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NIMIP: Non Invasive Measurement of the Intracranial Pressure (MINIPIC)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01685450
Recruitment Status : Unknown
Verified September 2012 by University Hospital, Clermont-Ferrand.
Recruitment status was:  Recruiting
First Posted : September 14, 2012
Last Update Posted : September 14, 2012
Echodia SAS
Information provided by (Responsible Party):
University Hospital, Clermont-Ferrand

Brief Summary:

The intracranial pressure (ICP), defined by the hydrostatic pressure of the cerebrospinal fluid (CSF), is a key parameter for diagnosing and treating several neurosurgical diseases. Continuous ICP monitoring has an important place in neuro-intensive care for patients with severe head trauma and severe meningeal hemorrhage.

Until now the assessment of ICP requires invasive methods, with a pressure transducer either within the ventricular CSF or within the brain parenchyma. The pressure sensor placement is performed in a neurosurgery department. These invasive methods have also disadvantages: highest risk of infections, catheter misplaced, and risk of bleeding. All these justify the development of a non invasive method. The Biophysics Laboratory (School of Medicine of Clermont-Ferrand) described that the intra-labyrinthic pressure (ILP) modify the functional activities of the outer hair cells in the cochlea.

Cochlear activities' recording is non-invasive and technically simple. A probe is gently inserted into the outer portion of the external ear canal.

Anatomical studies showed communication between the subarachnoid spaces and the perilymphatic compartment by the cochlear aqueduct. Thereby, increases in ICP are transferred to increases in intra-cochlear pressure, which is detected as modifications in cochlear activities.

CSF dynamic tests, as constant flow infusion test, are conducted in patients in the diagnosis of the idiopathic adult hydrocephalus syndrome. Artificial CSF is infused through a lumbar needle, into the CSF space at a constant rate, and the corresponding rise in ICP is registered and analyzed.

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

Condition or disease Intervention/treatment Phase
Chronic Hydrocephalus Device: Echodia® hand-held equipment Phase 4

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.

Patients, from the neurosurgery department, investigated for 'normal pressure' chronic hydrocephalus are involved in CSF dynamic test. This complex protocol, including infusion test and invasive CSF monitoring, is needed in order to confirm the diagnosis. CSF dynamic tests, a socalled 'perfusion test', are performed in an operating theater, the patient had to be awake but sedated. During perfusion test, electrophysiological cochlear activities are measured with a gold tiptrode (Etymotic Research, Elk Grove Village, Ill) gently inserted into the ear canal.

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.

Previously animal studies have shown that the phase of CM is sensitive to ICP changes and CM phase shifts exhibit the same time course as those of otoacoustic emissions (DPOAEs).

The phase changes of CM can indeed be used as a non-invasive tool for monitoring intralabyrinthine and intracranial pressures.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 25 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: Single (Participant)
Official Title: Validation of a New Non Invasive Method of Indirect Measurement of the Intracranial Pressure Variations
Study Start Date : June 2010
Estimated Primary Completion Date : September 2012
Estimated Study Completion Date : September 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Hydrocephalus

Arm Intervention/treatment
Intracranial pressure Device: Echodia® hand-held equipment

Primary Outcome Measures :
  1. Cochlear Microphonic Potential [ Time Frame: acquisition every minutes during "Cerebrospinal Fluid Dynamic Test time(30-45min) ]

Secondary Outcome Measures :
  1. IntraCranialPressure Variations [ Time Frame: every minutes during CerebroSpinal Fluid dynamic test time (30-45min) ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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

Inclusion Criteria:

  • Patients with suspected chronic hydrocephalus, undergoing a CSF dynamic test (perfusion test)
  • Age greater than 18
  • Subject provides written informed consent, or 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 to sign a consent form

    • under otoscopy, presence of obstruction of the ear canal with wax (cerumen).
    • Impossibility of electrophysiological measurements (pathophysiological reason)
    • Technical troubles with the device
    • Patient uncovered under French social security

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01685450

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Contact: Patrick LACARIN 04 73 75 11 95

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Chu Clermont Ferrand Recruiting
Clermont-Ferrand, France, 63003
Contact: Patrick LACARIN    04 73 75 11 95   
Sponsors and Collaborators
University Hospital, Clermont-Ferrand
Echodia SAS
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Principal Investigator: Laurent SAKKA University Hospital, Clermont-Ferrand
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Responsible Party: University Hospital, Clermont-Ferrand Identifier: NCT01685450    
Other Study ID Numbers: CHU 0123
First Posted: September 14, 2012    Key Record Dates
Last Update Posted: September 14, 2012
Last Verified: September 2012
Keywords provided by University Hospital, Clermont-Ferrand:
Cochlear microphonic potential
non invasive method
indirect measurement
intracranial pressure
Additional relevant MeSH terms:
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Brain Diseases
Central Nervous System Diseases
Nervous System Diseases