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°.
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Volume of the ear canal as a function of intracranial pressure
Timeframe: Approximately on the 10th day
Width between conductance peaks of tympanometry at 2kHz as a function of intracranial pressure
Timeframe: Approximately on the 10th day
Middle ear resonance frequency as a function of intracranial pressure
Timeframe: Approximately on the 10th day