Electrocochleographical findings in low tone sensorineural deafness.

Osawa Hirohide, Kumagami Hidehaku, Kunimura Mitsuharu, Nakao Yoshiaki, Miyazaki Makoto

doi:10.4295/audiology.28.749

The cases with low tone sensorineural deafness were studied using the transtympanic-electrode technique of electrocochleography. The results obtained were as follows: 1) Low tone sensorineural deafness of sudden onset without vertigo: All the cases showed high AP and -SP amplitude and satisfactory CM response. These findings resembled the electrocochleographic findings of type I of Ménière's disease suggesting of the relationship with endolymphatic hydrops. The hearing returned to normal range in a half of the cases but remained hardly changed in the other half. The difference between these two groups could not be clarified electrocochleographically. 2) Familial progressive deafness showed low tone sensorineural deafness: This case showed a high threshold and a low amplitude of CM at low frequency, and showed cochlear hair cell damage at low frequency range. 3) Low tone sensorineural deafness due to retrolabyrinthine lesion: This case showed a normal CM but a low AP amplitude, and lacked a rapid increase of AP amplitude with increasing click intensity in the intensity region of AP input-output functions.

Electrocochleographical findings in low tone sensorineural deafness.

Bibliographic Information

Description

Journal

Keywords

Details 詳細情報について

Export

Report a problem