Comparison between electrocochleography and glycerol test in the diagnosis of Meniere's disease.

Electrocochleography (ECoG) and glycerol test were performed in 51 Meniere ears. The positive rate of both tests was compared. The positive rate of ECoG and glycerol test was 63% and 51%, respectively. The ears with positive result of both tests and of either test were 15 of 51 ears (29%) and 43 of 51 ears (84%), respectively. The positive rate of ECoG was higher in ears with a moderate to severe hearing loss at high frequencies, while the positive rate of glycerol test was higher in ears with a moderate to severe hearing loss at low frequencies. The present study has demonstrated that ECoG is different in selectivity of detection of the endolymphatic hydrops from glycerol test and that the combination of both tests increases the detection rate of the endolymphatic hydrops in Meniere's disease.