Manabe Y, Kurokawa T, Saito T, Saito H
Department of Otorlaryngology, Fukui Medical School, Japan.
Acta Otolaryngol Suppl. 1995;519:262-4. doi: 10.3109/00016489509121919.
It is known that loud tones can damage the cochlea, but vestibular involvement has been given less attention. However, patients with noise induced hearing loss (NIHL) sometimes have balance disorders as well as some have symptoms resembling those of Meniere's disease. In this study, we examined the relationship between loud sounds and vestibular problems. Thirty-six NIHL patients were divided into two groups according to the presence (vertigo group) or absence (non-vertigo group) of vestibular complaints. Electrocochleograms were recorded from all subjects after pure tone audiometry. A higher incidence of increased -summating potential (SP)/action potential (AP) ratio was observed in the vertigo group than in the non-vertigo group. Caloric tests were performed in the vertigo group, and a reduced response was observed in 47.1% of ears. It is generally considered that the -SP/AP ratio is a useful indicator of endolymphatic hydrops. Therefore, episodic vertigo in NIHL patients may result from a pathophysiological mechanism similar to that of Meniere's disease.
众所周知，高强度音调会损害耳蜗，但前庭受累情况较少受到关注。然而，噪声性听力损失（NIHL）患者有时会出现平衡障碍，还有一些患者出现类似梅尼埃病的症状。在本研究中，我们研究了高强度声音与前庭问题之间的关系。36例NIHL患者根据是否存在前庭症状（眩晕组）分为两组。所有受试者在纯音听力测定后记录耳蜗电图。眩晕组的总和电位（SP）/动作电位（AP）比值升高的发生率高于非眩晕组。对眩晕组进行了冷热试验，47.1%的耳出现反应减弱。一般认为SP/AP比值是内淋巴积水的一个有用指标。因此，NIHL患者的发作性眩晕可能由与梅尼埃病相似的病理生理机制引起。
