- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04161261
Minimizing Facial Nerve Stimulation in Cochlear Implants
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Study Type
Enrollment (Anticipated)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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-
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Cambridge, United Kingdom
- Addenbrookes Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
Participant is willing and able to give informed consent for participation in the study.
- Male or Female, aged 18 years or above.
- Unilateral user of a cochlear implant or at least 6 months (post-operative group), or prospective CI user, meeting NICE criteria for implantation (intra-operative group).
- First language English or sufficiently fluent in English to understand the consenting process
- Post-lingual onset of severe to profound hearing loss
- No other handicaps that would interfere with participation in the study in the opinion of the Principal Investigator
Exclusion Criteria:
Unstable cochlear implant or hearing aid fitting
- Using medication in an intermittent manner that might influence hearing levels
- Cognitive or psychological challenges that might lead to variations in attention
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: Non-Randomized
- Interventional Model: Sequential Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: IntraOperative Group
The intra-operative group consists of patients who have met criteria for cochlear implants.
We monitor the facial nerve EMG intraoperatively in all patients, and often get some facial nerve activation when we are testing the implant intraoperatively when we are looking to see if we are getting any hearing nerve responses from electrical stimulation of the implant.
We will also measure the facial nerve responses for some other charge-balanced pulse shapes, which are asymmetric and in which either the positive or negative charge is expected to stimulate the nerve.
We will only measure these for two electrodes, not for all 12-22 electrodes They will be then invited back post operatively for a second testing during a standard of care visit post switch on for other pulse shapes.
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To measure the facial nerve stimulation threshold for one mid-array and one apical electrode of the implant using the pulse-train stimuli
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Experimental: PostOperative Group
The post-operative group, are patients who are actually having facial nerve stimulation on one or more electrodes, and for whom these electrodes are turned down so much they can't hear very well, or are actually turned off because of the facial nerve stimulation.
For these patients, we will slowly increase the current levels on the offending electrodes (maximum of two) until they get some facial nerve twitching, and then turn down the current until they do not have stimulation any more.
We will do this for all pulse shapes and determine which shape produces the greatest loudness without stimulating the facial nerve.
This will be the only testing session for the second group.
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To measure the facial nerve stimulation threshold for one mid-array and one apical electrode of the implant using the pulse-train stimuli
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
To identify stimulus parameters for cochlear implant stimulation that achieve sufficient loudness for hearing, while minimizing stimulation of the facial nerve.
Time Frame: 18 months
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The loudness level, or auditory nerve response at which facial nerve stimulation occurs for different stimulation pulse shapes will be measured for all 24 patients on both groups and help to identify different optimal stimulus parameters. By comparing the amount of electrical current required to initiate a facial nerve response for each pulse shape this will determine if there is an optimal type of stimulation to use, to reduce facial nerve stimulation. |
18 months
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
To increase scientific understanding of the biology of the auditory and facial nerve's responses to stimulation.
Time Frame: 18 months
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This is a hugely under researched field where we are pioneering techniques and so exact outcome measures may be difficult to quantify in this scientific investigation. We are not able to use questionnaires or scientific tools at this stage, however this can be measured through electrical current measurements on the volta software for the Advanced Bionics cochlear implant company. |
18 months
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Collaborators and Investigators
Investigators
- Principal Investigator: Manohar L Bance, Professor, Cambridge University Hospitals NHS Foundation Trust
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Pathologic Processes
- Nervous System Diseases
- Neurologic Manifestations
- Wounds and Injuries
- Disease Attributes
- Stomatognathic Diseases
- Otorhinolaryngologic Diseases
- Mouth Diseases
- Ear Diseases
- Craniocerebral Trauma
- Trauma, Nervous System
- Cranial Nerve Diseases
- Sensation Disorders
- Hearing Disorders
- Facial Nerve Diseases
- Cranial Nerve Injuries
- Hearing Loss
- Deafness
- Hearing Loss, Sensorineural
- Facies
- Facial Nerve Injuries
Other Study ID Numbers
- 272538
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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