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Time-related changes in cochlear potentials in guinea pigs with experimentally induced endolymphatic hydrops
J Kusakari1, T Kobayashi, E Arakawa
1Department of Otolaryngology, Tohoku University School of Medicine, Sendai, Japan.
Acta Oto-Laryngologica. Supplementum
|January 1, 1987
Summary
Endolymphatic hydrops significantly impairs cochlear function over time, reducing electrocochleography potentials (EP) and action potentials (AP) progressively. Abnormalities in summating potential (SP) were most prominent early post-surgery.
Area of Science:
- Otolaryngology
- Neuroscience
- Auditory Physiology
Background:
- Endolymphatic hydrops is a condition characterized by fluid imbalance in the inner ear.
- Understanding the temporal changes in cochlear function during hydrops is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the progressive changes in cochlear function in a guinea pig model of endolymphatic hydrops.
- To analyze the time course of alterations in various cochlear potentials.
Main Methods:
- Endolymphatic hydrops was induced by obliterating the endolymphatic sac in 62 guinea pigs.
- Cochlear potentials, including electrocochleography (EP), compound action potential (AP), cochlear microphonic (CM), and summating potential (SP), were recorded at 1, 2, 4, and 12 weeks post-surgery.
Main Results:
- A significant reduction in EP was observed by the 2nd week, further decreasing by the 4th week, with no significant change between the 4th and 12th weeks.
- Amplitudes of CM and AP showed progressive decreases over time.
- SP abnormalities were most frequent in the 1st week, contrasting with other potentials.
Conclusions:
- Endolymphatic hydrops leads to progressive deterioration of cochlear function, affecting EP, CM, and AP over weeks.
- The early onset of SP abnormalities suggests a distinct pathophysiological role in the initial stages of hydrops.