Assessment and Management of Intracranial Pressure

Direct Measurement and Monitoring

The American College of Cardiology and other guideline societies recommend that intracranial pressure (ICP) cannot be reliably estimated from clinical features or CT findings alone and must be directly measured using invasive monitoring devices 1
Intraventricular catheters (external ventricular drains) are the preferred method for measuring ICP as they allow for both measurement and therapeutic CSF drainage 2
Intraparenchymal fiberoptic monitors provide continuous ICP readings and are typically used when there is a high suspicion of elevated ICP or in clinically deteriorating patients 2

Place ICP monitors in patients with a Glasgow Coma Scale (GCS) ≤8 and abnormal CT scan findings, as recommended by the Brain Injury Foundation 1
Additional indications for invasive ICP monitoring include signs of high ICP on brain CT scan, such as compression or absence of basal cisterns, disappearance of ventricles, midline shift >5 mm, or hematoma >25 mL 1

CT imaging findings, such as compression or absence of basal cisterns, disappearance of cerebral ventricles, midline shift >5 mm, or intracerebral hematoma volume >25 mL, can indicate elevated ICP 1
Transcranial Doppler sonography provides non-invasive assessment of mass effect and ICP changes through waveform analysis, with decreased diastolic velocity and increased pulsatility index indicating elevated ICP 2

Assess neurological status frequently using standardized scales, such as the National Institutes of Health Stroke Scale (NIHSS) for stroke patients or the Glasgow Coma Scale (GCS) for level of consciousness 2 3
Monitor cardiopulmonary status, including automated blood pressure cuff, continuous arterial pressure monitoring, and pulse oximetry, to minimize secondary injury in patients with impaired autoregulation 2

ICP 20-40 mmHg increases mortality risk 3.95-fold, while ICP >40 mmHg increases mortality risk 6.9-fold 1 3
Maintain cerebral perfusion pressure (CPP) 60-70 mmHg in adults without multimodal monitoring, as recommended by the Neurocritical Care Society 3

Repeated neurological examinations are mandated by TBI management guidelines to detect secondary neurological deterioration during the initial care phase. [4][5]
In intubated patients, the motor response (e.g., a score of 3) is the most reliable indicator of injury severity and correlates with outcome. 4
A decline of ≥ 2 points in the Glasgow Coma Scale should prompt an immediate head CT before any further interventions. [4][5]
The current GCS components (eye, motor, verbal/intubated status) must be documented as a baseline prior to invasive monitoring. 4
Focal neurological deficits should be assessed during the initial examination. 5

Coagulation status must be verified and any coagulopathy corrected before placing an invasive ICP device. 6
Hemodynamic instability must be addressed and stabilized before proceeding with monitoring. [4][5]

The head of the bed should be elevated to approximately 30° to promote venous drainage and aid ICP control. 6
Adequate sedation and analgesia are required to prevent ICP spikes during monitor insertion and maintenance. 6

Mean arterial pressure should be maintained at ≥ 80 mm Hg to ensure sufficient cerebral perfusion. [4][5]
Oxygen saturation must be kept above 90 % (SaO₂ > 90 %) because hypoxemia markedly worsens outcomes. [4][5]

ICP monitoring must not be initiated without a current neurological assessment; acute deterioration may necessitate emergent imaging or surgical intervention. [4][5]
Even brief episodes of hypotension (systolic BP < 90 mm Hg for > 5 minutes) significantly increase mortality and should be avoided during preparation. [4][5]