方波急跳(square wave jerk简称S WJ)是快速、来回扫视运动,形成距形波。有不同的振幅、频率和宽度,无慢相。多数作者认为如睁眼能记录到S WJ是一种病理体征,由固视不稳定引起,提示中枢性(通常为小脑)损害,即正常受小脑控制的脑干扫视发生系统失控所致。但在前庭实验中SWJ是一个很普遍的现象。即令在睁眼固视情况下出现这种眼震波也不一定伴随中枢病变。本文研究SWJ频率、特征和意义。对429例眩晕和不稳感病人的眼震电图进行了复习。确定变温反应结果以慢相速度计算:C P值≥20%,DP值≥30%。单侧管麻痹及/或典型阵发性眼震(有潜伏期、疲劳及眩晕者)为外周性前庭系病变。有垂直性眼震(睁眼)及/或视测 Square wave jerk (S WJ) is a fast, back and forth, glancing motion, forming a distance wave. There are different amplitude, frequency and width, no slow phase. Most authors think that if WJ is a pathological sign of open-eye recording, SJ is a pathologic sign of instability, suggestive of central (usually cerebellar) damage that is caused by uncontrolled loss of cerebellum saccade normally controlled by the cerebellum. However, SWJ is a very common phenomenon in vestibular experiments. Even in the case of open eye fixation, such Nystagmus is not necessarily accompanied by central lesions. This article studies SWJ frequency, characteristics and significance. The nystagmography of 429 patients with dizziness and instability was reviewed. Determine the temperature change reaction results to slow phase velocity calculation: C P value ≥ 20%, DP value ≥ 30%. Unilateral paralysis and / or paroxysmal nystagmus (with latent period, fatigue, and vertigo) are peripheral vestibular lesions. There are vertical nystagmus (eyes open) and / or visual inspection