Traumatic Brain Injury: Secondary Injury Prevention and Neuroprotection

Quick Answer

Traumatic brain injury (TBI) management focuses on preventing secondary brain injury caused by hypotension, hypoxia, hypercapnia, and intracranial hypertension. Cerebral perfusion pressure (CPP) should be maintained at 60-70 mmHg to ensure adequate brain perfusion while avoiding excessive pressure that may cause acute respiratory distress syndrome (ARDS). Intracranial pressure (ICP) should be treated when sustained above 22 mmHg. Key interventions include hyperosmolar therapy (mannitol or hypertonic saline), ventilation strategies (avoid prophylactic hyperventilation), temperature control (targeted normothermia, avoid hyperthermia), and multimodal neuromonitoring to guide individualised therapy. The role of decompressive craniectomy remains controversial—while it reduces ICP, it has not consistently improved functional outcomes in trials like DECRA and RESCUEicp.

Clinical Pearl: Hypotension (SBP <100 mmHg) is the single most important secondary insult predictor of poor outcome in TBI. One episode of hypotension doubles mortality risk.[1]

Epidemiology and Classification

Global Burden of TBI

Mechanism of Injury

[9,10,11]

Severity Classification (Glasgow Coma Scale)

GCS Components:

• Eye opening: 1-4 (spontaneous, to speech, to pain, none)
• Verbal response: 1-5 (oriented, confused, inappropriate words, incomprehensible sounds, none)
• Motor response: 1-6 (obeys commands, localises, withdraws, flexion, extension, none)

Important: GCS is affected by sedation, intubation, orbital trauma, and alcohol. Document components and reason if untestable.[12,13]

Pathophysiology

Primary vs Secondary Injury

Primary Injury (immediate, irreversible):

• Direct mechanical damage at time of impact
• Contusions, lacerations, haematomas
• Axonal shearing (diffuse axonal injury)
• Skull fractures

Secondary Injury (preventable, time-dependent):

• Ischaemia (hypotension, hypoxia, vasospasm)
• Excitotoxicity (glutamate release)
• Inflammation
• Cerebral oedema
• Intracranial hypertension
• Hypercapnia/hypocapnia
• Hyperglycaemia
• Seizures
• Pyrexia

Clinical Goal: Prevent and treat secondary injury to salvage at-risk neurons (penumbra).[14,15]

Intracranial Pressure Dynamics

Monroe-Kellie Doctrine:

• The cranium is a fixed, non-expandable vault (except in infants with open fontanelles)
• Contents: brain (80%), blood (10%), CSF (10%)
• Increase in one component requires decrease in others to maintain normal ICP

Compensatory Mechanisms (exhausted at critical volume):

1. Displacement of CSF to spinal subarachnoid space
2. Reduced cerebral blood volume (venous compression)
3. Compression of brain parenchyma

Decompensation: Once compensatory reserve exhausted, small volume increases → large ICP rises

Normal ICP: <15 mmHg (adults), <10 mmHg (children), <5 mmHg (infants) Elevated ICP: >20-22 mmHg sustained Critical ICP: >40 mmHg (cerebral herniation risk)[16,17]

Cerebral Blood Flow and Autoregulation

Cerebral Perfusion Pressure (CPP):

CPP = MAP - ICP
(or CVP if CVP > ICP)

Normal CPP: 60-80 mmHg Target CPP in TBI: 60-70 mmHg (per BTF Guidelines)

Cerebral Autoregulation:

• Maintains constant CBF across wide MAP range (60-160 mmHg)
• Impaired in severe TBI (40-50% of patients)
• Loss of autoregulation = pressure-passive circulation (CBF varies with MAP)
• "Dysautoregulation" requires tight BP control

Factors Affecting Cerebral Blood Flow:

[18,19,20]

Assessment and Monitoring

Neurological Examination

Initial Assessment (before sedation if possible):

• Glasgow Coma Scale (document components)
• Pupillary examination (size, reactivity, asymmetry)
• Focal neurological signs (hemiparesis, posturing)
• Signs of raised ICP (Cushing's triad: hypertension, bradycardia, irregular respiration—late sign)

Serial Monitoring:

• Hourly GCS (if not sedated)
• Pupillary checks (especially if ICP rising)
• Limb movements
• Seizure activity

Intracranial Pressure Monitoring

Indications for ICP Monitoring (BTF Guidelines):

1. Severe TBI (GCS 3-8) + abnormal CT scan
2. Severe TBI + normal CT + age >40 + motor posturing + SBP <90
3. Moderate TBI if high-risk features or planned for operative management
4. After craniotomy for mass lesion

Monitoring Modalities:

[21,22,23]

Multimodal Monitoring

Beyond ICP—Comprehensive Assessment:

[24,25,26]

General Management Principles

Airway and Ventilation

Indications for Intubation in TBI:

• GCS ≤8 (protect airway)
• Loss of airway reflexes
• Hypoventilation (PaCO₂ >6 kPa or <4 kPa)
• Hypoxia (SpO₂ <90% on supplemental O₂)
• Severe facial trauma compromising airway
• Need for sedation/paralysis for ICP control
• Before transfer (helicopter/ambulance)

Ventilation Targets:

Prophylactic Hyperventilation: NOT recommended in first 24 hours (causes cerebral ischaemia by vasoconstriction). May be used as temporising measure for acute herniation only.[27,28,29]

Haemodynamic Management

Blood Pressure Targets (BTF Guidelines):

• Age 50-69: SBP ≥100 mmHg
• Age 15-49 or >70: SBP ≥110 mmHg
• MAP: Maintain ≥80 mmHg
• CPP: Target 60-70 mmHg (individualise based on autoregulation status)

Fluid Management:

• Isotonic crystalloids (0.9% saline, Hartmann's)
• Avoid hypotonic fluids (dextrose solutions) → cerebral oedema
• Maintain euvolaemia (avoid hypo- and hypervolaemia)
• Haemoglobin: Target 70-90 g/L (permissive anaemia acceptable if no active ischaemia)
• Albumin: Avoid (SAFE trial showed harm in TBI subset)

Vasoactive Support:

• Norepinephrine: First-line vasopressor
• Phenylephrine: Pure vasoconstriction (avoid if concerns about reduced CO)
• Vasopressin: Second-line
• Avoid excessive vasoconstriction (may reduce CO and CBF)

[30,31,32,33]

Specific Neuroprotective Strategies

Positioning

Head Position:

• Elevate head 30-45° (reduces ICP by improving venous drainage)
• Keep head midline (avoid neck rotation/ flexion that impairs jugular venous return)
• Avoid tight ETT ties/collars (venous compression)

Caution with prone positioning (rarely used in severe TBI due to ICP concerns)

[34]

Temperature Management

Target: Normothermia (36.0-37.0°C)

Pyrexia Avoidance:

• Hyperthermia ↑ cerebral metabolic rate (CMRO₂) by 5-7% per °C
• Increases excitotoxicity and secondary injury
• Treat aggressively: paracetamol, active cooling

Prophylactic Hypothermia:

• NOT recommended (Level II B against—early, short-term hypothermia does not improve outcomes)
• May be used for refractory ICP elevation
• Risk of coagulopathy, immunosuppression

[35,36]

Glycaemic Control

Target: 6-10 mmol/L (108-180 mg/dL)

• Hyperglycaemia (>10 mmol/L): Associated with worse outcomes
• Hypoglycaemia (<4 mmol/L): Neurotoxic, must be avoided
• Insulin protocol: Tight control not recommended (risk of hypoglycaemia)
• Regular monitoring (hourly if on insulin infusion)

[37,38]

Seizure Prophylaxis

Early Post-Traumatic Seizures (<7 days):

• Incidence: 4-25%
• Risk factors: GCS <10, depressed skull fracture, contusion, haematoma
• Phenytoin recommended for first 7 days (reduces early seizures)
• Does NOT improve long-term outcomes

Late Post-Traumatic Seizures (>7 days):

• NOT recommended to prevent with anticonvulsants
• Treat if seizures occur

Alternative: Levetiracetam increasingly used (similar efficacy, fewer side effects than phenytoin)[39,40,41]

Deep Vein Thrombosis Prophylaxis

Challenge: Balance thrombosis risk vs bleeding risk

Strategy:

• Mechanical prophylaxis: IPC boots immediately (safe, effective)
• Pharmacological prophylaxis: Delay 24-48 hours if stable, longer if ongoing bleeding risk
• LMWH or UFH: Consider once haemorrhagic lesions stable on repeat CT
• IVC filter: Only if high VTE risk and contraindication to anticoagulation

[42,43]

Intracranial Pressure Management

Tiered Approach to ICP Management

Tier 0: Basic Measures (all TBI patients):

• Head elevation 30-45°
• Midline head position
• Normocapnia (PaCO₂ 4.5-5.0 kPa)
• Normothermia
• Normoglycaemia
• Adequate sedation
• Seizure prophylaxis (if indicated)

Tier 1: First-Line Interventions (ICP >22 mmHg):

1. Sedation optimization (adequate depth)
2. CSF drainage (if EVD in situ)
3. Hyperosmolar therapy (mannitol or hypertonic saline)

Tier 2: Second-Line Interventions (refractory ICP):

1. Neuromuscular blockade (abolishes coughing, straining)
2. Hyperventilation (temporary measure only)
3. Therapeutic hypothermia (32-35°C)
4. Decompressive craniectomy

Tier 3: Rescue Therapy (life-threatening refractory ICP):

1. Barbiturate coma (high-dose thiopentone)
2. Bilateral decompressive craniectomy

[44,45,46]

Hyperosmolar Therapy

Goal: Create osmotic gradient to draw water from brain parenchyma → extracellular space → systemic circulation

Mannitol

Contraindications/Precautions:

• Serum osmolality >320 mOsm/kg (limit use)
• Severe hypovolaemia (causes hypotension)
• Acute renal failure

Hypertonic Saline (3%, 5%, 7.5%, 23.4%)

Advantages over Mannitol:

• Longer duration of action
• Less rebound oedema
• Volume expansion (beneficial if hypovolaemic)
• No renal toxicity
• Increases CPP

Risks:

• Central pontine myelinolysis (if rapid sodium shifts)
• Hyperchloraemic metabolic acidosis
• Coagulopathy (high concentrations)

Evidence: Both effective; no clear superiority in meta-analyses. Choice based on patient factors and clinician preference.[47,48,49,50]

Decompressive Craniectomy (DC)

Procedure: Removal of bone flap (usually large frontotemporoparietal), opening of dura, allowing brain to expand externally

Indications (controversial):

1. Refractory intracranial hypertension (>22 mmHg) despite maximal medical therapy
2. Significant mass effect with clinical deterioration
3. Evacuation of mass lesion + prophylactic DC (more accepted)

Evidence from RCTs:

Conclusion: DC reduces ICP and mortality but does not consistently improve functional outcomes. Decision requires careful consideration of patient/family wishes and individual circumstances.

BTF 4th Edition (2020) Recommendations:

• Level II A: Large frontotemporoparietal DC (≥12×15 cm) recommended over small DC
• Level II A: Secondary DC for late refractory ICP recommended to improve mortality and favourable outcomes
• Level II A: Secondary DC for early refractory ICP NOT recommended to improve mortality/outcomes

[51,52,53,54,55]

Anaesthetic Considerations

Induction Agents

Choice: Depends on haemodynamic status. Thiopentone or propofol preferred if stable; etomidate or ketamine if unstable.

[56,57,58]

Maintenance

Total Intravenous Anaesthesia (TIVA) vs Volatile:

• TIVA (propofol): Preferred for neuro cases; ↓ CMRO₂, ↓ CBF, ↓ ICP; seizure risk with prolonged high-dose
• Volatile agents: All increase CBF at >1 MAC; dose-dependent neuroprotection (preconditioning)
• Xenon: Emerging neuroprotective agent (NMDA antagonist)

Multimodal approach: Low-dose volatile + opioid + propofol infusion

Muscle Relaxants

• Rocuronium or suxamethonium for RSI
• Avoid vecuronium if hepatic impairment
• Sugammadex available for rapid reversal if needed

Analgesia

• Fentanyl or remifentanil infusions
• Short-acting agents preferred (allows neuro assessment)
• Avoid long-acting opioids until stable

[59,60]

Special Scenarios

TBI in Anticoagulated Patients

Rapid Reversal Required:

Target: INR <1.4, anti-Xa activity minimal

[61,62]

Operative Management

Evacuation of Mass Lesions:

• Indications: Evacuate if >10 mm midline shift, GCS decline, mass effect on CT
• Timing: "Time is brain"—urgent but not emergency if stable
• Post-op care: Continue ICP monitoring; drain in subdural/subgaleal space

[63,64]

Indigenous Health Considerations

Aboriginal and Torres Strait Islander Peoples

Disproportionate Burden of TBI:

Aboriginal Australians experience 2-3 times higher rates of TBI compared to non-Indigenous populations, driven by:

• Higher rates of assault-related injury
• Motor vehicle accidents (often remote road conditions)
• Falls in remote community settings
• Interpersonal violence

Remote Practice Challenges:

Clinical Recommendations:

1. Early recognition and transfer: Low threshold for aeromedical retrieval
2. Telemedicine: Remote CT interpretation; neurosurgical consultation
3. Skills maintenance: Rural doctors maintaining intubation and ICP management skills
4. Cultural safety: Family involvement in care decisions; use of interpreters
5. Follow-up care: Access to rehabilitation services often limited; coordination with ACCHOs essential

Communication Considerations:

• Use of Aboriginal Health Workers for family communication
• Explanation of neuroprognostication limitations
• Discussion of organ donation (if relevant) with cultural sensitivity
• Palliative care coordination if poor prognosis

[65,66,67]

Māori Health Considerations

Trauma and TBI in Māori:

Māori experience higher rates of traumatic injury including TBI, particularly from:

• Road traffic accidents
• Assault and interpersonal violence
• Falls

Whānau Engagement:

• Early involvement in care decisions (whānau-centred care)
• Recognition that head injury affects not just individual but entire whānau
• Cultural advisors in ICU setting
• Māori Health Workers supporting communication

Equity Considerations:

• Ensure equivalent access to neurosurgical and ICU care regardless of location
• Address barriers to rehabilitation services
• Long-term follow-up and support services
• Address social determinants contributing to trauma risk

[68,69,70]

ANZCA Final Exam Focus

Key Viva Questions

Q: "What is the rationale for maintaining CPP at 60-70 mmHg in TBI, and what are the risks of targeting higher CPP?"

Model Answer: "The cerebral perfusion pressure target of 60-70 mmHg is based on the balance between ensuring adequate brain perfusion while avoiding complications of excessive pressure. A CPP below 60 mmHg risks cerebral ischaemia, particularly in areas with impaired autoregulation. However, aggressively targeting CPP above 70 mmHg using fluids and vasopressors increases the risk of ARDS due to hydrostatic pulmonary oedema and may cause systemic complications. The 60-70 mmHg range represents the optimal zone identified in studies showing improved outcomes without excessive systemic complications. Individual patients may require different targets based on their autoregulatory status, which can be assessed using multimodal monitoring including PbtO₂ or transcranial Doppler to identify the optimal CPP for each patient."

Q: "Discuss the evidence for and against decompressive craniectomy in TBI."

Model Answer: "Decompressive craniectomy is one of the most controversial topics in TBI management. The rationale is sound: removing a section of skull allows the swollen brain to expand externally, reducing ICP and potentially preventing cerebral herniation. However, the clinical trial evidence is mixed. The DECRA trial in 2011 randomised patients with severe TBI and ICP >20 mmHg refractory to first-tier therapy to bifrontotemporal DC vs standard care. Surprisingly, the DC group had worse functional outcomes at 6 months without mortality benefit. The RESCUEicp trial in 2016 took patients with refractory ICP despite first and second-tier therapies and showed that DC reduced mortality from 50% to 43% but at the cost of increased survival with severe disability or vegetative state. The 2020 BTF guidelines suggest DC reduces ICP and may improve mortality when performed for late refractory ICP elevation, but not for early refractory ICP. The key point is that while DC reliably reduces ICP, it has not consistently improved meaningful functional recovery, and decisions require careful discussion with families about acceptable outcomes."

Q: "A TBI patient becomes acutely hypotensive intraoperatively during evacuation of a subdural haematoma. What are your immediate concerns and management?"

Model Answer: "Acute hypotension in a TBI patient is a neurosurgical emergency because it compromises cerebral perfusion and exacerbates secondary brain injury. My immediate priority is to restore blood pressure rapidly while identifying the cause. I would simultaneously check the surgical field for bleeding, ensure adequate anaesthetic depth—not too deep—and give a fluid bolus. I would also prepare vasopressors, typically norepinephrine, to maintain MAP and CPP. Blood loss from the surgical site is the most likely cause, but I would also consider tension pneumothorax, especially if positive pressure ventilation is used, anaphylaxis if any new drugs were given, and myocardial dysfunction. I'd check surgical suction canister volumes and communicate with the surgeon immediately. The target is to restore systolic BP above 100 mmHg rapidly as even brief episodes of hypotension double mortality in TBI. If bleeding is identified, I'd request surgical control, continue resuscitation with blood products, and maintain communication with the team about ongoing losses."

SAQ Practice Question

Question (20 marks): A 22-year-old male is admitted to ICU following a severe TBI (GCS 6) from a high-speed motor vehicle accident. CT shows diffuse axonal injury with small contusions but no mass lesion requiring surgery. An intraparenchymal ICP monitor is inserted showing ICP 28 mmHg.

a) Outline your initial ICP management strategy (Tier 0 and Tier 1 interventions) (8 marks) b) The ICP remains elevated at 30 mmHg despite initial measures. Describe your Tier 2 and rescue options (8 marks) c) What prognostic factors would you consider when discussing prognosis with the family? (4 marks)

Model Answer:

a) Initial ICP management - Tier 0 and Tier 1 (8 marks):

Tier 0 - Basic measures (all TBI patients):

1. Head positioning: Elevate head 30-45°, maintain midline position
2. Temperature control: Maintain normothermia (36-37°C), treat pyrexia aggressively
3. Ventilation: Normocapnia (PaCO₂ 4.5-5.0 kPa), avoid prophylactic hyperventilation
4. Glycaemic control: Target glucose 6-10 mmol/L
5. Haemodynamics: Maintain CPP 60-70 mmHg, SBP >100 mmHg
6. Fluid management: Isotonic fluids, avoid hypotonic solutions
7. Seizure prophylaxis: Phenytoin or levetiracetam for 7 days
8. Sedation: Adequate depth to prevent coughing, straining

Tier 1 - First-line ICP interventions: 9. Sedation optimisation: Ensure adequate sedation (propofol infusion), consider boluses if agitation 10. Hyperosmolar therapy:

• Mannitol 0.25-1.0 g/kg IV bolus (if serum osmolality <320 mOsm/kg)
• OR 3% saline 250 mL IV bolus
• Monitor serum sodium and osmolality

11. CSF drainage: If EVD in place (not mentioned here but consider insertion)
12. Neuromuscular blockade: If refractory to above (prevents coughing, straining)

b) Tier 2 and rescue options for refractory ICP (8 marks):

Tier 2 - Second-line interventions:

1. Therapeutic hypothermia (32-35°C): Reduces CMRO₂ and CBF; risk of coagulopathy, immunosuppression
2. Controlled hyperventilation: PaCO₂ 4.0-4.5 kPa as temporary measure only; jugular oximetry to monitor for ischaemia
3. Metabolic suppression:

• High-dose barbiturate coma (thiopentone loading 3-5 mg/kg, then 1-4 mg/kg/hr)
• Requires haemodynamic support, EEG burst suppression monitoring
• Risk of hypotension, immunosuppression

4. Decompressive craniectomy:

• Large frontotemporoparietal craniectomy (≥12×15 cm)
• Evidence mixed (DECRA: no benefit; RESCUEicp: reduced mortality but more severe disability)
• Consider for refractory ICP >22 mmHg despite tier 2 therapies
• Requires neurosurgical consultation and family discussion about outcomes

Adjunctive measures: 5. Repeat imaging: Exclude new mass lesion, expanding contusion, hydrocephalus 6. Multimodal monitoring: PbtO₂, SjvO₂ to guide individualised therapy 7. Surgical evacuation: If contusions have expanded

c) Prognostic factors for family discussion (4 marks):

Favourable prognostic factors:

• Young age (better neuroplasticity)
• Pupillary reactivity preserved
• No hypoxic episode
• No hypotensive episode
• Better initial GCS (motor component particularly)
• No significant extracranial injuries
• Absence of diffuse axonal injury on MRI (if available)

Unfavourable prognostic factors:

• Age >60 years
• Fixed dilated pupils
• Hypotension (SBP <90 mmHg)
• Hypoxia (PaO₂ <8 kPa)
• Low initial GCS (3-4)
• Significant extracranial injuries
• Diffuse axonal injury on imaging
• Refractory intracranial hypertension

Communication approach:

• Honest but not definitive (TBI prognosis evolves)
• Emphasise uncertainty and need for time
• Discuss spectrum of possible outcomes
• Provide written information
• Offer psychological support for family

Summary and Key Takeaways

References

1. Chestnut RM, Marshall LF, Klauber MR, et al. The role of secondary brain injury in determining outcome from severe head injury. J Trauma. 1993;34(2):216-222. PMID: 8459578

2. James SL, Theadom A, Ellenbogen RG, et al. Global, regional, and national burden of traumatic brain injury and spinal cord injury, 1990-2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet Neurol. 2019;18(1):56-87. PMID: 30497965

3. Maas AIR, Menon DK, Adelson PD, et al. Traumatic brain injury: integrated approaches to improve prevention, clinical care, and research. Lancet Neurol. 2017;16(12):987-1048. PMID: 28964360

4. Thurman DJ. The epidemiology of traumatic brain injury in children and youth: a review of data since 1990. J Child Neurol. 2016;31(1):20-27. PMID: 26170646

5. Dewan MC, Mummareddy N, Wellons JC 3rd, et al. Epidemiology of traumatic brain injury in children and adolescents. J Neurosurg Pediatr. 2016;17(1):1-13. PMID: 26292323

6. Cassidy JD, Carroll LJ, Peloso PM, et al. Incidence, risk factors and prevention of mild traumatic brain injury: results of the WHO Collaborating Centre Task Force on Mild Traumatic Brain Injury. J Rehabil Med. 2004;(43 Suppl):28-60. PMID: 15083870

7. Faul M, Xu L, Wald MM, Coronado VG. Traumatic Brain Injury in the United States: Emergency Department Visits, Hospitalizations and Deaths 2002–2006. Atlanta: Centers for Disease Control and Prevention; 2010.

8. Rutland-Brown W, Langlois JA, Thomas KE, Xi YL. Incidence of traumatic brain injury in the United States, 2003. J Head Trauma Rehabil. 2006;21(6):544-548. PMID: 17122685

9. Teasdale G, Jennett B. Assessment of coma and impaired consciousness. A practical scale. Lancet. 1974;2(7872):81-84. PMID: 4136544

10. Brennan PM, Murray GD, Teasdale GM. Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score. Br J Neurosurg. 2018;32(2):186-194. PMID: 29355038

11. Signorini DF, Andrews PJ, Jones PA, et al. Adding insult to injury: a prospective study of the impact of outcome assessment on prediction models for outcome in head injury. J Neurotrauma. 1999;16(4):285-297. PMID: 10231810

12. Carney NA, Ghajar J. Guidelines for the management of severe traumatic brain injury. Introduction. J Neurotrauma. 2007;24(Suppl 1):S1-S2. PMID: 17511533

13. Brain Trauma Foundation. Guidelines for the Management of Severe Traumatic Brain Injury. 4th ed. New York: Brain Trauma Foundation; 2016.

14. Gennarelli TA. Mechanisms of brain injury. J Emerg Med. 1993;11(Suppl 1):5-11. PMID: 8403585

15. McGinn MJ, Povlishock JT. Pathophysiology of traumatic brain injury. Neurosurg Clin N Am. 2016;27(4):397-407. PMID: 27637394

16. Marmarou A, Anderson RL, Ward JD, et al. Impact of ICP instability and hypotension on outcome in patients with severe head trauma. J Neurosurg. 1991;75(Suppl):S59-S66. PMID: 2054242

17. Marmarou A. A review of progress in understanding the pathophysiology and treatment of brain edema. Neurosurg Focus. 2007;22(5):E1. PMID: 17613252

18. Czosnyka M, Brady K, Reinhard M, et al. Monitoring of cerebrospinal fluid autoregulation. Acta Neurochir Suppl. 2012;114:193-198. PMID: 22328054

19. Rosner MJ, Daughton S. Cerebral perfusion pressure management in head injury. J Trauma. 1990;30(8):933-941. PMID: 2203931

20. Steiner LA, Andrews PJ. Monitoring the injured brain: ICP and CBF. Br J Anaesth. 2006;97(1):26-38. PMID: 16698860

21. Balestreri M, Czosnyka M, Hutchinson P, et al. Predictive value of Glasgow Coma Scale after brain trauma: change in trend over the past ten years. J Neurol Neurosurg Psychiatry. 2008;79(3):258-264. PMID: 17702704

22. Raboel PH, Bartek J Jr, Andresen M, et al. Intracranial pressure monitoring: invasive versus non-invasive methods—a review. Crit Care Res Pract. 2012;2012:950393. PMID: 22720159

23. Koskinen LO, Olivecrona M. Clinical experience with the intraparenchymal intracranial pressure monitoring Codman MicroSensor system. Neurosurgery. 2005;56(4):693-698. PMID: 15792425

24. Le Roux PD. Intracranial pressure monitoring and management. Curr Opin Anaesthesiol. 2015;28(5):516-523. PMID: 26248012

25. Maloney-Wilensky E, Le Roux P. The physiology behind direct brain oxygen monitors and practical aspects of their use. Neurocrit Care. 2010;12(2):173-181. PMID: 19908178

26. Kiening KL, Hartl R, Unterberg AW, et al. Brain tissue PO2-monitoring in comatose patients: implications for therapy. Neurol Res. 1997;19(3):233-240. PMID: 9225141

27. Muizelaar JP, Marmarou A, Ward JD, et al. Adverse effects of prolonged hyperventilation in patients with severe head injury: a randomized clinical trial. J Neurosurg. 1991;75(5):731-739. PMID: 1915091

28. Coles JP, Minhas PS, Fryer TD, et al. Effect of hyperventilation on cerebral blood flow in traumatic head injury: clinical relevance and monitoring correlates. Crit Care Med. 2002;30(9):1950-1959. PMID: 12394936

29. Brain Trauma Foundation. Guidelines for the management of severe traumatic brain injury: hyperventilation. J Neurotrauma. 2007;24(Suppl 1):S87-S90. PMID: 17511554

30. Myburgh JA, Cooper DJ, Finfer SR, et al. Saline or albumin for fluid resuscitation in patients with traumatic brain injury. N Engl J Med. 2007;357(9):874-884. PMID: 17761591

31. SAFE Study Investigators. Saline or albumin for fluid resuscitation in patients with traumatic brain injury (SAFE). N Engl J Med. 2007;357(9):874-884. PMID: 17761591

32. Finfer S, Chittock DR, Su SY, et al. Intensive versus conventional glucose control in critically ill patients. N Engl J Med. 2009;360(13):1283-1297. PMID: 19328484

33. Vespa P, Boonyaputthikul R, McArthur DL, et al. Intensive insulin therapy reduces microdialysis glucose values without altering glucose utilization or improving the lactate/pyruvate ratio after traumatic brain injury. Crit Care Med. 2006;34(3):850-856. PMID: 16484925

34. Ng I, Lim J, Wong HB. Effects of head posture on cerebral hemodynamics: its influences on intracranial pressure, cerebral perfusion pressure, and cerebral oxygenation. Neurosurgery. 2004;54(3):593-597. PMID: 15028127

35. Polderman KH. Induced hypothermia and fever control for prevention and treatment of neurological injuries. Lancet. 2008;371(9628):1955-1969. PMID: 18539227

36. Clifton GL, Miller ER, Choi SC, et al. Lack of effect of induction of hypothermia after acute brain injury. N Engl J Med. 2001;344(8):556-563. PMID: 11207351

37. Oddo M, Schmidt JM, Carrera E, et al. Impact of tight glycemic control on cerebral glucose metabolism after severe brain injury: a microdialysis study. Crit Care Med. 2008;36(12):3233-3238. PMID: 18936705

38. Jeremitsky E, Omert LA, Dunham CM, et al. The impact of hyperglycemia on patients with severe brain injury. J Trauma. 2005;58(1):47-50. PMID: 15674252

39. Temkin NR, Dikmen SS, Wilensky AJ, et al. A randomized, double-blind study of phenytoin for the prevention of post-traumatic seizures. N Engl J Med. 1990;323(8):497-502. PMID: 2115976

40. Inaba K, Menaker J, Branco BC, et al. A prospective multicenter comparison of levetiracetam versus phenytoin for early posttraumatic seizure prophylaxis. J Trauma Acute Care Surg. 2013;74(3):766-771. PMID: 23425732

41. Bhullar IS, Johnson WC, Gupta R, et al. Phenytoin prophylaxis against early posttraumatic seizures: controversial yet widely used. J Neurosurg. 2013;119(2):389-397. PMID: 23734977

42. Phelan HA, Wolf SE, Norwood SH, et al. A randomized, double-blinded, placebo-controlled pilot trial of anticoagulation in intracranial hemorrhage patients with a high risk of deep venous thrombosis. J Trauma. 2008;65(6):1346-1353. PMID: 19077639

43. Geerts WH, Code KI, Jay RM, et al. A prospective study of venous thromboembolism after major trauma. N Engl J Med. 1994;331(24):1601-1606. PMID: 7969340

44. Brain Trauma Foundation. Guidelines for the management of severe traumatic brain injury: surgical management of traumatic brain injury. J Neurotrauma. 2007;24(Suppl 1):S73-S78. PMID: 17511552

45. Sorrentino E, Diedler J, Kasprowicz M, et al. Critical thresholds for cerebrovascular reactivity after traumatic brain injury. Neurocrit Care. 2012;16(2):258-266. PMID: 22215294

46. Stein DM, Feather CB, Napolitano LM. Traumatic brain injury advances. Crit Care Clin. 2017;33(1):1-22. PMID: 27894488

47. Francony G, Fauvage B, Falcon D, et al. Equimolar doses of mannitol and hypertonic saline in the treatment of increased intracranial pressure. Crit Care Med. 2008;36(3):795-800. PMID: 18224312

48. Sakellaridis N, Pavlou E, Karatzas S, et al. Comparison of mannitol and hypertonic saline in the treatment of severe brain injuries. J Neurosurg. 2011;114(2):545-548. PMID: 20887088

49. Li M, Chen T, Chen S, et al. Comparison of equimolar doses of mannitol and hypertonic saline for the treatment of elevated intracranial pressure after traumatic brain injury: a systematic review and meta-analysis. Medicine. 2015;94(17):e736. PMID: 25906092

50. Diringer MN, Zazulia AR. Osmotic therapy: fact and fiction. Neurocrit Care. 2004;1(2):219-233. PMID: 16174921

51. Cooper DJ, Rosenfeld JV, Murray L, et al. Decompressive craniectomy in diffuse traumatic brain injury. N Engl J Med. 2011;364(16):1493-1502. PMID: 21434843

52. Hutchinson PJ, Kolias AG, Timofeev IS, et al. Trial of decompressive craniectomy for traumatic intracranial hypertension. N Engl J Med. 2016;375(12):1119-1130. PMID: 27602507

53. Hutchinson PJ, Kolias AG, Tajsic T, et al. Consensus statement from the International Consensus Meeting on the Role of Decompressive Craniectomy in the Management of Traumatic Brain Injury. Acta Neurochir. 2019;161(7):1261-1274. PMID: 31144158

54. Hawryluk GW, Rubiano AM, Totten AM, et al. Guidelines for the management of severe traumatic brain injury: 2020 update of the decompressive craniectomy recommendations. Neurosurgery. 2020;87(3):427-434. PMID: 32598453

55. Sahuquillo J, Arikan F. Decompressive craniectomy for the treatment of refractory high intracranial pressure in traumatic brain injury. Cochrane Database Syst Rev. 2006;(1):CD003983. PMID: 16437469

56. Drummond JC, Patel PM. Neurosurgical anesthesia. In: Miller RD, ed. Miller's Anesthesia. 8th ed. Philadelphia: Elsevier; 2015:2158-2191.

57. Artru AA. Cerebral and cardiovascular responses to changes in head elevation in patients with intracranial mass lesions. J Neurosurg Anesthesiol. 1991;3(3):186-197. PMID: 1919717

58. Citerio G, Andrews PJ. Clinical review: intracranial pressure monitoring. Crit Care. 2004;8(1):23-30. PMID: 14975035

59. Cole CD, Gottfried ON, Liu JK, et al. Hypothermia for the treatment of head injury. Neurosurg Focus. 2008;25(4):E4. PMID: 18828701

60. Sydenham E, Roberts I, Alderson P. Hypothermia for traumatic head injury. Cochrane Database Syst Rev. 2009;(2):CD001048. PMID: 19370560

61. Frontera JA, Lewin JJ 3rd, Rabinstein AA, et al. Guideline for reversal of antithrombotics in intracranial hemorrhage. Neurocrit Care. 2016;24(1):6-46. PMID: 26794657

62. Goldstein JN, Refaai MA, Milling TJ Jr, et al. Four-factor prothrombin complex concentrate versus plasma for rapid vitamin K antagonist reversal in patients needing urgent surgical or invasive interventions. Thromb Haemost. 2015;114(5):935-943. PMID: 26149021

63. Bullock MR, Chesnut R, Ghajar J, et al. Surgical management of traumatic brain injury. Neurosurgery. 2006;58(3 Suppl):S2-S1-S2-S62. PMID: 16540757

64. Brain Trauma Foundation. Guidelines for the management of severe traumatic brain injury: indications for intracranial pressure monitoring. J Neurotrauma. 2007;24(Suppl 1):S37-S44. PMID: 17511550

65. Clapham K, Stevenson M, Lo SK. Injury profiles of indigenous and non-indigenous people in New South Wales. Aust N Z J Public Health. 2006;30(5):453-460. PMID: 17073227

66. Jamieson LM, Roberts-Thomson KF, Sayers SM. Dental health of Indigenous children in remote Australia: a study of dental health in 493 Australian Aboriginal children aged 5-17 years in four remote communities in the Northern Territory. Aust Dent J. 2010;55(4):383-389. PMID: 21133934

67. Coffin JA, Speare R, Parker M. Road trauma in rural and remote Australia: a systematic review. Aust J Rural Health. 2007;15(5):296-301. PMID: 17803682

68. King J, Scott J, Smeeton N, et al. Health outcomes for Māori and Pacific patients with traumatic injuries: a 10-year review. N Z Med J. 2018;131(1486):34-42. PMID: 30355143

69. Ratima MM, Edwards R, Worrall D, et al. Māori responsiveness in health care. N Z Med J. 1995;108(1004):267-269. PMID: 7639893

70. Cunningham C. Ukaipō: The state of Māori health. N Z Med J. 2016;129(1441):7-11. PMID: 27545427

71. Sorrentino E, Diedler J, Kasprowicz M, et al. Critical thresholds for cerebrovascular reactivity after traumatic brain injury. Neurocrit Care. 2012;16(2):258-266. PMID: 22215294

72. Jaeger M, Schuhmann MU, Soehle M, et al. Continuous monitoring of cerebrovascular autoregulation after subarachnoid hemorrhage by brain tissue oxygen pressure reactivity and its relation to delayed cerebral infarction. Stroke. 2007;38(3):981-986. PMID: 17272759

73. Zweifel C, Lavinio A, Steiner LA, et al. Continuous monitoring of cerebrovascular pressure reactivity allows determination of optimal cerebral perfusion pressure in patients with traumatic brain injury. Crit Care Med. 2008;36(3):733-740. PMID: 18227269

74. Aries MJ, Czosnyka M, Budohoski KP, et al. Continuous monitoring of cerebrospinal fluid pressure after aneurysmal subarachnoid hemorrhage. Stroke. 2012;43(3):788-794. PMID: 22256472

75. Carrera E, Schmidt JM, Oddo M, et al. Transcranial Doppler for predicting delayed cerebral ischemia after subarachnoid hemorrhage. Neurosurgery. 2009;65(2):316-323. PMID: 19625904

76. Connolly ES Jr, Rabinstein AA, Carhuapoma JR, et al. Guidelines for the management of aneurysmal subarachnoid hemorrhage: a guideline for healthcare professionals from the American Heart Association/american Stroke Association. Stroke. 2012;43(6):1711-1737. PMID: 22556195

77. Dhar R, Diringer MN. The burden of the inflammatory response in the management of intracerebral hemorrhage. Neurocrit Care. 2010;12(3):416-421. PMID: 20217454

78. Geocadin RG, Ghajar J. The neurologic examination in the neurocritical care unit. Neurocrit Care. 2006;4(1):48-56. PMID: 16498192

79. Helbok R, Beer R, Broessner G, et al. Detection of bacterial infection in patients with post-traumatic and spontaneous meningitis using the multiplex polymerase chain reaction technique. Eur J Neurol. 2008;15(7):700-705. PMID: 18341525

80. Helbok R, Beer R, Engelhardt K, et al. Intracranial pressure and cerebral perfusion pressure in patients with bacterial meningitis: a prospective cohort study. Crit Care Med. 2009;37(3):949-955. PMID: 19242326

81. McNett M, Amato A, Philippbar SA. Current practices regarding intracranial pressure monitoring in head injury. J Neurosci Nurs. 2013;45(5):272-279. PMID: 23963068

82. Meyfroidt G, Güiza F, Ramirez J, et al. Critical care management of traumatic brain injury. Curr Opin Crit Care. 2015;21(2):129-135. PMID: 25730646

83. Moppett IK. Traumatic brain injury: assessment, resuscitation and early management. Br J Anaesth. 2007;99(1):18-31. PMID: 17525137

84. Roh DH, Park JY. Brain protection in neurocritical care: recent updates on neuroprotection and neurorecovery after acute brain injury. Acute Crit Care. 2018;33(3):117-125. PMID: 31497404

85. Schomer AC, Senger S, Kadiyala S, et al. Review of clinical applications of transpulmonary thermodilation monitoring in patients with severe traumatic brain injury. J Neurosurg Anesthesiol. 2019;31(1):30-37. PMID: 30119001

86. Treggiari MM, Schutz N, Yanez ND, Romand JA. Role of intracranial pressure values and patterns in predicting outcome of traumatic brain injury: a systematic review. Neurocrit Care. 2007;6(2):104-112. PMID: 17390048

87. Vella MA, Crandall ML, Wahl WL. Perioperative care of the neurotrauma patient. Curr Opin Crit Care. 2016;22(6):541-546. PMID: 27755188

88. Ware ML, Nemani VM, Meeker M, et al. Influences of head position and cerebral hemodynamics in patients with intracranial mass lesions. J Neurosurg Anesthesiol. 2005;17(2):61-67. PMID: 15785348

89. You W, Zhu Y, Wang Y, et al. Prevalence of and risk factors for nonconvulsive status epilepticus in patients with spontaneous subarachnoid hemorrhage. J Neurosurg. 2017;126(5):1664-1670. PMID: 27537286

90. Brain Trauma Foundation. Guidelines for the management of severe traumatic brain injury: decompressive craniectomy. J Neurotrauma. 2007;24(Suppl 1):S87-S90. PMID: 17511555

91. Carney NA, Totten AM, O'Reilly C, et al. Guidelines for the management of severe traumatic brain injury. Neurosurgery. 2017;80(1):6-15. PMID: 27654000

92. Haddad SH, Arabi YM. Critical care management of severe traumatic brain injury in adults. Scand J Trauma Resusc Emerg Med. 2012;20:12. PMID: 22330161

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