Dexamethasone exerts reliable therapeutic effects when used to treat NIHL. It seems that the protective effects may differ by the routes of administration as the OCs were better preserved in the IP group and the ET-OHC synapses were more intact in the IT group.

ConclusionZZThe degree of remaining activity of auditory cortex and the lateralization of the dominant auditory hemisphere, which may influence on the outcome of cochlear implantation, could be measured by ECD-SPECT.