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.