Summating Potential in Meniere's Disease.

Summating potential (SP) findings in Meniere's disease were reviewed based mainly on the results of our study. Many studies have confirmed that an increased negative SP is observed more often in ears with endolymphatic hydrops such as Meniere's disease than in ears with other diseases. Recent reports have showed that negative SP in Meniere's disease is unchanged during hearing fluctuation although action potential (AP) is changed, and that positive SP is more frequently observed in Meniere's disease. Our recent study suggests that positive SP may provide different information on the pathophysiology of Meniere's disease from that obtained from negative SP. Recent reports have demonstrated that the combination of electrocochleography with glycerol test increases the diagnostic rate of Meniere's disease.