聽力増進中耳根治手術の提唱

　慢性中耳化膿症の治療に際しては，先ずその炎症消退を計るを目的として，色々の工夫がなされている。而して中耳炎症の消退を計るのは，炎症の進展して種々の合併症の續發を防ぎ，或は又中耳内炎症の進行を阻止して病變の擴大を最小限に止めんとするのである。

　而してこれがために，一般には粘膜病變を主とする中耳炎症に對しては，種々の非手術的療法が行われているのであるが，必ずしも滿足すべき結果を得ていない。又骨病變を伴う中耳炎症に對しては，色々の手術的治療が行われているのであるが，この際に於ても不滿足なことが少くない。

GOTO proposes a new term, Enhanced Hear-ing Radical Mastoidectomy, for a type of opera-tion in which the hearing was ameliorated after the procedure. Seventy two cases are operated by this method with resulting improvement of hearing which was shown by audiogram records.

It was observed that conditions which pre-served hearing after mastoidectamy appeared to be dependent upon preservation of tympanic membrane and patency of the Eustachian tube.

It was also observed that in some cases hearing may be improved when foramen rotund-um of the cochlea be closcd while others be-ing subjected to similar procedure will show no effects thereby; such differences as may occur may also be dependent upon the materi-al with which to effect the closure. By using a sound-probe it was found that cases showing amelioration of hearing by closure of foramen rotundum were the ones in whom sound con-duction through the short process of maleus was good, and, visa versa, cases with no im-provement showed that that conduction appear-ed to be poor. Present method of operation is devised upon experimentation on cats by attempting to amend the facts which led to loss of hearing.