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Cochlear Implantation in the Guinea Pig
Published on: June 15, 2018
Effect of Burow's solution on the guinea pig inner ear
Mitsuya Suzuki1, Akinori Kashio, Takashi Sakamoto
1Department of Otolaryngology, University of Tokyo, Tokyo, Japan.
The Annals of Otology, Rhinology, and Laryngology
|August 26, 2010
Summary
Intratympanic injection of Burow's solution for 2 hours caused outer hair cell damage and outer epithelium degeneration in the inner ear. Shorter exposure times showed no significant hair cell loss.
Area of Science:
- Ototoxicology
- Inner Ear Physiology
- Auditory Neuroscience
Background:
- Intratympanic injections are used for localized drug delivery to the inner ear.
- Burow's solution is a topical astringent with potential ototoxic effects.
Purpose of the Study:
- To investigate the effects of Burow's solution on inner ear hair cells.
- To determine the duration-dependent ototoxicity of Burow's solution.
Main Methods:
- Albino guinea pigs underwent intratympanic injection of Burow's solution with varying exposure times (30 minutes, 1 hour, 2 hours).
- Auditory brainstem responses (ABRs) were recorded to assess hearing function.
- Cochlear and utricular hair cells were examined using fluorescence microscopy.
Main Results:
- Prolonged exposure (1-2 hours) to Burow's solution significantly elevated ABR thresholds, particularly at higher frequencies.
- Outer hair cell loss was observed in the basal turn of the cochlea after 1 and 2 hours of exposure.
- Degeneration of the round window membrane's outer epithelium was evident in the 2-hour group.
Conclusions:
- Burow's solution demonstrates ototoxicity, causing damage to cochlear outer hair cells and the round window membrane.
- Exposure duration is critical, with 2 hours of contact leading to significant hair cell damage.
