著者
杉本 賢文 曾根 三千彦 大竹 宏直 寺西 正明 杉浦 淳子 吉田 忠雄
出版者
一般社団法人 日本聴覚医学会
雑誌
AUDIOLOGY JAPAN (ISSN:03038106)
巻号頁・発行日
vol.59, no.4, pp.218-223, 2016-08-30 (Released:2017-03-18)
参考文献数
12

要旨: 10歳時に初めて高度難聴を指摘できた人工内耳手術症例を経験したので報告する。 5歳時より難聴を疑わせる症状を呈していたが, 耳鼻咽喉科診療所や総合病院耳鼻咽喉科にて複数回純音聴力検査を受けても難聴は指摘されなかった。 当院初診時の純音聴力検査による聴力レベル (4分法) は右 98.8dB, 左 92.5dB と 500Hz 以上の中高音域にて高度な難聴を認めたが, 右耳の 125, 250Hz では 30~40dB の残存聴力を有していた。 初診10ヶ月後には, 補聴器装用効果不十分のため, 左耳へ人工内耳植込術を実施した。 10歳まで高度難聴を把握できなかった要因としては, 難聴が徐々に進行した可能性, 低音域に残存聴力が存在したこと, 不十分な聴力評価により繰り返し難聴を否定されてきたことなどが考えられた。 小児の聴力検査を行う際は, 他覚的聴覚検査の併用も考慮し, 慎重に診断を行うべきである。
著者
吉田 忠雄 加藤 正大 大竹 宏直 加藤 健 寺西 正明 片山 直美 中島 務
出版者
Japan Society for Equilibrium Research
雑誌
Equilibrium research (ISSN:03855716)
巻号頁・発行日
vol.72, no.4, pp.247-253, 2013-08-01
被引用文献数
3

Development of 3-tesla enhanced magnetic resonance imaging (MRI) provides a tool for the visualization of endolymphatic hydrops (EH). This technique was first developed in animal experiments and adapted in patients with inner ear diseases including Menieres disease (MD). Up to the present, we have demonstrated EH in many MD patients. Recently, we have succeeded in obtaining a 3D-real IR-like image even after intravenous standard-dose gadolinium administration. This type of image was named the HYDROPS (HYbriD of Reversed image Of Positive endolymph Signal and native image of positive perilymph signal). The relationship between unilateral MD and EH has not yet been explored. We studied 76 patients with unilateral MD who were evaluated using MRI. The mean age of the subjects was 53.4 years (range 17 to 80 years). Forty-two were women and 34 were men. Symptomatic and non-symptomatic ears were categorized into 4 groups (healthy, 76; possible, 48; Probable, 13; and definite, 15) based on AAO-HNS definitions. MRI was performed 4 hours after intravenous gadolinium administration. Overall, 152 ears were evaluated. EH in the cochlea was present in 57 of 76 symptomatic ears (73.7%) and 34 of 76 (44.7%) non symptomatic ears. Ears with definite MD had EH more frequently in the cochlea than ears in the healthy ears groups. Furthermore, EH in the vestibule with definite MD was larger than ears in any of the other groups. Our reports showed for the first time that there was Ba relationship between the degrees of EH and the stage of MD. Moreover, in fewer than half of unilateral MD patients EH was seen in the cochlea with non-symptomatic ears. EH in healthy ears may be an indicator of bilateral MD. Using MRI to identify this covert EH in asymptomatic patients may offer the possibility of early detection or prevention of MD.