Cochlear Implantation for Single-Sided Deafness
Overview
- Phase
- N/A
- Intervention
- Not specified
- Conditions
- Single-sided Deafness
- Sponsor
- Robert Shannon
- Enrollment
- 10
- Locations
- 2
- Primary Endpoint
- Pure-tone threshold average (dB)
- Last Updated
- 9 years ago
Overview
Brief Summary
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.
Investigators
Robert Shannon
Professor of Research, Otolaryngology - Head and Neck Surgery
University of Southern California
Eligibility Criteria
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
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
Outcomes
Primary Outcomes
Pure-tone threshold average (dB)
Time Frame: 6 months post-activation
Change in 3-frequency pure-tone threshold average (dB) in the normal hearing ear.
Hearing in Noise Test (signal-to-noise ratio)
Time Frame: 6 months post-activation
Change in Hearing in Noise Test signal-to-noise ratio in the normal hearing ear.
Secondary Outcomes
- Adverse Events(1-month post-implantation)