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Effect of interaction between noise and toluene on auditory function in the rat
A C Johnson1, L Juntunen, P Nylén
1Department of Audiology, Karolinska Sjukhuset, Stockholm, Sweden.
Acta Oto-Laryngologica
|January 1, 1988
Summary
Exposure to toluene and noise can cause high-frequency hearing loss in rats. Combined exposure resulted in greater auditory impairment, primarily due to cochlear damage, with limited recovery observed.
Area of Science:
- Ototoxicology
- Auditory Neuroscience
Background:
- Occupational exposure to toluene and high-intensity noise are common.
- Both toluene and noise are known ototoxic agents, potentially damaging hearing.
Purpose of the Study:
- To investigate the effects of toluene and noise exposure, individually and sequentially, on auditory function in rats.
- To determine the extent of auditory impairment and potential for recovery.
Main Methods:
- Rats were exposed to toluene (1000 ppm) or noise (100 dB Leq) or both.
- Auditory function was assessed using brainstem audiometry across various high frequencies (1.6–20.0 kHz).
Main Results:
- Both toluene and noise exposure independently caused high-frequency auditory impairment.
- Sequential exposure to toluene followed by noise resulted in significantly higher auditory thresholds compared to individual exposures.
- Threshold shifts were most pronounced at 3.15 and 6.3 kHz, indicating synergistic ototoxicity.
Conclusions:
- The primary cause of auditory impairment was cochlear damage.
- Auditory pathways sustained only minor injury.
- Limited recovery of auditory function was observed post-exposure, particularly after combined toluene and noise exposure.