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Hearing preservation with labyrinthine ablation in otitis media
P J Antonelli1, R D Briggs, K J Gerhardt
1Department of Otolaryngology, University of Florida, Gainesville 32610-0264, USA. antonpj@ent.ufl.edu
The Laryngoscope
|May 12, 2000
Summary
Hearing preservation is possible even with inner ear surgery during middle ear inflammation. Ablating a semicircular canal in infected ears may not cause profound hearing loss, suggesting other factors are involved.
Area of Science:
- Otolaryngology
- Neuroscience
- Surgical Innovation
Background:
- Iatrogenic inner ear fenestration during otitis media often results in permanent hearing loss.
- Hearing preservation is typically achievable via controlled vestibular labyrinth ablation in non-inflamed ears.
Purpose of the Study:
- To investigate the feasibility of preserving hearing when the inner ear is violated in the presence of middle ear inflammation.
Main Methods:
- A prospective, controlled animal model using guinea pigs with induced otitis media.
- Semicircular canal transection and sealing were performed 2-4 days after inducing otitis media via bacterial or formalin-killed bacterial injection.
- Hearing thresholds were assessed pre- and post-labyrinthine ablation.
Main Results:
- Otitis media was successfully induced in all animal subjects.
- Hearing loss (>15 dB threshold elevation) was observed in a subset of animals infected with nontypeable Haemophilus influenzae, regardless of fenestration.
- No significant hearing loss was noted in ears infected with Streptococcus pneumoniae.
Conclusions:
- Ablation of a semicircular canal during middle ear inflammation does not invariably lead to profound sensorineural hearing loss.
- Factors beyond general middle ear inflammation likely influence hearing outcomes after iatrogenic inner ear violation.