TRANSTYMPANIC ELECTROCOCHLEOGRAPHY IN EVALUATION OF COCHLEOVESTIBULARDISORDERS

We examined the electrocochleography (ECochG) parameters in patients s uffering from Meniere's disease (n = 5) or other type of vertiginous d isorder (n = 4). Fourteen ears were examined by introducing a needle e lectrode through the tympanic membrane to the promontorium. The summat ing potential (SP), action potential (AP) and the SP/AP ratio were mea sured from the alternating polarity click response, and the latency di fference from the condensation and rarefaction click responses. These 2 patient groups differed from each other most clearly as to the audio metry results and the duration of symptoms. We also found differences in electrocochleographic results, especially in latency differences be tween the condensation and rarefaction click responses. Although the p resent material is small we conclude that transtympanic electrocochleo graphy is a sensitive method to measure cochlear potentials, and might be a valuable addition in diagnosing patients suffering from Various cochleovestibular disorders.