高度難聴を有する患者の中耳手術経験

AN EXPERIENCE IN MIDDLE EAR SURGERY FOR TREATMENT OF MARKED LOSS OF HEARING

　Ⅰ．緒言

　流行性耳下腺炎および突発性難聴などにより，1側または両側に，すでに高度の神経性難聴をきたした患者の比較的良側耳の中耳根本手術，あるいは鼓室成形術を行なつた場合，ときに残存骨導聴力の低下をきたし，非常に困る場合がある。私どもは過去10年間にかような症例を数例経験したので報告する。

　A middle ear operation was performed in 3 cases for treatment of severe bilateral loss of hearing. The first case showed a bilateral detrioration of hearing in the 6 th post operative year. The second case showed a similar bilateral loss on the 20th postoperative day. The third case, however, showed an improvement by increased bone conduction after the operation.

　The author states that in performing similar operations a deep considerations are needed to prevent any noise that may cause undue stimulation to the inner ear. The operation is preferably done under general anesthesia;the noises that are produced by the use of burrs, chisels and suctions should be reduced to the minimum.