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Cochlear Implantation in the Guinea Pig
Published on: June 15, 2018
Histologic changes after semicircular canal occlusion in guinea pigs.
E E Smouha1, M Inouye, L L Sobol
1Division of Otolaryngology-Head and Neck Surgery, State University of New York at Stony Brook, 11794-8191, USA.
The American Journal of Otology
|September 30, 1999
Summary
Surgical trauma to the inner ear can cause hearing loss through electromechanical changes, not cell death. Histology showed preserved hair cells, suggesting function loss is reversible.
Area of Science:
- Otolaryngology
- Neurotologic Surgery
- Auditory Physiology
Background:
- Hearing preservation techniques are advancing in neurotologic surgery.
- Mechanisms of hearing preservation/loss after partial labyrinthectomy remain unclear.
Purpose of the Study:
- To investigate histologic changes after surgical trauma to the inner ear in guinea pigs.
- To correlate these changes with auditory function preservation/loss.
Main Methods:
- Guinea pigs underwent various surgical procedures: semicircular canal occlusion, perilymph suctioning, ampullectomy, or vestibulotomy.
- Auditory brain stem response (ABR) thresholds were monitored weekly post-surgery.
- Temporal bone histology was analyzed and correlated with ABR findings.
Main Results:
- Semicircular canal occlusion preserved ABR thresholds.
- Perilymph suctioning caused transient threshold loss with recovery.
- Ampullectomy and wide vestibulotomy led to variable and permanent auditory function loss, respectively.
- Histology revealed inflammation and fibrosis but preserved cochlear and vestibular hair cells.
Conclusions:
- Electromechanical changes, not hair cell death, likely underlie auditory and vestibular dysfunction post-partial labyrinthectomy.
- Surgical approach influences the degree of hearing preservation or loss.
