Progressive Sensorineural Hearing Loss of Unknown Etiology.

Abstract

Thirty-three cases with progressive sensorineural hearing loss of unknown etiogy were studied. Twenty-four cases were bilateral and others were unilateral.
The results were summarized as follow.
1) The distribution curve of patient against age shows twod peaks, one was 0 to 10s and the other was 30s to 60s.
2) The rate of hearing impairment of the progression type was about 1dB/ month.
3) The unilateral type showed greater hearing loss in high frequency than the bilateral type.