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1.
目的 对比相同麻醉深度下丙泊酚、七氟醚分别复合瑞芬太尼维持麻醉对经颅电刺激运动诱发电位(TES-MEPs)波幅和潜伏期的影响,以建立术中MEP监测时的适宜麻醉方法.方法 36例脊髓脊柱神经外科手术患者随机分为两组:丙泊酚麻醉组和七氟醚麻醉组,每组18例.对比麻醉诱导后30 min、60 min、90 min和120 min MEP的波幅和潜伏期.结果 两组病例麻醉期间血流动力学均维持稳定,组间脑电双频指数、呼气末二氧化碳分压和体温的差异均无统计学意义.丙泊酚组MEP所需阈刺激强度显著低于七氟醚组[(172±23)V:(217±42)V,P<0.05].丙泊酚组各时间点上肢MEP波幅显著高于七氟醚组(P<0.05),潜伏期显著短于七氟醚组(P<0.05).两组内各时间点上肢MEP波幅和潜伏期差异无统计学意义.结论 在相同麻醉深度下,丙泊酚复合瑞芬太尼全凭静脉麻醉对MEP波幅的抑制作用显著优于七氟醚复合瑞芬太尼静吸复合麻醉方案,是用于脊髓脊柱手术TES-MEPs监测的适宜麻醉方法.  相似文献   

2.
目的:研究经颅电刺激运动诱发电位(MEP)和体感诱发电位(SEP)与急性脑血管病(ACVD)患者功能状态的关系。方法:对54例有偏瘫体征的ACVD患者行MEP和SEP检查,同时作肌力和临床神经功能评分测定。结果:ACVD病人MEP的异常率为88.9%,主要表现为MEP缺失,潜伏期延长,波幅降低或波形异常,中枢运动传导时间(CMCT)延长,患者与健侧及对照组比较,有显著差异(P<0.01)。MEP缺失者,瘫痪重;MEP可引出者,瘫痪程度轻,两者间差异显著(P<0.01)。SEP的异常率为42.6%,表现为中枢传导时间延长和皮质波异常或消失,功能评分为重型者,异常率高;轻型者,异常率低。结论:MEP可定量分析ACVD病人运动功能的缺损情况,结合SEP可提供更多的脑部信息。  相似文献   

3.
目的 :研究经颅电刺激运动诱发电位 (MEP)和体感诱发电位 (SEP)与急性脑血管病 (ACVD)患者功能状态的关系。方法 :对 5 4例有偏瘫体征的ACVD患者行MEP和SEP检查 ,同时作肌力和临床神经功能评分测定。结果 :ACVD病人MEP的异常率为88 9%,主要表现为MEP缺失 ,潜伏期延长 ,波幅降低或波形异常 ,中枢运动传导时间 (CMCT)延长 ,患者与健侧及对照组比较 ,有显著差异 (P <0 0 1)。MEP缺失者 ,瘫痪重 ;MEP可引出者 ,瘫痪程度轻 ,两者间差异显著 (P <0 0 1)。SEP的异常率为 42 6 %,表现为中枢传导时间延长和皮质波异常或消失 ,功能评分为重型者 ,异常率高 ;轻型者 ,异常率低。结论 :MEP可定量分析ACVD病人运动功能的缺损情况 ,结合SEP可提供更多的脑部信息  相似文献   

4.
目的探讨在常用麻醉方案下采用经颅短串电刺激技术获得运动诱发电位(MEP),从而实现运动传导通路的术中监护的可行性.方法随机选择华山医院神经外科自2002年6月至2003年1月共40例无明显肢体肌力减退的手术患者,给予异丙酚全静脉麻醉,采用经颅短串电刺激技术(刺激参数:30~100 mA;单个脉冲波宽:100~500 μs;脉冲波间隔时间:1.25~5 ms;每串所含脉冲波个数:2~5个/串)诱发运动诱发电位,记录对侧上肢前臂屈肌群,拇短展肌和小指展肌所获电位的波幅和潜伏期,考察各刺激参数对所获电位的影响及其最佳组合.结果在94.6%的患者中,采用80~100 mA,500 μs,2 ms,4个/串的刺激参数组合能获得波幅和潜伏期均满意的MEP.结论选用异丙酚全静脉麻醉,配合使用经颅短串电刺激技术可以获得MEP,有望实现对运动传导通路的术中监护.  相似文献   

5.
目的:探讨低频重复经颅磁刺激(rTMS)对PD患者运动皮质兴奋性影响的持续效应。方法:对38例PD患者,予0.5Hz rTMS刺激其主要受累肢体对侧的M1Hand(20×80,100%RMT),连续7d。于首次干预前及末次干预后20min、1周及1个月分别评价其临床运动功能和运动诱发电位。结果:低频rTMS干预后,PD患者UPDRS Ⅲ、僵直、运动迟缓评分、计时运动试验及CSP均存在显著时间效应(P<0.001)。结论:低频rTMS可改善PD患者运动迟缓症状,其对运动功能的影响可持续到刺激停止后1个月,与运动皮质兴奋性的改变一致。  相似文献   

6.
经颅磁刺激运动诱发电位   总被引:6,自引:0,他引:6  
  相似文献   

7.
脊髓型颈椎病病人经颅磁电刺激运动诱发电位的对比研究   总被引:1,自引:0,他引:1  
目的探讨磁电刺激运动诱发电位(MEP)在脊髓型颈椎病(CSM)的应用价值,并对其临床相关性进行分析。方法采用经颅磁、电刺激对30例脊髓型颈椎病病人以及年龄性别等相配匹的30名健康成人分别于外展小指肌、肱二头肌及下肢展短肌表面进行MEP的检测。结果全部病人的MEP都出现异常,表现为潜伏期、中枢传导时间(CMCT)延长,时限增宽,波辐降低或不能引出。磁刺激MEP的CMCT和皮层刺激潜伏期与脊髓型颈椎病临床日本整形外科协会(JOA)评分间有密切相关性,能较好地反映CSM病人的病情。结论MEP在检测CSM病人运动功能方面具有定量评价作用。与电刺激相比,磁刺激MEP能更好地反映CSM病人的病情。  相似文献   

8.
9.
在全麻病人中,采用经颅短串电刺激技术,能获得波幅和潜伏期均满意的运用诱发电位,应用于术中监护,可有效监测手术对肌力的影响。  相似文献   

10.
脑血管病患者经颅磁刺激运动诱发电位的研究   总被引:2,自引:0,他引:2  
采用经颅磁刺激运动诱发电位(MEP)对72例脑血管病(CVD)患者和50例正常人进行检测。结果:CVD患者瘫痪侧上肢磁刺激无反应或皮层潜伏期和中枢传导时间(CMCT)较正常对照组和健侧显著延长(P<0.001);瘫痪侧下肢磁刺激无反应或CMCT较正常对照组和健侧显著延长(P<0.05)。脑出血与脑梗塞患者MEP异常率无显著差异(P>0.05),而与临床病情轻重和病变部位密切相关。提示MEP能客观反映CVD患者中枢运动传导通路功能受损的情况。  相似文献   

11.
目的评价脑磁图(MEG)术前定位初级运动皮质(M1)的准确性。方法选取顺序入院的中央区胶质瘤26例,术前均运用MEG定位皮质运动区,与MRI导航影像融合,在神经导航下定位MEG激活区。术中对MEG成功定位的病例行直接皮质电刺激(DCES),比较两种技术的吻合度。结果因病人不能配合,MEG定位失败2例,余24例均定位成功,每例激活区1~5个。DCES成功监测24例,所有选择的DCES靶点共41个,阳性靶点24个,1个/例。以所有的41个靶点分析,MEG定位M1区与DCES定位的吻合率为58.5%;而以第1组病灶侧M1区和第2组病灶侧中央区的MEG激活区中27个靶点分析,两者吻合率为88.9%;仅以第1组M1区的MEG激活区中17个靶点分析,两者吻合率为100%。结论 MEG可以灵敏而可靠地定位M1区,可用于中央区胶质瘤病人术前手术规划。  相似文献   

12.
目的探讨导航经颅磁刺激定位双手运动功能区的准确性和安全性。方法采用导航经颅磁刺激对10例右利手的健康志愿者双手第一骨间背侧肌进行刺激,定位双手运动功能区及其边界,记录阳性位点坐标和运动诱发电位,并计算双手运动功能区面积。结果 10例受试者均成功定位双手运动功能区,主要定位于中央前回"Ω"区及其周围;右手运动功能区面积大于左手[(6.22±0.76)cm2对(4.30±0.40)cm~2;t=7.078,P=0.000];其中4例表现出困倦,无一例出现头痛、癫发作等不良反应。结论导航经颅磁刺激定位手运动功能区准确、安全,可作为术前定位运动功能区和研究运动功能重塑的辅助方法。  相似文献   

13.

Background

Transcranial magnetic stimulation (TMS)-evoked potentials (TEPs), recorded using electroencephalography (TMS-EEG), offer a powerful tool for measuring causal interactions in the human brain. However, the test-retest reliability of TEPs, critical to their use in clinical biomarker and interventional studies, remains poorly understood.

Objective/Hypothesis

We quantified TEP reliability to: (i) determine the minimal TEP amplitude change which significantly exceeds that associated with simply re-testing, (ii) locate the most reliable scalp regions of interest (ROIs) and TEP peaks, and (iii) determine the minimal number of TEP pulses for achieving reliability.

Methods

TEPs resulting from stimulation of the left dorsolateral prefrontal cortex were collected on two separate days in sixteen healthy participants. TEP peak amplitudes were compared between alternating trials, split-halves of the same run, two runs five minutes apart and two runs on separate days. Reliability was quantified using concordance correlation coefficient (CCC) and smallest detectable change (SDC).

Results

Substantial concordance was achieved in prefrontal electrodes at 40 and 60?ms, centroparietal and left parietal ROIs at 100?ms, and central electrodes at 200?ms. Minimum SDC was found in the same regions and peaks, particularly for the peaks at 100 and 200?ms. CCC, but not SDC, reached optimal values by 60–100 pulses per run with saturation beyond this number, while SDC continued to improve with increased pulse numbers.

Conclusion

TEPs were robust and reliable, requiring a relatively small number of trials to achieve stability, and are thus well suited as outcomes in clinical biomarker or interventional studies.  相似文献   

14.
目的在累及运动区的胶质瘤切除术中.利用直接皮质刺激产生的运动诱发电位(MEP)去判断运动传导通路纤维的数量和功能,并分析其变化和术后病人四肢运动功能的关系。方法对42例累及运动区的胶质瘤病人.术中利用微弱电流直接刺激运动区皮质并记录产生的运动诱发电位,比较肿瘤切除前、中、后MEP的变化,分析肿瘤切除后MEP下降程度和术后3个月四肢运动功能的关系。结果切瘤后MEP较切瘤前波幅下降50%以上26例,其中出现严重运动功能障碍17例(65.4%).轻度运动功能障碍9例(34.5%);MEP下降50%以下16例,其中出现严重运动功能障碍2例(1.3%),轻度运动功能障碍10例(62.5%).基本正常4例(25.0%)。两组严重运动功能障碍经Х^2检验,P〈0.05,差异有统计学意义。结论术中行直接皮质刺激运动诱发电位监测可直接反映运动传导纤维的数量和功能,预测术后肢体运动情况。MEP波幅下降50%可作为将发生严重运动功能障碍的临界警戒点.  相似文献   

15.
经颅磁刺激是一种无创性神经电生理学技术,经颅磁刺激运动诱发电位已广泛应用于运动皮质兴奋性与皮质延髓束、皮质脊髓束传导功能的评价。近年随着对磁刺激原理的深入了解和刺激线圈、刺激模式的不断多样化,经颅磁刺激在神经病学临床诊断中的应用不断拓展,逐渐形成更加科学和标准化的运动诱发电位操作流程。本文拟对诊断性经颅磁刺激常规刺激模式研究进展、特殊模式刺激方案,以及经颅磁刺激与脑电图、f MRI的联合应用进行综述。  相似文献   

16.
Abstract

There is growing interest and need to monitor reliably both motor (MEP) and somatosensory (SEP) evoked potentials under anesthesia. On a pre-established primate model, the present study examined the effect of incremental etomidate (ET) dosages on spinal neural MEPs to transcranial magnetic stimulation (TMS) and posterior tibial rate (PTN) SEPs. Through a small thoracic Tl 1-T12 laminotomy, an insulated double bipolar electrode was inserted epidurally in seven cynomolgus monkeys. Spinal TMS-MEPs, PTN-SEPs, and frontal EEC were tested against graded increase of ET doses. Etomidate 0.5 mg kg-1 i.v. was initially given and followed by 30 min continuous infusion of 0.01 mg kg^1 min~1, 0.018, 0.032, 0.056, 0.1, and 0.18 mg kg'1 min"1 in that order. Measurable spinal MEPs and SEPs were recorded under deep ET anesthesia (total 12.38 mg kg-1 cumulative dose over 180 min). The EEC showed marked slow wave and graded burst suppression at cumulative dose of ^3.14 mg kg~'. The direct (D) and subsequent initial indirect (I) waves (Ij, l2,13) were reproducible at doses <0.18 mg kg~7 min~1 infusion. The latter l-waves (l4 and l5) showed graded loss at infusion dosage 0.056 mg kg'1 min~1. Etomidate remains an anesthetic of attractive features in neuroanesthesia. In the primate model, neural MEPs-SEPs were reproducible despite the exceedingly high dose of ET and markedly depressed EEC. Moreover, MEP-SEP can be monitored during ET burst-suppressive neuroprotective state. The study may set a model in humans for intra-operative multi-modality neurophysiologic recording under ET-based anesthesia. [Neurol Res 1999; 21: 714-7201  相似文献   

17.
18.
This article reviews intraoperative transcranial electrical stimulation (TES) motor evoked potential (MEP) monitoring safety based on comparison with other clinical and experimental brain stimulation methods and clinical experience in more than 15000 cases. Comparative analysis indicates that brain damage and kindling are highly unlikely. There have been remarkably few adverse events. Pulse train TES-induced or coincidental seizures (n = 5) are rare, probably because of very brief (<0.03 second) stimuli, anesthesia, and the general absence of predisposing cerebral conditions. Soft bite blocks may prevent tongue or lip laceration (n = 29) or mandibular fracture (n = 1). Rare cardiac arrhythmia (n = 5) and intraoperative awareness (n = 1) may be coincidental. Minor scalp burns (n = 2) are rare. Although possible, no spinal epidural recording electrode complications or injuries resulting from TES-induced movement were found. There have been no recognized adverse neuropsychological effects, headaches, or endocrine disturbances. Comprehensive relative contraindications include epilepsy, cortical lesions, convexity skull defects, raised intracranial pressure, cardiac disease, proconvulsant medications or anesthetics, intracranial electrodes, vascular clips or shunts, and cardiac pacemakers or other implanted biomedical devices. Otherwise unexplained intraoperative seizures and possibly arrhythmias are indications to abort TES. With appropriate precautions in expert hands, the well-established benefits of TES MEP monitoring decidedly outweigh the associated risks.  相似文献   

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