Bimodal, CROS and Severe Profound Hearing Loss Study

June 30, 2021 updated by: James Tysome, Cambridge University Hospitals NHS Foundation Trust

Clinical Evaluation of Outcomes With Hearing Aid Parameters Designed for Adults With Severe-profound Hearing Loss and Unilateral Cochlear Implants in Bimodal (Cochlear Implant and Contralateral Hearing Instrument), CROS (Contralateral Routing of Signals) and Bilateral Amplification Strategies

The study will involve the comparison of three groups with severe-profound hearing loss. Patients with a Cochlear Implant only, patients with a cochlear implant and Hearing Aid, and finally patients with two hearing aids.

This will enable a comparison of standard fitting protocols against the new rationale using the same devices. Devices used for patients in all 3 groups are now available in standard of care, and can be kept afterwards should the patients wish.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The study will involve three groups of 20 patients per group. This first is experienced adult bimodal users of the AB system who have usable contralateral residual hearing. A clinical baseline and three research conditions will be evaluated.

The Naida CI Link HA (Link) will be fitted, tested and then optimised using a special bimodal fitting formula. Subjects will be allowed three months to acclimatize and will then be retested. The second research condition will evaluate the fully integrated bimodal system, where the microphone signals from CI and HA are shared and a bilateral beamformer is formed. A third intervention will involve modifying the CI settings to minimize the mis-match between frequencies delivered via the CI.

A second group with no aidable hearing on their non-implanted ear will also be studied. A contralateral routing of signal (CROS) device will send sounds on the non-implanted side. Tests will be made with and without CROS, as well as with directional microphone settings.

Finally as a control group, bilateral HA users will be tested with the similar HA fitting as used for the bimodal group.

This will enable a comparison of standard fitting protocols against the new rationale using the same devices.

Study Type

Interventional

Enrollment (Actual)

30

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United Kingdom
      • Cambridge, United Kingdom, CB2 OQQ
        • Addenbrooke's Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

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.
  • Consistent unilateral user of an Advanced Bionics cochlear implant and a contralateral hearing aid for at least 6 months, ideally 12 months, and Bilateral severe to profound hearing loss (meeting NICE criteria for implantation-2009). (group 1)
  • Consistent unilateral user of an Advanced Bionics cochlear implant for at least 6 months and ideally 12 months, with no useful contralateral hearing (group 2)
  • Consistent user of bilateral hearing aids for at least six months (group 3) and bilateral severe profound hearing loss (80dB or worse at 2000 and 4000 Hz with speech discrimination of at least 50% IHR sentences live voice at 60dBA)
  • First language English
  • 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 Principle 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

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: Cochlear Implant and Hearing Aid
Comparing performance of conventional hearing aid fitting to Phonak's Bimodal Fitting formula using the Phonak Naida Link hearing aid. All patients are tested in a bimodal (hearing aid plus cochlear implant) setup. Initial tests are completed with the Advanced Bionics Naida Q70 or Q90 sound processor and the patient's own hearing aid. In this arm, a patient's own hearing aid is replaced with the Phonak Naida Link hearing aid to test if there is a benefit.
Device: Fitting strategy of cohlear implant of hearing aid
To determine whether new hardware and fitting strategy provides better sound quality or ease of use than generic hardware and fitting methods
Other: Cochlear Implant alone
To determine if the addition of a contralateral routing of signal (CROS) microphone on the un-implanted ear improves performance. Baseline tests are completed with Advanced Bionics Naida Q70 or Q90 sound processors. Patients are then given the Phonak Naida Link CROS aid to test if there is a benefit.
Device: Fitting strategy of cohlear implant of hearing aid
To determine whether new hardware and fitting strategy provides better sound quality or ease of use than generic hardware and fitting methods
Other: Hearing Aid and Hearing Aid
Comparing performance of conventional hearing aid fitting to a modified signal processing strategy more aligned with how a cochlear implant manages sound. All patients are tested initially with their own hearing aids to obtain a baseline measurement. Patients are then fitted with a modified Phonak hearing aid to determine if performance improves.
Device: Fitting strategy of cohlear implant of hearing aid
To determine whether new hardware and fitting strategy provides better sound quality or ease of use than generic hardware and fitting methods

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Sound Processing parameters
Time Frame: 24 months
ASSE score
24 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Cambridge University Hospitals NHS Foundation Trust

Collaborators

Advanced Bionics AG

Investigators

  • Principal Investigator: James R Tysome, Cambridge University Hospitals NHS Foundation Trust

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

September 4, 2018

Primary Completion (Actual)

March 1, 2021

Study Completion (Actual)

March 1, 2021

Study Registration Dates

First Submitted

January 23, 2019

First Submitted That Met QC Criteria

January 7, 2020

First Posted (Actual)

January 9, 2020

Study Record Updates

Last Update Posted (Actual)

July 2, 2021

Last Update Submitted That Met QC Criteria

June 30, 2021

Last Verified

June 1, 2021

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 18/EE/0160

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

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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