Management of Traumatic Brain Injury in the ICU

Initial Assessment and Severity Classification

The American College of Surgeons recommends classifying TBI severity using the Glasgow Coma Scale (GCS): severe TBI is GCS ≤8, moderate TBI is GCS 9-13, and mild TBI is GCS 14-15 1, 2, 3
Serial neurological examinations should be performed to detect secondary deterioration—the motor component remains the most robust indicator in sedated patients 1
A non-contrast CT scan should be obtained immediately for all moderate to severe TBI patients to identify mass lesions, hemorrhage, midline shift, and signs of elevated intracranial pressure 1, 2
Repeat CT scanning is mandatory if there is neurological deterioration (decrease of ≥2 points in GCS) or new focal deficits 1, 2

Arterial hypotension and hypoxemia are the most critical preventable causes of secondary brain injury and must be aggressively corrected 1
The Brain Trauma Foundation recommends maintaining mean arterial pressure ≥80 mmHg in severe TBI patients to ensure adequate cerebral perfusion 1
Systolic blood pressure <90 mmHg for even 5 minutes significantly increases mortality and poor neurological outcomes 1
The American College of Surgeons recommends never using permissive hypotension strategies in TBI patients, even with concomitant hemorrhagic injuries, as arterial hypotension exacerbates cerebral secondary damage 3

ICP monitoring is strongly indicated in severe TBI patients (GCS ≤8) with abnormal CT findings, as more than 50% will develop intracranial hypertension 6, 7, 2, 3, 4
The Brain Trauma Foundation recommends maintaining cerebral perfusion pressure (CPP) ≥60 mmHg when ICP monitoring is available 2, 3, 4
ICP of 20-40 mmHg increases mortality risk 3.95-fold, while ICP >40 mmHg increases mortality risk 6.9-fold 6, 7, 2, 3, 4

The American College of Surgeons recommends elevating the head of bed to 20-30 degrees to facilitate venous drainage and minimize edema 2, 4
Osmotherapy with hypertonic saline or mannitol should be used for persistent intracranial hypertension despite first-tier measures 2, 3, 4
External ventricular drainage (EVD) can be performed to drain cerebrospinal fluid, even from small ventricles, and may dramatically reduce ICP with removal of small CSF volumes 5
Decompressive craniectomy should be considered for refractory intracranial hypertension in a multidisciplinary discussion, recognizing it reduces mortality but may increase severe disability 6, 7, 5

Immediate neurosurgical consultation is required for symptomatic epidural hematoma, acute subdural hematoma with thickness >5mm and midline shift >5mm, acute hydrocephalus requiring drainage, open displaced skull fracture requiring closure, and closed displaced skull fracture with brain compression (thickness >5mm, midline shift >5mm) 5

The American College of Surgeons recommends maintaining platelet count >50,000/mm³ for life-threatening hemorrhage and higher thresholds for neurosurgical interventions 3, 4
Keep PT/aPTT <1.5 times normal control during interventions 3, 4
Utilize point-of-care coagulation tests (TEG, ROTEM) when available to guide management 3, 4

In patients with both TBI and life-threatening extracranial hemorrhage, prioritize maintaining adequate cerebral perfusion pressure while controlling hemorrhage—never accept hypotension 3, 4
Establish protocols for simultaneous multisystem surgery when both neurosurgical intervention and hemorrhage control are urgently needed 4
Balance aggressive resuscitation with avoidance of hypo-osmolar fluids that worsen cerebral edema 3, 4

Transcranial Doppler (TCD) can estimate cerebral perfusion through pulsatility index calculation—mean flow velocity <28 cm/s or combination of low velocity and high pulsatility index predicts higher mortality 1

Corticosteroids have no role in TBI management and are not recommended for ICP control 4
Avoid routine repeat CT scanning in mild TBI with initially normal CT 2
Do not use prophylactic hyperventilation—reserve for acute herniation only 1, 5, 4
Recognize that hypoxemia combined with hypotension carries 75% mortality 1