Intracranial pressure is usually measured by invasive methods requiring an intracranial sensor. There is no non-invasive monitoring method recognized as a gold standard. Tympanometry would make it feasible to evaluate intracranial pressure through sensitive and specific changes in the energy absorbance of the middle ear. It could represent a non-invasive method of monitoring intracranial pressure.

This is a prospective monocentric longitudinal study. All adult patients in intensive care for head trauma, intracranial hypertension, or after cranial surgery and requiring invasive monitoring of ICP will be included after their non-opposition has been collected.

In a group of 10 controls, multifrequency tympanometry will be performed in the standing position, in the 0° supine position and in the Tredelenburg position at -17°.

Inclusion Criteria:

Patients:

• Person who did not oppose to their inclusion in the trial
• Head trauma, patient operated on for an intracranial lesion, or other condition (hemorrhagic stroke...) requiring monitoring of ICP by a subdural or epidural sensor.
• Age > 18 years old

Controls:

• Person who did not oppose to their inclusion in the trial
• Age > 18 years old
• No otologic or neurological history.

Exclusion Criteria:

• Person subject to a measure of legal protection (curatorship, guardianship)
• Person under judicial control
• Pregnant, parturient or breastfeeding woman
• Minor
• Fracture of the petrosal bone, abnormality of the bilateral middle or inner ear or canal preventing tympanometry

Head trauma patient operated on for an intracranial lesion or other condition (hemorrhagic stroke)