Despite the massive use of intracranial pressure in neuro-resuscitation, there is still no cerebral compliance evaluation index used in current practice to guide therapy.

In treatment guidelines for intracranial hypertension, patients are placed in a prone position at about 30 degrees. Several times a day, during nursing care, patients are flattened, which corresponds to a cerebral compliance test by adding a volume of cerebrospinal fluid to the cranial box.

This study aims to analyse the shape of the different components of the intracranial pressure waves (P1, P2, and P3) when the patient is flattened to determine an index to define the level of cerebral compliance.

Inclusion Criteria:

• Continuous intracranial pressure monitoring
• Sedated patient on mechanical ventilation

Exclusion Criteria:

• Craniectomy
• Major hemodynamic failure

Sedated patient on mechanical ventilation with continuous intracranial pressure monitoring