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Cochlear function of guinea pigs with experimental chronic renal failure
T Ohashi1, M Kenmochi, H Kinoshita
1Department of Otorhinolaryngology, St Marianna University School of Medicine, Yokohama City, Kawasaki, Japan.
The Annals of Otology, Rhinology, and Laryngology
|October 20, 1999
Summary
Chronic renal failure (CRF) impairs cochlear function in guinea pigs, potentially damaging hair cells. CRF also exacerbates noise-induced hearing loss, indicating a synergistic effect.
Area of Science:
- Ototolaryngology
- Nephrology
- Auditory Neuroscience
Background:
- Chronic renal failure (CRF) is a growing health concern.
- The impact of CRF on cochlear function and hearing is not fully understood.
- Potential interactions between CRF and ototoxic factors like noise require investigation.
Purpose of the Study:
- To electrophysiologically assess cochlear function in guinea pigs with induced CRF.
- To investigate the combined effects of CRF and noise exposure on hearing.
- To identify the primary site of cochlear lesion in CRF.
Main Methods:
- Guinea pigs underwent a five-sixths nephrectomy to induce CRF.
- Cochlear potentials, including compound action potential (CAP) and cochlear microphonics (CM), were recorded at 1, 2, and 3 months post-surgery.
- Electrophysiological recordings were also performed after broadband noise exposure in CRF and control groups.
Main Results:
- Progressive decline in CAP and CM observed at 1, 2, and 3 months post-nephrectomy.
- No significant reduction in endocochlear potential (EP) was detected.
- CRF animals exposed to noise showed no recovery of CAP and CM, unlike controls.
Conclusions:
- CRF is an independent risk factor for cochlear dysfunction.
- Auditory hair cells are likely the primary site of injury in CRF-induced hearing impairment.
- CRF and noise exposure exhibit a synergistic detrimental effect on auditory function.