DELAYED COCHLEAR MICROPHONIC POTENTIALS IN CLINICAL ELECTROCOCHLEOGRAPHY

Abstract

Electrocochleography was performed in patients suffering from Meniere's disease and other conditions. The delayed cochlear microphonic potentials (delayed CMs) recorded in response to low stimuli were then analyzed.
Delayed CMs were evoked more frequently by 1, 000 Hz short tone bursts than by 500 Hz short tone bursts. Patients with delayed CMs had better hearing acuity and higher cochlear action potentials (AP) than those without delayed CMs.
Delayed CMs evoked by 500 Hz short tone bursts were clearly observed in patients who retained low-frequency sensitivity, while delayed CMs evoked by 1, 000 Hz short tone bursts were clearly observed in patients who retained high-frequency sensitivity. No significant differences were found in the presence or absence of delayed CMs between Meniere's disease and other conditons.