An attempt to measure the diametric relationship between slow and quick phases of nystagmus.
An attempt to measure the diametric relationship between slow and quick phases of nystagmus.
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尝试测量眼球震颤的慢相和快相之间的直接关系。
DOI：
10.1080/00016489.2018.1425903
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Omori K.
中科院分区：
文献类型：
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作者：
Kanazawa Y;Funabiki K;Taura A;Imai T;Torii H;Ogita H;Okano T;Ito J;Omori K.
目的：探讨我们的原始方法是否能准确地评估眼球震颤慢相和快相之间的夹角（向量角），以及向量角分析是否有助于区分水平型眼球震颤和混合型眼球震颤。记录健康志愿者的热量性眼球震颤;记录每位患者的位置性眼球震颤。结果：在热性眼震中，随着慢相速度的增加，眼震矢量角逐渐接近180 °，表明我们的矢量角测量方法在快速眼震中更可靠。重要的是，在周围性前庭疾病的水平眼震中，随着慢相速度的增加，矢量角同样接近180度;相反，在椎基底动脉功能不全或脊髓小脑变性的混合性眼震中，矢量角与热量眼震的角度有显著差异。对非外周性前庭疾病的诊断有一定的帮助。
Objective:To investigate whether our original method can precisely evaluate the angle between slow and quick phases of nystagmus (vector angle) and to determine whether vector angle analysis is helpful in differentiating between horizontal nystagmus and mixed nystagmus with horizontal and vertical components.Methods:We included 20 healthy volunteers, 17 patients with horizontal nystagmus, and 15 patients with mixed nystagmus. Caloric nystagmus was recorded in healthy volunteers; positional nystagmus was recorded in each patient. We extracted the velocity of nystagmus from eye movement of each subject and analysed the vector angle.Results:In caloric nystagmus, the vector angle approached 180 degrees as slow-phase velocity increased, suggesting that our vector angle measurement is more reliable with faster nystagmus. Importantly, in horizontal nystagmus from peripheral vestibular disease, the vector angle similarly approached 180 degrees as slow-phase velocity increased; in contrast, the vector angle in cases of mixed nystagmus from vertebrobasilar insufficiency or spinocerebellar degeneration significantly differed from the angle of caloric nystagmus.Conclusions:Vector angle analysis using our original algorithm can precisely evaluate the diametric relationship in vestibular nystagmus; it may be helpful in diagnosis of non-peripheral vestibular disorders.