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Investigations evaluating the protective effect of Ginkgo biloba extract (EGb)
on gentamicin (GM) ototoxicity were undertaken. Guinea pigs treated with 5 mg/kg
gentamicin sulfate on the round window niche (RWN) showed acute changes on
electrocochleogram and hair cell or microvilli damage on scanning electron
microscopy (SEM). There was accumulation of GM in the whole cochlea, especially
in the organ of Corti, stria vascularis, and type III fibrocyte on
immunohistochemical study. However, the guinea pigs pretreated with local or
systemic EGb revealed no significant changes by local GM installation. From
these results, we concluded that EGb has a protective effect on the development
of GM ototoxicity in the cochlea.