Clinical trial NCT01685476: NIMI-NICU: Non Invasive Monitoring of the Intracranial Pressure - NeuroIntensive Care Unit
Official title: Validation of a New Non Invasive Method for Intracranial Pressure Monitoring
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE4
Conditions: Intracranial Pressure
Traumatic Brain Injury
Stroke
Intracranial Hemorrhages
Keywords: Cochlear microphonic potential
non invasive method
indirect monitoring
intracranial pressure
Lead sponsor: University Hospital, Clermont-Ferrand
Sponsor class: OTHER
Collaborators: name: Echodia SAS
First posted: 2012-09-14
Enrollment: 20
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP

Brief summary: In clinical practice, intracranial pressure (ICP) represents a key parameter for diagnosing and treating several conditions. Physicians having to manage cases of head trauma, stroke and hydrocephalus need to assess the time course of ICP, yet they are often unwilling to implement invasive monitoring beyond the acute stage, on account of high septic risks. Standard techniques include direct ventricular manometry or measurement in the parenchyma with electronic or fiberoptic devices. Therefore, the design of non-invasive clinical methods for gaining access to pressure changes is an important challenge. Fluctuations of ICP are transmitted to the fluid spaces of the inner ear through the cochlear aqueduct. The Biophysics Laboratory (School of Medicine of Clermont-Ferrand) described that the intra-labyrinthic pressure modify the functional activities of the outer hair cells in the cochlea. Thereby, increases in ICP are transferred to increases in intra-cochlear pressure, which is detected as modifications in cochlear activities. Cochlear activities' recording are non-invasive and technically simple. A probe is gently inserted into the outer portion of the external ear canal.

The objective of this study is to assess prospectively the accuracy and the precision of a new method for ICP monitoring (using cochlear activities) compared with invasive gold standard CSF pressure monitoring.

Detailed description: The purpose of this study is to examine the evolution of the electrophysiological cochlear activity (cochlear microphonic potential, CMP), with a non invasive method, during invasive ICP monitoring. The data analysis will determine relationship between ICP variations and CMP variations.

Continuous ICP monitoring has an important place in neuro-intensive care. ICP may be measured either within the ventricular cerebrospinal fluid or within the brain parenchyma.

The purpose of this study is to assess prospectively the accuracy and the precision of a new method for indirect ICP monitoring (using electrophysiological cochlear activity) compared with an invasive gold standard ICP monitoring. The data analysis will determine relationship between ICP variations and CMP variations.

Electrophysiological cochlear activities, so called electrocochleography (ECochG), are a non invasive and totally passive method used in routine in ENT department. The response measured in ECochG is the cochlear microphonic potential (CMP), generated by the outer hair cells following by presenting tone burst at 1kHz. CMP is recorded with the help of an Echodia® hand-held equipment.

Technically, a simple, non-invasive detection of ICP changes and ICP monitoring can be afforded by CMP recordings.

Eligibility criteria: Inclusion Criteria:

* Patients with intracranial pressure monitoring
* Age greater than 18
* consent form signed by a close relative (husband, wife, children, legal guardian),
* Patient covered under French social security or being a beneficiary of such a regime under the terms of the Act of August 9, 2004

Exclusion Criteria:

* Refusal by the close relative to sign a consent form
* Impossibility of electrophysiological measurements (pathophysiological reason)
* Technical troubles with the device
* Patient uncovered under French social security

Primary outcomes:
measure: Cochlear Microphonic Potential phase shift
timeFrame: acquisition every 5minutes during 4hours
Secondary outcomes:
measure: IntraCranialPressure variations
timeFrame: every minutes during 4 hours
Other outcomes:
Locations:
city: Clermont-Ferrand
country: France
facility: Chu Clermont Ferrand
Study officials:
affiliation: University Hospital, Clermont-Ferrand
name: Laurent SAKKA
role: PRINCIPAL_INVESTIGATOR
References:
citation: Giraudet F, Longeras F, Mulliez A, Thalamy A, Pereira B, Avan P, Sakka L. Noninvasive detection of alarming intracranial pressure changes by auditory monitoring in early management of brain injury: a prospective invasive versus noninvasive study. Crit Care. 2017 Feb 21;21(1):35. doi: 10.1186/s13054-017-1616-2.