Abstract
Electrocochleography(ECoG) is a clinically useful method for diagnosis of endolymphatic hydrops. Transtympanic ECoG was performed on 21 normal persons for obtaining basic data to diagnose Meniere’s disease. We measured the SP, AP and SP/AP ratio, and evaluated the effect of stimulus rate & intensity on these parameters. The results were as follows: As the stimulus rate was increased, the latencies of SP and that of AP were increased, the amplitude of AP was decreased due to adaptation, but the amplitude of SP was not changed. As the intensity was decreased, the amplitude of SP and AP were decreased and the latencies of SP and that of AP were lengthened. In normal persons, the amplitude of SP and that of AP were 3.70±1.56mV and 13.68±6.11mV respectively and the average of latencies of SP and AP are 1.36±0.06msec and 1.75±0.06msec respectively. The SP/AP ratio was 0.27±0.06.
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