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Promontory stimulation following labyrinthectomy: implications for cochlear implantation
J M Kartush1, C J Linstrom, M D Graham
1Michigan Ear Institute, Farmington Hills 48331.
The Laryngoscope
|January 1, 1990
Summary
Transtympanic electric promontory stimulation can assess hearing in patients after labyrinthectomy. This test suggests cochlear implantation is feasible even after labyrinthectomy, offering hope for hearing restoration.
Area of Science:
- Otolaryngology
- Neuroscience
- Audiology
Background:
- Profound sensorineural hearing loss often necessitates advanced auditory interventions.
- Labyrinthectomy, a surgical procedure, can be a precursor to auditory prosthetics.
- Assessing residual neural function post-labyrinthectomy is crucial for managing hearing loss.
Purpose of the Study:
- To evaluate the feasibility of cochlear implantation after labyrinthectomy.
- To determine if transtympanic electric promontory stimulation can assess auditory neurons post-surgery.
- To compare electrophysiological responses with pre-operative data from cochlear implant candidates.
Main Methods:
- Transtympanic electric promontory stimulation was performed on six patients post-labyrinthectomy.
- Patients had varying conditions including Meniere's disease and labyrinthitis.
- Psychoacoustic testing included threshold, dynamic range, and difference limen measurements.
Main Results:
- All patients reported auditory sensations during stimulation of the labyrinthectomized ear.
- Test results were comparable to pre-operative data from successful cochlear implant users.
- No degradation in responses was observed with increased time post-labyrinthectomy.
Conclusions:
- Transtympanic electric promontory stimulation indicates viable auditory pathways after labyrinthectomy.
- Successful cochlear implantation may be possible in patients who have undergone labyrinthectomy.
- Histological data support the potential for successful auditory rehabilitation post-surgery.