English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Clinical and electrocochleographic studies of low tone familial deafness were carried out in 19 patients of 10 families. These hearing impairments were characterized by an upward-sloping pure tone audiogram with 50dB to 60dB hearing threshold below 2000Hz and with normal or near-normal hearing threshold above this frequency. The type of inheritance in these families showed autosomal dominant mode and no associated malformation. In 7 patients, hearing tests were repeated, it was observed that hearing threshold was not elevated. The short increment sensitivity index (SISI) tests were positive suggesting a hair cell lesion in tested 7 patients. The caloric tests were normal in tested 3 patients. No abnormal internal ear configuration was found in both X-ray and high-resolution computed tomography. Twelve patients with these familial low tone deafness (FLTD), 19 patients with Ménière's disease, and 9 patients with low tone sudden deafness (LTSD) were studied using the transtympanic electrode technique of electrocochleography. All patients of FLTD showed normal negative summating potential (-SP) amplitude, and the cochlear microphonics (CM) showed a nearly same detection threshold as hearing level of the pure tone audiogram at 1 kHz and 0.5 kHz. The evidence suggested that the hearing impairment resulted from a localized abnormality of the cochlear apex, and without endolymphatic hydrops. On the other hand, patients with Ménière's disease and LTSD showed a high -SP amplitude and a satisfactory detection threshold of CM compared with hearing level of the pure tone audiogram. These findings suggest that both Ménière's disease and LTSD relate to endolymphatic hydrops.

Familial deafness showing hearing pattern of low-tone losses.