Yamasoba T, Sugasawa T, Yagi M, Harada T, Futaki T
Department of Otolaryngology, Faculty of Medicine, University of Tokyo.
Nihon Jibiinkoka Gakkai Kaiho. 1990 Feb;93(2):219-28. doi: 10.3950/jibiinkoka.93.219.
Acute low-tone sensorineural hearing loss (ALHL) has the following three criteria; obscure origin, acute onset and sensorineural hearing loss limited to low frequencies. Sixteen cases of ALHL which were considered as cochlear hydrops using glycerol test and electrocochleogram were studied. All patients visited our department within two weeks after onset and were followed up for one year or more after initial examination. The subjective symptoms, the character of vestibular and hearing impairment and prognosis of 16 cases with ALHL were also investigated. The results were as follows. 1. Patients complained of ear fullness rather than hearing impairment. Four patients were unaware of hearing loss. 2. Recruitment phenomenon was found in all of 15 cases examined. Vestibular findings were mostly normal, except that spontaneous nystagmus was found in two cases and head-shaking nystagmus in one. 3. Recurrence and fluctuation of hearing impairment occurred in 14 cases. Three cases had an attack of rotatory vertigo once and two has diagnosed as Meniere's disease later. 4. During three months prior to last examination, hearing was stabilized in nine cases and continued to fluctuate in seven cases. In the former, hearing was improved in four cases, unchanged in three, and worsened in two. 5. Two patients underwent an endolymphatic sac operation and have had a good prognosis. 6. The authors suggest that most of ALHL should be considered as transient cochlear hydrops because the subjective symptom and audiological and vestibular findings of our cases are similar to those of cases which were reported as ALHL by other investigators. According to the findings of glycerol test and electrocochleogram, endolymphatic hydrops in ALHL is considered to exist in all turns of cochlea.
急性低频感音神经性听力损失（ALHL）有以下三个标准：病因不明、急性起病以及感音神经性听力损失局限于低频。对16例经甘油试验和耳蜗电图检查被认为是耳蜗积水的ALHL患者进行了研究。所有患者在发病后两周内就诊，并在初次检查后随访一年或更长时间。还对16例ALHL患者的主观症状、前庭和听力损害特征以及预后进行了调查。结果如下：1. 患者主诉耳闷而非听力减退。4例患者未意识到听力损失。2. 在所有15例接受检查的患者中均发现重振现象。前庭检查结果大多正常，仅2例发现自发性眼震，1例发现摇头眼震。3. 14例患者出现听力减退的复发和波动。3例曾发作过一次旋转性眩晕，2例后来被诊断为梅尼埃病。4. 在最后一次检查前的三个月中，9例患者听力稳定，7例患者听力持续波动。在听力稳定的9例患者中，4例听力改善，3例不变，2例恶化。5. 2例患者接受了内淋巴囊手术，预后良好。6. 作者认为，大多数ALHL应被视为短暂性耳蜗积水，因为我们病例的主观症状、听力学和前庭检查结果与其他研究者报道的ALHL病例相似。根据甘油试验和耳蜗电图检查结果，ALHL中的内淋巴积水被认为存在于耳蜗的所有转中。
