TRANSTYMPANIC ELECTROCOCHLEOGRAPHY IN MENIERES-DISEASE USING CLICKS AND TONE-BURSTS

Transtympanic electrocochleography (ECoG), using clicks and tone-burst s at 500, 1000, and 2000 Hz, was employed to study 80 patients with Me niere's disease and 25 non-Meniere's patients. The magnitude of the ne gative summating potential and the summating potential:action potentia l ratio (SP:AP) were examined in both groups. Groups were further divi ded based upon degree of hearing loss and audiometric configuration. A n elevated SP:AP ratio was found in 83.7 percent of the Meniere's ears and 12 percent of the non-Meniere's. The likelihood of obtaining a po sitive ECoG in Meniere's patients was strongly related to degree of he aring loss but not audiometric configuration.