Management of Intracranial Pressure

Monitoring Methods

The American College of Surgeons recommends that intracranial pressure (ICP) be measured directly through invasive monitoring with intraventricular catheters or intraparenchymal probes, as this is the only precise method to determine ICP in clinical practice 1, 2
Intraparenchymal probes are generally preferred over intraventricular catheters due to their better risk-benefit profile 1, 2
Intraventricular catheters allow for drainage of cerebrospinal fluid and measurement of ICP, but have a higher complication rate (infection 10%, intracerebral hemorrhage 2-4%) 1, 2
Intraparenchymal probes have a lower complication rate (infection 2.5%, hemorrhage 0-1%), but do not allow for therapeutic drainage 1, 2

The Brain Injury Foundation recommends invasive ICP monitoring in patients with severe traumatic brain injury (Glasgow Coma Scale ≤8) with abnormal computed tomography (CT) scans or when neurological evaluation is not feasible 1, 2
Invasive ICP monitoring is indicated in patients with Glasgow Coma Scale ≤8 and abnormal CT scans 1, 2
Invasive ICP monitoring is also indicated in patients with normal CT scans but inability to perform adequate neurological evaluation 1, 2

The American Heart Association recommends maintaining ICP <20-25 mmHg 1, 2
ICP >20 mmHg is associated with a 3.95-fold increased risk of mortality and poor neurological outcome 1
ICP >40 mmHg increases the risk of mortality 6.9-fold 1
The cerebral perfusion pressure (CPP) should be calculated using the formula: CPP = mean arterial pressure (MAP) - ICP 5, 6
The recommended target for CPP is 60-70 mmHg 6, 1, 2

The European Society of Intensive Care Medicine recommends elevating the head of the bed to 30° to improve jugular venous drainage 5
Moderate hyperventilation (PaCO2 35-40 mmHg) is recommended as a first-line treatment for intracranial hypertension 6
Hyperosmolar therapy with mannitol or hypertonic saline is also recommended as a first-line treatment [[not included due to ignore ref]]
Barbiturate coma is recommended as a second-line treatment for refractory intracranial hypertension [[not included due to ignore ref]]
Hypothermia induced to 34°C is effective but has a high complication rate (pulmonary, infectious, coagulation, electrolyte) 5

The evidence on the benefit of ICP monitoring on patient outcomes has not been clearly demonstrated in controlled trials 2
Protocols focused on ICP monitoring and prevention of secondary insults are associated with significant reduction in mortality 3