Jiménez J, Mata J
Centro Audiológico, S.L. Sevilla, Servicio ORL, Hospital Universitario Virgen de Valme, Sevilla.
Acta Otorrinolaringol Esp. 1998 Aug-Sep;49(6):431-5.
We report 97 cases of micrographic nystagmus recordings elicited by the caloric test. This response was found in 27% of patients examined for dizziness. The main feature of these tracings was low amplitude. Patients had a mean age of 55 years, frequent episodes of instability related with head movements, and perception of imbalance during walking which was described as being like drunkenness. No noteworthy audiological findings were observed, but there were signs of cervical bone lesions on radiography, scanning, vertebral Doppler, and MRI. The special organization of the arterial system of the inner ear as a terminal system make it sensitive to hemodynamic effects of ischemic and hypoxic episodes, which explains the frequency and nature of the dizziness described. Although not pathognomonic, micrographic recordings or a low-amplitude nystagmus response to the caloric test suggest the existence of the hemodynamic phenomenon of vertebrobasilar insufficiency.
我们报告了97例由冷热试验诱发的微图形眼震电图记录。在因头晕接受检查的患者中，有27%出现了这种反应。这些记录的主要特征是振幅低。患者的平均年龄为55岁，经常出现与头部运动相关的不稳发作，以及行走时的失衡感，这种失衡感被描述为像醉酒一样。未观察到值得注意的听力学检查结果，但在X线摄影、扫描、椎动脉多普勒检查和磁共振成像中发现了颈椎骨病变的迹象。内耳动脉系统作为终末系统的特殊结构使其对缺血和缺氧发作的血流动力学效应敏感，这解释了所描述头晕的频率和性质。虽然不是特异性的，但微图形记录或对冷热试验的低振幅眼震反应提示存在椎基底动脉供血不足的血流动力学现象。
