メニエール病症例—純音聴力像の変動とECoG所見

Fluctuating Hearing Loss on Pure Tone Audiometry and Electrocochleography in Meniere's Disease: A Follow-up Study

　I．緒言

　メニエール病の診断に関しては，厚生省特定疾患メニエール病調査研究班による診断の手びき（表1）をはじめ，種々の診断基準が発表されている^1〜3）。典型例の診断は比較的容易であるが，非典型例の場合に安易にメニエール病と診断されることが少なくないと思われる。今回筆者らは，比較的典型例と言えるメニエール病症例を経験し，5年間にわたり追跡できたので，その診断基準を今一度見直すとともに，主として純音聴力検査成績の変動，加えて蝸電図についてその特徴的所見を述べ，若干の文献的考察を加えて報告した。

　Follow-up study on fluctuation of hearing level in a patient with Meniere's disease whom we have examined for the last 5 years is reported.

　Fluctuation on pure tone audiograms was more remarkable in low frequency than in middle and high frequencies.

　The differences between the maximal and minimal auditory threshold in low, middle and high frequencies were 51.7 dB, 23.3 dB and 21.6 dB, respectively. And auditory threshold in low frequency was markedly increased during the clinical course.

　Additionally, the electrocochleographic findings showing some characteristics for diagnosis of Meniere's disease by means of -SP/AP ratio are also reported.