transtympanic electrocochleography for evaluation of meniere's disease

35 patients with unilateral sensorineural impairment and hearing levels within the normal range in the opposite ears were investigated by bilateral transtympanic electrocochleography (tiecog). only 19 patients (54%) satisfied the criteria for meniere's disease and 16 patients (46%) showed sensorineural impairment due to other etiologies. clinical studies have focused exclusively on the a mplitude ratio of the summating potential (sp) and the action potential (ap) derived from alternating polarity click responses (le., sp/ap). in only clinically defined ears with meniere's disease have abnormally large sps been found. neither normal ears nor sensorineural impaired ears of other etiologies exhibited abnormal sps, hence we used normal ears as a control in this study.