小児感音難聴の進行性について(立木孝教授開講十周年記念論文)

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One hundred and eleven children with bilateral hearing loss of unknown etiology have been followed up for a period of 1 to 6 years. Audiograms were studied from the view point of progression of hearing loss. Children were classified into 2 groups of 47 hereditary cases and 64 cases with unknown etiology.The conclusions obtained were as follows.1, Average hearing level deteriorated slowly during the observation period of 1-6 years. No difference was observed between both groups of the hereditary and unknown. Average deterioration was accounted for about 10 dB in 5-6 years.2. In 39 cases out of 111 cases (35, 1 % : hereditary group 29.8% and unknown group 39.1%), hearing level detetriorated more than 15 dB.3. The dominant shape of audiograms in cases with progressive hearing loss was gradually sloping, and in a few cases abrupt shape.
社団法人日本耳鼻咽喉科学会の論文