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Promontory electrical stimulation in labyrinthectomized ears
P R Lambert1, R A Ruth, C F Halpin
1Department of Otolaryngology-Head and Neck Surgery, University of Virginia Health Sciences Center, Charlottesville 22908.
Archives of Otolaryngology--Head & Neck Surgery
|February 1, 1990
Summary
Cochlear implants may be feasible in patients with Menière
Area of Science:
- Otolaryngology
- Neuroscience
- Audiology
Background:
- Menière's disease can lead to bilateral deafness.
- Unilateral labyrinthectomy is a treatment for Menière's disease.
- Feasibility of cochlear implantation in labyrinthectomized ears is unclear.
Purpose of the Study:
- To assess the feasibility of cochlear implantation in patients with prior unilateral labyrinthectomy.
- To evaluate the function of auditory pathways after labyrinthectomy.
Main Methods:
- Promontory electrical testing using transtympanic needle stimulation.
- Tested six patients with unilateral transmastoid labyrinthectomy (6 weeks to 5 years prior).
- Assessed behavioral responses and electrically evoked middle latency responses.
Main Results:
- All patients exhibited behavioral responses to electrical stimulation.
- Patients perceived different pitches across four frequencies.
- Five patients showed electrically evoked middle latency responses.
Conclusions:
- Peripheral neural elements and central auditory pathways remain functional post-labyrinthectomy.
- Cochlear implantation is a potential option for labyrinthectomized ears.
- Labyrinthectomy should remain a viable surgical option when indicated.