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Refractory Intracranial Pressure in Traumatic Brain Injury: Tiered Escalation Algorithm

Escalation pathway when ICP remains >20 mmHg despite sedation, ventilation, head position, and osmotherapy.

Refractory ICP in TBI = sustained ICP >20 mmHg despite tier-1 interventions — escalate through tier-2 osmotherapy, optimize MAP/CPP, control fever/seizures/glucose, and proceed to surgical decompression, while preventing secondary injury from hypotension and hypoxemia.

If you forget

Refractory ICP — ICP >20 mmHg sustained >5 min despite tier-1: HOB 30°, head midline, sedation, PaCO2 35-40, normothermia, euvolemia

Board trap

Examiner: 'After pentobarbital coma your patient's ICP is 12 but MAP is 65 on norepinephrine and UO drops to 0.2 mL/kg/h. The nurse asks if the pentobarb is failing. What do you do?' Answer: Recognize barbiturate-induced myocardial depression and renal hypoperfusion driving oliguria — pentobarbital masks the neuro exam, so do NOT stop the drip to 'wake up' the patient; instead add fluid/inotropic support to restore CPP and confirm the source is MAP, not ICP, that has crashed.

Key numbers

ICP target <20 mmHg; treat sustained >22 mmHg for >5 min
CPP goal 60-70 mmHg; avoid >70 (ARDS risk)
SBP floor 90 mmHg in adults; SpO2 floor 94-97%
PaCO2 target 35-40 mmHg; never <30 except 5-10 min herniation bridge
Hypertonic saline 3% 150-250 mL bolus; goal serum Na 145-160 mEq/L
Mannitol 0.25-1 g/kg over 5-10 min; hold if SBP <90 or osm >320 mOsm/kg
Pentobarbital load 10 mg/kg, then 1-3 mg/kg/h to burst-suppression on EEG

Reviewed Sep 15, 2026 for clinical accuracy by BoardsBridge Editorial Process

Uri Rozen, MD — Licensed Physician, Israel

Source guidelines: ACS TQP TBI Best Practices 2024 · SNACC Neuroanesthetic Emergencies 2020

Re-review cadence: 12 months from reviewed date.

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Card ID: refractory-icp · Path: aba.neuro.traumatic-brain-injury.refractory-icp