHg) prevents both ischemia and increased ICP
• Avoid prolonged hypocapnia (PaCO2 <30 mmHg) as it worsens neurological outcomes 1

Neurosurgical Indications (Immediate)

Operate urgently for 1:

• Symptomatic extradural hematoma (any location)
• Acute subdural hematoma >5mm thickness with midline shift >5mm
• Acute hydrocephalus requiring drainage
• Open displaced skull fracture
• Closed displaced skull fracture with brain compression (>5mm thickness, midline shift >5mm)

ICP Monitoring Strategy

Monitor ICP when neurological assessment is not feasible and CT shows 1:

• Compressed or absent basal cisterns (>70% chance of ICP >30 mmHg)
• Midline shift >5mm
• Intracerebral hematoma >25mL
• Traumatic subarachnoid hemorrhage

**Target ICP <20 mmHg.** ICP 20-40 mmHg increases mortality risk 3.95-fold; ICP >40 mmHg increases it 6.9-fold 1.

Cerebral Perfusion Pressure Management

Maintain CPP 60-70 mmHg 1:

• CPP <60 mmHg associates with poor outcomes
• CPP >70 mmHg increases respiratory complications without improving outcomes
• CPP >90 mmHg worsens outcomes due to vasogenic edema
• In patients with impaired autoregulation, prioritize ICP control over high CPP targets

Tiered Treatment Algorithm for Intracranial Hypertension

Tier 1: First-Line Medical Management

1. Sedation and analgesia - no single agent proven superior; avoid boluses causing hypotension 1
2. Osmotherapy (Grade 1+ recommendation) 1:
   • Mannitol 20% OR hypertonic saline
   • Dose: 250 mOsm infused over 15-20 minutes
   • Maximum effect at 10-15 minutes, duration 2-4 hours
   • Mannitol requires volume replacement; hypertonic saline causes hypernatremia/hyperchloremia
   • Both equally effective at equiosmotic doses
   • Use for threatened herniation (mydriasis, anisocoria) or neurological deterioration

Tier 2: External Ventricular Drainage

Perform EVD for persistent intracranial hypertension despite Tier 1 interventions (Grade 2+) 1:

• Small CSF volumes can dramatically reduce ICP
• Consider neuronavigation for insertion
• Remove mass-effect brain contusions if first-line treatments fail

Tier 3: Decompressive Craniectomy

Reserve for refractory intracranial hypertension after multidisciplinary discussion (Grade 2+) 2, 1:

The evidence is contradictory but clear:

• Mortality benefit: RESCUE-ICP showed 26.9% mortality vs 48.9% with medical management alone 1
• Disability trade-off: More survivors with severe disability (8.5% vs 2.1% vegetative state)
• No difference in favorable outcomes at 6 months (26.6% medical vs 27.4% surgical) 1

Critical technical points 2, 1:

• Large craniectomy required (>100 cm²)
• Bifrontal approach for diffuse injuries
• Lateral temporal approach for focal lesions/hematomas
• Insufficient decompression size associates with poor outcomes
• Age considerations: most studies excluded patients >60-70 years

The 2020 update positions decompressive craniectomy as a Tier 3 treatment option - it saves lives but increases severe disability 2. Family discussions about acceptable quality of life are essential before proceeding.

What NOT to Do

Strongly Contraindicated (Grade 1-)

• High-dose glucocorticoids - CRASH trial showed increased mortality in >10,000 patients 1
• 4% albumin solution - 24.5% mortality vs 15.1% with saline (RR 1.62) 1

Not Recommended (Grade 2-)

• Prolonged hypernatremia - weak ICP relationship, risk of rebound, renal complications 1
• Prolonged hypocapnia - worsens outcomes through secondary ischemia 1
• Prophylactic antiepileptic drugs - no benefit for preventing seizures, increased side effects with phenytoin 1

Glucose Management

Maintain serum glucose 8-11 mmol/L (1.4-2 g/L) (Grade 1+) 1. Both hyperglycemia and hypoglycemia worsen outcomes.

Hemodynamic Targets

• Avoid hypotension - single episode worsens prognosis
• Minimize vasopressor use when possible
• Consider plasma-based resuscitation over crystalloid-only strategies

Imaging and Polytrauma Considerations

Perform whole-body CT once hemodynamics and respiratory function are stabilized 1. In unstable patients, control hemorrhage before neuroimaging - only 2.5% have neurosurgical lesions vs 21% requiring urgent hemostasis 1.

Avoid non-life-threatening extracranial surgery in the presence of intracranial hypertension - high risk of intraoperative cerebral hypoperfusion 1.

Common Pitfalls

1. Prophylactic osmotherapy without ICP elevation - no outcome benefit 1
2. Aggressive hyperventilation - causes cerebral ischemia even at PaCO2 30 mmHg 1
3. Early bifrontal craniectomy - DECRA showed 70% poor outcomes vs 51% with medical management 1
4. Using albumin for volume resuscitation - significantly increases mortality 1
5. Targeting CPP >70 mmHg routinely - increases ARDS without neurological benefit 1