Older clinical manifestations of deafness

Normal tympanic membrane, a middle-aged after the two ears of symmetric sensorineural hearing loss, tinnitus Treble with a pre-3000 Hz started to decline gradually spread to 4000 ~ 6000 Hz IF, and also because of the basement membrane rupture sudden loss of high-frequency sound. General conversation men than women and children sound easy to understand language, pure tone audiometry in accordance with the above four pathological changes, there are ups and downs, declining different curve sensorineural deafness, language recognition rate differential, the sound bad. Bunch (1931) found that the growth of human hearing loss with age is increasing year on year. 1957 United States Wisconsin Hearing Research Center, has made a standard curve of elderly deaf, plans can be found in the normal hearing a certain age profile of this figure shows more than 70 ~ 90-year-old hearing relatively stable.