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NIMI-NICU: Non Invasive Monitoring of the Intracranial Pressure - NeuroIntensive Care Unit (MINIPIC REA)

This study has been completed.
Echodia SAS
Information provided by (Responsible Party):
University Hospital, Clermont-Ferrand Identifier:
First received: August 31, 2012
Last updated: July 4, 2014
Last verified: July 2014

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.

Condition Intervention Phase
Intracranial Pressure Traumatic Brain Injury Stroke Intracranial Hemorrhages Device: Echodia® hand-held equipment Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Single Blind (Participant)
Official Title: Validation of a New Non Invasive Method for Intracranial Pressure Monitoring

Further study details as provided by University Hospital, Clermont-Ferrand:

Primary Outcome Measures:
  • Cochlear Microphonic Potential phase shift [ Time Frame: acquisition every 5minutes during 4hours ]

Secondary Outcome Measures:
  • IntraCranialPressure variations [ Time Frame: every minutes during 4 hours ]

Enrollment: 20
Study Start Date: January 2011
Study Completion Date: November 2012
Primary Completion Date: November 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Intracranial pressure Device: Echodia® hand-held equipment

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.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

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
  Contacts and Locations
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Please refer to this study by its identifier: NCT01685476

Chu Clermont Ferrand
Clermont-Ferrand, France, 63003
Sponsors and Collaborators
University Hospital, Clermont-Ferrand
Echodia SAS
Principal Investigator: Laurent SAKKA University Hospital, Clermont-Ferrand
  More Information

Responsible Party: University Hospital, Clermont-Ferrand Identifier: NCT01685476     History of Changes
Other Study ID Numbers: CHU-0124
Study First Received: August 31, 2012
Last Updated: July 4, 2014

Keywords provided by University Hospital, Clermont-Ferrand:
Cochlear microphonic potential
non invasive method
indirect monitoring
intracranial pressure

Additional relevant MeSH terms:
Brain Injuries
Intracranial Hemorrhages
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Craniocerebral Trauma
Trauma, Nervous System
Wounds and Injuries
Pathologic Processes
Cerebrovascular Disorders
Vascular Diseases
Cardiovascular Diseases processed this record on June 23, 2017