This trial is active, not recruiting.

Condition single-sided deafness
Treatment med-el maestro cochlear implant
Sponsor Robert Shannon
Collaborator Med-El Corporation
Start date September 2014
End date June 2019
Trial size 10 participants
Trial identifier NCT02259192, CI for SSD adults


The purpose of this investigation is to determine the safety and preliminary efficacy of implanting a cochlear implant (CI) in the profoundly deaf ear of an adult with one normal hearing (NH) ear (termed "single-sided deaf" person, or SSD). The potential subjects will have been deafened post-lingually, thus, at one point the now deafened ear did conduct sound from the periphery. The MED-EL CI system will be implanted in ten (10) SSD patients.The long-term goal of this research program is to determine whether the CI, in combination with the NH ear, may provide improved localization ability and better speech understanding in noise, relative to performance before cochlear implantation (i.e., with the NH ear alone). A secondary long-term goal is to determine whether CI stimulation may reduce tinnitus severity, compared to tinnitus experienced prior to cochlear implantation or when the CI is turned off, after implantation.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Intervention model single group assignment
Primary purpose device feasibility
Masking no masking
Cochlear Implant
med-el maestro cochlear implant
cochlear implant

Primary Outcomes

Pure-tone threshold average (dB)
time frame: 6 months post-activation
Hearing in Noise Test (signal-to-noise ratio)
time frame: 6 months post-activation

Secondary Outcomes

Adverse Events
time frame: 1-month post-implantation

Eligibility Criteria

All participants at least 18 years old.

Inclusion Criteria: - Is an adult (18 years of age or older) - English as the primary language - Able to undergo general anesthesia, as determined by physical examination and written report from the physician - Receives pneumovax vaccine within 2 weeks of surgery and provides documentation to the principal investigator - Profoundly/severely deaf in one ear ("implant ear"), as defined by: - 3-frequency pure-tone average≥70 dB Hearing Loss - Bone conduction thresholds consistent with air conduction thresholds (i.e., no conductive component to the hearing loss) - HINT sentence recognition score ≤40% correct, 60 dBA presentation level - Post-lingual onset of hearing loss, i.e., after age 6 years of age - Hearing loss occurred <10 years prior, as obtained by history - Normal hearing in one ear ("non-implant ear"), as defined by: - 3-frequency PTA ≤25 dB HL - No tested frequency air conduction threshold >35 dB HL - Bone conduction thresholds consistent with air conduction thresholds - Word recognition score ≥80% correct, 60 dBA presentation level - HINT sentence recognition score ≥ 80%, 60 dBA presentation level - Provides informed consent - Willing and able to follow the study protocol Exclusion Criteria: - Retrocochlear pathology resulting from Neurofibromatosis 2, or other types of cranial nerve/brainstem tumors - Co-existing medical conditions that require radiotherapy of the brainstem and/or auditory cortex - Any medical contraindication precluding safe administration of general anesthesia, e.g., - Cardiopulmonary disease - Renal disease - Otologic conditions which contraindicate surgery - Active middle ear infection - Tympanic membrane perforation - Anatomic abnormalities detected on CT preventing appropriate placement of the stimulator housing in the bone of the skull or placement of the electrode array in the cochlea (e.g., ossification) - Psychological conditions contraindicating surgery - Skin or scalp conditions that may preclude attachment of the coil or that may interfere with the use of the coil - Chronic pain in or around the head - Current or previous use of an active hearing implant (e.g., bone-anchored hearing aids, cochlear implant, etc.) - Developmental delays or organic brain dysfunction

Additional Information

Official title Cochlear Implantation for Single-Sided Deafness
Principal investigator Robert Shannon, PhD
Trial information was received from ClinicalTrials.gov and was last updated in April 2017.
Information provided to ClinicalTrials.gov by University of Southern California.