Abstract：
:Endocochlear potentials (EPs) were investigated in healthy guinea pigs and in those exposed to white noise of 125 dB SPL for 20-80 min. EPs were measured during and after temporary anoxia (3.5 min, denoted as reversible anoxia) and then during continuous anoxia to evaluate noise-induced changes in EP properties. Succino-dehydrogenase (SDH) activity and morphologic changes in hair cells were also evaluated in surface preparations of the hair cells. It was found that changes in EPs correlated with the duration of noise exposure. The longer the noise exposure, the greater the decrease in EPs. EPs could recover in one week post-exposure, in roughly the same time needed for recovery of SDH activity in hair cells. Noise exposure also resulted in some changes in EP dynamic behaviour during and after reversible anoxia, but did not cause any significant change in maximal negative EP. The mechanisms underlying these results are discussed.
journal_name
Hear Resjournal_title
Hearing researchauthors
Wang JA,Dong WJ,Chen JSdoi
10.1016/0378-5955(90)90076-2subject
Has Abstractpub_date
1990-03-01 00:00:00pages
143-9issue
2-3eissn
0378-5955issn
1878-5891pii
0378-5955(90)90076-2journal_volume
44pub_type
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