若年型特発性両側性感音難聴の臨床的研究

概要

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One hundred and thirty six children with bilateral hearing loss of unknown etiology were followed up for a period of 6 months to 9 years. These children were classified into 2 groups; 20 cases of idiopathic bilateral sensorineural hearing loss and 116 non-progressive cases. The conclusions obtained by comparative study on the 2 groups were as follows: 1. Progression was observed in 30% of sensorineural hearing loss of unknown etiology. Almost 50% of these progressive cases, correspondingly to 15% of all cases, belonged to the idiopathic bilateral sensorineural hearing loss (IBSH) group. 2. The age of IBSH cases, on the first visit to our clinic, ranged from 4 to 11 years old, mostly 8 year-olds or younger. 3. Progression was observed at age 4 through 14, and mostly at age 7 and 8.4 The dominant shape of audiogams of IBSH cases, was of a gradually sloping type, in which a saucer type audiogram appeared more frequently. 5. No difference was found between the 2 groups of IBSH and others in regards to genetic factors. 6. No essential difference was found between the juvenile type of IBSH and other sensorineural hearing loss group of unknown etiology without rapid progression.
耳鼻と臨床会の論文