多发性硬化患者的视觉、听觉和体感诱发电位的诊断价值

目的:探讨视觉诱发电位(VEP)、听觉诱发电位(BAEP)、体感诱发电位(SEP)对多发性硬化(MS)的诊断价值。方法:对22例临床诊断为MS的患者进行VEP、BAEP、SEP检测,并与正常对照组进行比较分析。结果:22例MS患者中VEP异常15例(68.2%),BAEP异常9例(40.9%),SEP异常12例(54.5%),异常中VEP有53.3%、BAEP有44.4%、SEP有58.3%的患者,临床有相应症状。结论:VEP、BAEP、SEP的检测有助于MS诊断以及亚临床病灶的发现。     

脑诱发电位地形图诊断要点

一、视觉诱发电位地形图(双眼全视野棋盘格翻转刺激)(VEP Mapping) 1.视神经炎及球后视神经炎 (1)急性期:视力明显下降时,①视诱发地形图显示在相当于P_(100)时相中枕叶双则对称性正相同电位消失。②视诱发电位的自后向前空间电位变化消失。 (2)随着视力的逐渐恢复枕区P_(100)时相的正     

多发性硬化的诱发电位分析

本对26例多发性硬化的病人进行脑干听觉诱发电位、视觉诱发电位,体感诱发电位的测定。以观察三种诱发电位在多发性硬化病人中的改变。经分析发现,三种诱发电位在多发性硬化病人中异常率较高,可提供第二个或多发的亚临床的客观证据,对本病的早期诊断有辅助价值,且对了解病情和预后有一定帮助。     

精神分裂症患者体感诱发电位的研究

本文研究了41例精神分裂症患者的SEP。发现其波型变异大、稳定性差、主波群波幅降低。与正常对照组比较有显著差异。提示可将SEP和其它多项诱发电位结合起来,作为临床的一种辅助检查手段。     

体感诱发电位与体感诱发电位地形图及其临床应用

体感诱发电位（Somatosensory Evoked Potential,SEP）一﹑概念：即躯体感觉诱发电位,它是给皮肤或末梢神经以刺激,神经冲动沿传入神经通路至脊髓感觉通路﹑丘脑至大脑皮层中央后回感觉区,在刺激的对侧头皮相应部位记录到的电活动。二﹑体感诱发电位的分类：（一）按记录和刺激电极放置部位分类1﹑上肢和下肢体感诱发电位2﹑感觉神经动作电位3﹑节段性诱发电位4﹑三叉神经体感诱发电位5﹑其他脑干诱发电位或反射6﹑膈神经和肋间神经诱发电位7﹑食管﹑直肠脑诱发电位8﹑二氧化碳激光痛觉诱发电位9﹑外阴部诱发电位10﹑     

视觉诱发电位检测对视神经炎的诊断价值

视觉诱发电位(visual evoked potential,VEP)为检测视神经上行通路皮质下结构(包括视神经、视交叉、视束、外侧膝状体和视放射)的神经电生理检查方法之一,主要反映视网膜视锥细胞的电活动情况,从而检测视觉通路神经的功能.Halliday等[1]最先将棋盘格翻转视觉诱发电位(PS-VEP)用于临床并获得肯定结果,其后VEP被广泛应用,已成为神经眼科学重要的辅助诊断手段之一.     

肌萎缩侧索硬化患者皮节体感诱发电位的研究

对28例肌萎缩侧索硬化(ALS)患者进行上肢皮节体感诱发电位(DSSEP)检查,结果2ALS显示DSSEP异常,异常率为7％,与磁共振影像(MRI)检查相对照,表明DSSEP例所确定病损平面与MRI显示脊髓受压平面相吻合,提示ALS患者DSSEP的异常,需考虑异常为ALS合并其他疾病之可能。     

视觉诱发电位在诊断多发性硬化症中的应用

目的：探讨视觉诱发电位对多发性硬化症早期诊断的应用价值。方法：对多发性硬化症患行视觉诱发电位（VEP）检查。结果：多发性硬化症患常有视神经受累，经视觉诱发电位检测，P100波潜伏期均有不同程度延长，P100波振幅降低。结论：视觉诱发电位对多发性硬化症早期诊断有重要价值。     

痉挛性斜颈体感诱发电位的研究

目的：探讨痉挛性斜颈患者大脑皮层功能的变化。方法：对30例痉挛性斜颈患者刺激正中神经后体感诱发电位（SEP）的P22、N30波潜伏期及P22、N30波幅进行比较分析,30例正常对照组仅在颈部主动向右侧扭转时对双侧P22、N30波幅进行比较分析。结果：病例组SEPP22、N30潜伏期正常,双侧比较差异无统计学意义,头部扭转方向的对侧大脑半球前中央区的P22-N30波幅比明显高于对侧,差异有统计学意义。正常对照组前中央区记录的双侧P22N30波幅比较差异无统计学意义。结论：SEP P22、N30潜伏期正常提示传导通路结构完整,头部扭转方向的对侧大脑半球前中央区的P22-N30波幅比明显高于对侧,提示患者对侧大脑皮层前中央区电活动存在异常的兴奋及抑制,即抑制性减弱,兴奋性增高,N30记录的是刺激正中神经SEP中长潜伏成分,可能来源于运动辅助区,进一步提示患者存在感觉一运动整合功能异常。     

脑血管病病人感觉障碍的体感诱发电位研究

目的：探讨脑血管病（ＣＶＤ）病人感觉障碍与体感诱发电位（ＳＥＰ）异常间的关系。方法：对ＣＶＤ２８例感觉障碍的病人，２１例只有运动障碍而无感觉障碍的病人和１０例正常人进行了ＳＥＰ研究。结果：感觉障碍组患侧中枢传导时间（ＣＣＴ）延长，与非患侧和正常对照组比较，差异均有显著性意义（Ｐ＜０．０５）。感觉障碍组Ｎ２０－Ｐ２５和Ｐ１５波幅比的异常率均明显高于无感觉障碍组。结论：ＣＶＤ的感觉障碍与ＳＥＰ的异常密切相关，ＳＥＰ可以做为判断ＣＶＤ时存在感觉障碍的客观指标     

Stationarity of the somatosensory evoked potential

The validity of the somatosensory evoked potential for serial neurological evaluation requires an understanding of normal variations in the responses Studies were conducted in 15 normal adult volunteers during two nights of sleep and in five normal adult volunteers during waking hours. The response amplitudes and latencies obtained during the day were demonstrated to be stationary by use of the runs or sign test Similarly, the earliest portions of the scalp recorded evoked potential were stationary during sleep Later portions of the responses had significantly lower amplitudes and demonstrated increased latency during deep sleep. The stability of the early portions of the SSEP suggest that it is a reliable tool for serial neurological evaluation. In private practice     

肝硬化失代偿期病人体感诱发电位观察

目的 :探讨肝硬化失代偿期病人的神经功能状态。方法 :对 30例肝硬化失代偿期病人进行体感诱发电位 (SEP)检查 ,刺激部位均为右腕正中神经。结果 :肝硬化失代偿期病人的SEP有着不同程度的改变 ,其中P15、N2 0 、P2 5、N3 5的潜伏期延长和N13 -P15的波间期延长分别占本组异常数的 85 %、40 %、35 %、2 5 %和 2 0 %。这些值与正常人组相比较 ,其两组间差异均有极显著性意义 (P <0 0 1)。结论 :SEP可为研究亚临床肝性脑病提供电生理学的客观依据。     

脑梗死患者的运动及体感诱发电位研究

目的：研究脑梗死患者的运动诱发电位（ＭＥＰ）及体感诱发电位（ＳＥＰ）改变。方法：对３０便脑梗死患者在急性期行经颅磁刺激ＭＥＰ检测,对其中２０例同时行电刺激ＳＥＰ检测,１０例患者２月后复查ＭＥＰ,并以３０例健康者作为正常对照组。结果：急性期ＭＥＰ的异常率为９３％,主要表现为皮层ＭＥＰ消失,中枢运动传导时间（ＣＭＣＴ）延长,波形异常及阈刺激强度增高。ＳＥＰ的异常率为３０％,表现为皮层波的缺失及中枢传导时间延长。复查ＭＥＰ有９例明显改善。结论：对于脑梗死的诊断,ＭＥＰ较ＳＥＰ敏感,但将ＭＥＰ与ＳＥＰ联合应用,可从不同的两个侧面反映运动及感觉功能受损的情况,弥补了ＣＴ仅能提供颅内解剖学改变而不能反映功能状态的不足。     

高颅压患者的体感诱发电位表现

目的：观察颅内压（ICP）增高对体感诱发电位（SEP）的影响。方法：对86例颅内病变引起的高颅压病人治疗前后进行体感诱发电位检测。同时测定患者脑压及血压。结果：ICP升高时SEP各波潜伏期延长，波幅降低，以N20波最明显，呈高度负相关，结论：SEP参数改变可间接推断ICP变化，并有助于病情及预后的判断。     

New depth short-latency somatosensory evoked potential (SEP) component recorded in human SI area

To analyse short and long-latency (SEPs) recorded by chronically stereotactically electrodes implanted in SI area of two epileptic patients. Two drug-resistant epileptic patients (2 females, 38 and 15 years, respectively) suffering from left temporal and right frontal epilepsy respectively, were investigated by an electrode-chronically implanted in SI area. Short and long latency somatosensory evoked potentials were recorded by depth electrodes 10 days after implantation. This is the first study to describe a depth N36 response by an intracerebral recording electrode in the SI area, probably generated by a radially oriented generator, located in area 1. Furthermore, we confirmed a role of SI in the genesis of N60 component. Finally, our present data suggest that the SI area is still active at 120 ms after the stimulus, since in one patient (no. 2) we identified a N120 potential, reaching its maximal amplitude at the same depth as the N20 response.     

65例颈椎型脊髓病体感诱发电位分析

目的研究颈椎型脊髓病皮质体感诱发电位（ＳＥＰ）变化。方法对６５例颈椎型脊髓病患者和２６例正常人进行正中神经和胫后神经刺激的ＳＥＰ对照研究，并对１０例患者作治疗前后对照观察。结果本组异常率为４５％，主要表现为各波替伏期和波间期（Ｎ２０—Ｐ２５，Ｐ２５—Ｎ３５，Ｐ４０—Ｎ４５）延长，且下肢的延长更加明显，部分患者出现波形分化不良。经保守治疗后６例正常，２例好转，且ＳＥＰ的好转先于临床的改善。结论ＳＥＰ对评判颈椎型脊髓病的脊髓传导功能具有重要的意义，且有助于临床预后的评价。     

脊髓体感与运动诱发电位术中联合监测的应用价值

目的：探讨脊髓体感诱发电位(SEP)与运动诱发电位(MEP)在脊髓手术中联合监测的临床应用价值。方法：对18例脊柱手术患者进行术中SEP和MEP联合监测，并用日本矫形学会量表(JOA)对患者术后神经功能进行评价。结果：全部患者术中SEP的P1、N1波幅有暂时性波动，潜伏期无明显变化。10例患者MEP的D1波波幅降低，但经改变手术方向后恢复正常，另8例患者MEP无明显变化。术后JOA评分较术前明显改善。结论：SEP及MEP术中联合监测，其波形稳定可靠，有利于避免“假阴性／假阳性”结果及术后神经功能障碍的发生。     

Facilitation of somatosensory evoked potentials by exploratory finger movements

Modification of somatosensory processing depending on the behavioral setting was studied. Active alternating movements of the fingers, passive tactile stimuli to the hand, and active exploration of objects were performed during recording of somatosensory evoked potentials (SEPs). SEPs were elicited by compound electrical median nerve stimulation and electrical stimulation at detection threshold of cutaneous median nerve fascicles identified by microneurography. Electrical stimulation was not time-locked to the studied condition.In comparison with SEPs at rest there was attenuation of early cortical potentials up to 25 ms post-trigger in all nonresting conditions. In stimulation of the compound median nerve as well as of isolated cutaneous fascicles of a hand actively exploring an object there was an additional increased negativity, peaking at 28 ms. This facilitory effect was independent of attentional focusing and was absent during exploration using the ipsilateral, non-electrically stimulated hand. In patients with parietal lesions the facilitatory effect was diminished on the affected side. Spline interpolated brain maps at this latency based on 32channel recordings in healthy volunteers showed a shift of local contralateral positive maximum from frontal to parietal during exploration, indicating enhancement of a tangential dipole. It is suggested that in conditions involving close sensorimotor interaction such as exploratory hand movements there is preactivation of a cortical area which is located in the central sulcus and receives cutaneous somatosensory inputs.     

Effect of geranylgeranylacetone on optic neuritis in experimental autoimmune encephalomyelitis

Optic neuritis is an acute inflammatory demyelinating syndrome of the central nervous system (CNS) that often occurs in multiple sclerosis (MS). Since it can cause irreversible visual loss, especially in the optic-spinal form of MS or neuromyelitis optica (NMO), the present study was conducted to assess the effects of geranylgeranylacetone (GGA) on optic neuritis in the experimental autoimmune encephalomyelitis (EAE) mouse model of MS. Myelin oligodendrocyte glycoprotein-induced EAE mice received oral administration of GGA at 500 mg/kg or vehicle once daily for 22 days. The effects of GGA on the severity of optic neuritis were examined by morphological analysis on day 22. Visual functions were measured by the multifocal electroretinograms (mfERG). In addition, the effects of GGA on severity of myelitis were monitored both on clinical signs and morphological aspects. The visual function, as assessed by the second-kernel of mfERG, was significantly improved in GGA-treated mice compared with vehicle-treated mice. GGA treatment decreased the number of degenerating axons in the optic nerve and prevented cell loss in the retinal ganglion cell layer. However, the severity of demyelination in the spinal cord remained unaffected with the treatment of GGA. These results suggest that oral GGA administration has beneficial effect on the treatment for optic neuritis in the EAE mouse model of MS.