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The predictive value of intraoperative facial motor evoked potentials in cerebellopontine angle tumor surgery 小脑角肿瘤手术中术中面部运动诱发电位的预测价值
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-06 DOI: 10.1016/j.clinph.2024.07.021

Objective

Our aim is to explore the value of intraoperative facial motor evoked potentials (FMEP) for facial outcomes in cerebellopontine angle (CPA) tumor surgery to provide an evidence-based consensus standard for future clinical practice and prospective studies.

Methods

Electronic databases were searched from inception to June 2023. Study quality was assessed with the QUADAS-2 tool. Bivariate and random-effects models for meta-analysis and meta-regression generated summary receiver operating characteristic curves (ROC) and forest plots for estimates of sensitivity and specificity.

Results

We included 17 studies (1,206 participants). Sensitivity was lower in the immediate (IM) post-operative (0.76, 95% CI 0.65–0.84) compared to follow-up (FU) period (0.82, 95% CI 0.74–0.88) while specificity was similar in both groups (IM, 0.94, 95% CI 0.89–0.97; FU, 0.93, 95% CI 0.87–0.96). Data driven estimates improved FMEP performance but require confirmation from future studies. Amplitude cutoff criteria and studies that scored new deficits as worse than House-Brackmann (HB) grade 2 yielded best sensitivities.

Conclusions

FMEP demonstrated statistically significant accuracy for facial function monitoring. Implementation of FMEPs varied widely across studies.

Significance

Our study is the first systematic review with meta-analysis to demonstrate that intraoperative FMEP is valuable in CPA tumor surgery for facial outcomes. Meta-regression identified the methods that were most useful in the application of FMEPs.

目的我们的目的是探讨术中面部运动诱发电位(FMEP)对小脑脑角(CPA)肿瘤手术面部预后的价值,为未来的临床实践和前瞻性研究提供基于证据的共识标准。使用 QUADAS-2 工具评估研究质量。用于荟萃分析和荟萃回归的双变量和随机效应模型生成了接收器操作特征曲线(ROC)汇总表和森林图,用于估计灵敏度和特异性。与随访期(FU)(0.82,95% CI 0.74-0.88)相比,术后即刻(IM)的灵敏度较低(0.76,95% CI 0.65-0.84),而两组的特异性相似(IM,0.94,95% CI 0.89-0.97;FU,0.93,95% CI 0.87-0.96)。数据驱动的估计值提高了 FMEP 的性能,但还需要未来研究的证实。振幅截断标准和将新的功能障碍评定为差于 House-Brackmann (HB) 2 级的研究产生了最佳灵敏度。意义我们的研究是第一项通过荟萃分析证明术中 FMEP 对 CPA 肿瘤手术面部结果有价值的系统性综述。元回归确定了在应用 FMEPs 时最有用的方法。
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引用次数: 0
An approach to the detection of pain from autonomic and cortical correlates 从自律神经和大脑皮层相关因素检测疼痛的方法
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-05 DOI: 10.1016/j.clinph.2024.07.018

Objective

To assess the value of combining brain and autonomic measures to discriminate the subjective perception of pain from other sensory-cognitive activations.

Methods

20 healthy individuals received 2 types of tonic painful stimulation delivered to the hand: electrical stimuli and immersion in 10 Celsius degree (°C) water, which were contrasted with non-painful immersion in 15 °C water, and stressful cognitive testing. High-density electroencephalography (EEG) and autonomic measures (pupillary, electrodermal and cardiovascular) were continuously recorded, and the accuracy of pain detection based on combinations of electrophysiological features was assessed using machine learning procedures.

Results

Painful stimuli induced a significant decrease in contralateral EEG alpha power. Cardiac, electrodermal and pupillary reactivities occurred in both painful and stressful conditions. Classification models, trained on leave-one-out cross-validation folds, showed low accuracy (61–73%) of cortical and autonomic features taken independently, while their combination significantly improved accuracy to 93% in individual reports.

Conclusions

Changes in cortical oscillations reflecting somatosensory salience and autonomic changes reflecting arousal can be triggered by many activating signals other than pain; conversely, the simultaneous occurrence of somatosensory activation plus strong autonomic arousal has great probability of reflecting pain uniquely.

Significance

Combining changes in cortical and autonomic reactivities appears critical to derive accurate indexes of acute pain perception.

方法 20 名健康人的手部接受了两种类型的强直性疼痛刺激:电刺激和浸泡在 10 摄氏度 (°C) 的水中,这与浸泡在 15 摄氏度水中的非疼痛刺激和压力认知测试形成了鲜明对比。连续记录高密度脑电图(EEG)和自律神经测量(瞳孔、电皮和心血管),并使用机器学习程序评估基于电生理特征组合的疼痛检测的准确性。在疼痛和应激条件下都会出现心脏、皮肤和瞳孔反应。在留一交叉验证褶皱上训练的分类模型显示,皮层和自律神经特征单独使用的准确率较低(61%-73%),而两者结合使用则可显著提高准确率,在单个报告中达到 93%。结论反映躯体感觉显著性的皮层振荡变化和反映唤醒的自律神经变化可由疼痛以外的许多激活信号触发;相反,同时出现躯体感觉激活和强烈的自律神经唤醒很有可能是对疼痛的唯一反映。
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引用次数: 0
Novel and reappraised wide-band EEG findings in migraineurs: Its correlation with several clinical variables 偏头痛患者新发现并重新评估的宽波段脑电图:与多个临床变量的相关性
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-02 DOI: 10.1016/j.clinph.2024.07.020

Objective

Cortical spreading depolarization is one possible pathogenesis of migraine, of which slow neurophysiological change is barely recorded in conventional EEG settings. Using wide-band EEG conditions, we reappraised the features of EEG in migraineurs, including subdelta-band EEG changes.

Methods

This retrospective study included 144 patients with migraine. We delineated EEG of focal delta slow (FDS) (1–4 Hz) by time constant (TC) 0.3 s and focal subdelta slow (FSDS) (< 1 Hz) by TC 2 s. Relationships between clinical variables and EEG findings were evaluated.

Results

Of 144 patients, 39 had aura and 105 did not. FSDS and FDS were observed in 38 and 58 patients, respectively. No EEG was recorded during the aura. In multivariate analysis with the phase of migraine, family history, age, and percentage of sleep during EEG recording, the phase of migraine was related to the occurrence of FSDS (postdrome vs interictal, prodrome, and headache respectively (OR = 49.00 [95% CI = 3.89–616.66], 46.28 [2.99–715.78], 32.79 [2.23–481.96], p = 0.0026, 0.0061, 0.011). FDS was clinically unremarkable for differential evaluation.

Conclusions

Wide-band EEG abnormality in migraineurs, i.e., FSDS, can be affected by migraine phase.

Significance

Wide-band EEG finding could be a biomarker related to clinical variables in migraines.

目的皮层扩散性去极化是偏头痛可能的发病机制之一,在传统的脑电图设置中几乎记录不到这种缓慢的神经生理变化。利用宽波段脑电图条件,我们重新评估了偏头痛患者的脑电图特征,包括δ下波段脑电图变化。我们用时间常数(TC)0.3 秒和时间常数(TC)2 秒划分了局灶δ慢(FDS)(1-4 Hz)和局灶δ下慢(FSDS)(< 1 Hz)的脑电图。分别有 38 名和 58 名患者出现 FSDS 和 FDS。在先兆期间没有记录到脑电图。在与偏头痛的阶段、家族史、年龄和脑电图记录期间的睡眠百分比进行的多变量分析中,偏头痛的阶段与FSDS的发生有关(分别为发作后与发作间期、前驱期和头痛(OR = 49.00 [95% CI = 3.89-616.66], 46.28 [2.99-715.78], 32.79 [2.23-481.96], p = 0.0026, 0.0061, 0.011)。结论偏头痛患者的宽波段脑电图异常(即 FSDS)可能受偏头痛阶段的影响。
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引用次数: 0
Perceptual anchoring: Children with dyslexia benefit less than controls from contextual repetitions in speech processing 知觉锚定:有阅读障碍的儿童在语音处理过程中从上下文重复中获得的益处比对照组少
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-02 DOI: 10.1016/j.clinph.2024.07.016

Objectives

Individuals with dyslexia perceive and utilize statistical features in the auditory input deficiently. The present study investigates whether affected children also benefit less from repeating context tones as perceptual anchors for subsequent speech processing.

Methods

In an event-related potential study, eleven-year-old children with dyslexia (n = 21) and without dyslexia (n = 20) heard syllable pairs, with the first syllable either receiving a constant pitch (anchor) or variable pitch (no-anchor), while second syllables were identical across conditions.

Results

Children with and without dyslexia showed smaller auditory P2 responses to constant-pitch versus variable-pitch first syllables, while only control children additionally showed smaller N1 and faster P1 responses. This suggests less automatic processing of anchor repetitions in dyslexia. For the second syllables, both groups showed faster P2 responses following anchor than no-anchor first syllables, but only controls additionally showed smaller P2 responses.

Conclusions

Children with and without dyslexia show differences in anchor effects. While both groups seem to allocate less attention to speech stimuli after contextual repetitions, children with dyslexia display less facilitation in speech processing from acoustic anchors.

Significance

Altered anchoring in the linguistic domain may contribute to the difficulties of individuals with dyslexia in establishing long-term representations of speech.

目标阅读障碍患者对听觉输入中的统计特征的感知和利用不足。方法在一项事件相关电位研究中,有阅读障碍的 11 岁儿童(n = 21)和无阅读障碍的儿童(n = 20)听到了音节对,其中第一个音节接受恒定音高(锚)或可变音高(无锚),而第二个音节在不同条件下是相同的。结果诵读困难儿童和无诵读困难儿童对恒定音高和可变音高的第一个音节都表现出较小的听觉 P2 反应,只有对照组儿童额外表现出较小的 N1 反应和较快的 P1 反应。这表明阅读障碍儿童对锚重复的自动处理较少。对于第二个音节,两组儿童在锚定后都表现出比无锚定第一音节更快的 P2 反应,但只有对照组儿童额外表现出更小的 P2 反应。有阅读障碍的儿童和无阅读障碍的儿童在锚定效应方面表现出差异。虽然两组儿童在情境重复后对语音刺激的注意力分配似乎都较少,但有阅读障碍的儿童在语音处理过程中表现出的声学锚定促进作用较小。
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引用次数: 0
Early automated classification of neonatal hypoxic-ischemic encephalopathy − An aid to the decision to use therapeutic hypothermia 新生儿缺氧缺血性脑病的早期自动分类--辅助治疗性低温疗法的决策。
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-02 DOI: 10.1016/j.clinph.2024.07.015

Objective

The study aimed to address the challenge of early assessment of neonatal hypoxic-ischemic encephalopathy (HIE) severity to identify candidates for therapeutic hypothermia (TH). The objective was to develop an automated classification model for neonatal EEGs, enabling accurate HIE severity assessment 24/7.

Methods

EEGs recorded within 6 h of life after perinatal anoxia were visually graded into 3 severity groups (HIE French Classification) and quantified using 6 qEEG markers measuring amplitude, continuity and frequency content. Machine learning models were developed on a dataset of 90 EEGs and validated on an independent dataset of 60 EEGs.

Results

The selected model achieved an overall accuracy of 80.6% in the development phase and 80% in the validation phase. Notably, the model accurately identified 28 out of 30 children for whom TH was indicated after visual EEG analysis, with only 2 cases (moderate EEG abnormalities) not recommended for cooling.

Conclusions

The combination of clinically relevant qEEG markers led to the development of an effective automated EEG classification model, particularly suited for the post-anoxic latency phase. This model successfully discriminated neonates requiring TH.

Significance

The proposed model has potential as a bedside clinical decision support tool for TH.

研究目的该研究旨在解决早期评估新生儿缺氧缺血性脑病(HIE)严重程度以确定治疗性低温(TH)候选者这一难题。研究目的是为新生儿脑电图建立一个自动分类模型,以便全天候准确评估缺氧缺血性脑病的严重程度:围产期缺氧后 6 小时内记录的脑电图被目测分为 3 个严重程度组(HIE 法国分类),并使用测量振幅、连续性和频率内容的 6 个 qEEG 标记进行量化。在一个包含 90 个脑电图的数据集上开发了机器学习模型,并在一个包含 60 个脑电图的独立数据集上进行了验证:所选模型在开发阶段的总体准确率为 80.6%,在验证阶段的准确率为 80%。值得注意的是,在对 30 名儿童进行可视脑电图分析后,该模型准确识别了其中 28 名儿童的 TH 指征,只有 2 例(中度脑电图异常)不建议降温:结合临床相关的 qEEG 标记,开发出了一种有效的自动脑电图分类模型,尤其适用于缺氧后的潜伏期。该模型成功区分了需要 TH 的新生儿:意义:所提出的模型有望成为 TH 的床旁临床决策支持工具。
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引用次数: 0
Comparative assessment of MScanFit MUNE and quantitative EMG in amyotrophic lateral sclerosis diagnosis: A prospective study MScanFit MUNE 和定量肌电图在肌萎缩性脊髓侧索硬化症诊断中的比较评估:前瞻性研究。
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-02 DOI: 10.1016/j.clinph.2024.07.017

Objective

Motor Unit Number Estimation (MUNE) techniques are crucial in assessing lower motor neuron loss. MScanFit MUNE (MScanFit) is a novel tool which estimates MUNE values from compound muscle action potential (CMAP) scans by considering the probabilistic nature of motor unit firing. We conducted a prospective study to evaluate the diagnostic utility of MScanFit compared to quantitative electromyography (qEMG) in ALS patients.

Methods

We enrolled 35 patients diagnosed with amyotrophic lateral sclerosis (ALS) and 14 healthy controls, assessing qEMG and MScanFit MUNE in abductor pollicis brevis, abductor digiti minimi and tibialis anterior muscles.

Results

We found higher sensitivity of qEMG in detecting abnormalities compared to MScanFit, with a high concordance rate between the two techniques. Notably, a few muscles exhibited abnormal MUNE but normal qEMG findings, suggesting a potential complementary role for MScanFit in ALS diagnosis. Neurophysiological parameters from MScanFit showed good correlations with qEMG measures. Subclinical neurophysiological involvement was observed in muscles with normal strength, emphasizing the importance of sensitive diagnostic tools.

Conclusion

MScanFit demonstrated validity in distinguishing ALS patients from healthy subjects and correlated well with qEMG parameters.

Significance

Our study confirmed the diagnostic utility of MScanFit MUNE in ALS, highlighting its role as a supplementary diagnostic tool.

目的:运动单位数量估算(MUNE)技术对于评估下运动神经元损失至关重要。MScanFit MUNE(MScanFit)是一种新型工具,它通过考虑运动单位发射的概率性质,从复合肌肉动作电位(CMAP)扫描中估算出运动单位数。我们开展了一项前瞻性研究,评估 MScanFit 与定量肌电图(qEMG)相比在 ALS 患者中的诊断效用:我们招募了 35 名确诊为肌萎缩性脊髓侧索硬化症(ALS)的患者和 14 名健康对照者,评估了他们的肌电图(qEMG)和 MScanFit MUNE 在拇趾外展肌、趾外展肌和胫骨前肌中的应用:我们发现,与 MScanFit 相比,qEMG 检测异常的灵敏度更高,两种技术的吻合率也很高。值得注意的是,有几块肌肉的 MUNE 结果显示异常,但 qEMG 结果显示正常,这表明 MScanFit 在 ALS 诊断中具有潜在的补充作用。MScanFit 的神经电生理参数与 qEMG 测量结果显示出良好的相关性。在力量正常的肌肉中观察到了亚临床神经电生理受累,这强调了灵敏诊断工具的重要性:结论:MScanFit 在区分 ALS 患者和健康受试者方面具有有效性,并与 qEMG 参数具有良好的相关性:我们的研究证实了 MScanFit MUNE 对 ALS 的诊断效用,突出了其作为辅助诊断工具的作用。
{"title":"Comparative assessment of MScanFit MUNE and quantitative EMG in amyotrophic lateral sclerosis diagnosis: A prospective study","authors":"","doi":"10.1016/j.clinph.2024.07.017","DOIUrl":"10.1016/j.clinph.2024.07.017","url":null,"abstract":"<div><h3>Objective</h3><p>Motor Unit Number Estimation (MUNE) techniques are crucial in assessing lower motor neuron loss. MScanFit MUNE (MScanFit) is a novel tool which estimates MUNE values from compound muscle action potential (CMAP) scans by considering the probabilistic nature of motor unit firing. We conducted a prospective study to evaluate the diagnostic utility of MScanFit compared to quantitative electromyography (qEMG) in ALS patients.</p></div><div><h3>Methods</h3><p>We enrolled 35 patients diagnosed with amyotrophic lateral sclerosis (ALS) and 14 healthy controls, assessing qEMG and MScanFit MUNE in abductor pollicis brevis, abductor digiti minimi and tibialis anterior muscles.</p></div><div><h3>Results</h3><p>We found higher sensitivity of qEMG in detecting abnormalities compared to MScanFit, with a high concordance rate between the two techniques. Notably, a few muscles exhibited abnormal MUNE but normal qEMG findings, suggesting a potential complementary role for MScanFit in ALS diagnosis. Neurophysiological parameters from MScanFit showed good correlations with qEMG measures. Subclinical neurophysiological involvement was observed in muscles with normal strength, emphasizing the importance of sensitive diagnostic tools.</p></div><div><h3>Conclusion</h3><p>MScanFit demonstrated validity in distinguishing ALS patients from healthy subjects and correlated well with qEMG parameters.</p></div><div><h3>Significance</h3><p>Our study confirmed the diagnostic utility of MScanFit MUNE in ALS, highlighting its role as a supplementary diagnostic tool.</p></div>","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141912092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corollary discharge and anomalous self-experiences in schizophrenia and bipolar disorder: A specificity analysis 精神分裂症和双相情感障碍中的必然放电和异常自我体验:特异性分析。
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-08-02 DOI: 10.1016/j.clinph.2024.07.014

Objective

The Corollary Discharge (CD) mechanism inhibits self-generated speech sound perception, appearing disrupted in schizophrenia and potentially contributing to Anomalous Self-Experiences (ASEs). However, it remains unclear if this alteration and its correlation with ASEs extend to other psychotic disorders.

Methods

Electroencephalography was used to study the N1 Event-Related Potential (ERP) as an index of CD-mediated suppression in the auditory cortex across thirty-five participants with schizophrenia, twenty-six with bipolar disorder, and thirty healthy controls. Auditory N1 was elicited by two conditions: real-time listening to self-pronounced vowels while speaking through connected microphone and earphones (listen/talk −or talk condition in previous literature-) and passive listening to the same previously recorded self-uttered vowels (listen/no talk −or listen condition-).

Results

N1 ERP amplitude was lower in the listen/talk condition compared to listen/no talk across all groups. However, N1 suppression was significantly reduced in schizophrenia, with bipolar patients showing intermediate attenuation between both groups (i.e., non-significantly different from controls). Furthermore, N1 suppression inversely correlated with ASEs severity only in schizophrenia.

Conclusions

Dysfunction of the CD mechanism may be a defining feature of schizophrenia, where it is connected to ASEs.

Significance

These results corroborate previous findings linking auditory N1 ERP suppression with disrupted CD mechanism in schizophrenia, but not in bipolar disorder.

目的:必然放电(CD)机制可抑制自我产生的言语声音感知,在精神分裂症患者中出现紊乱,并可能导致异常自我体验(ASEs)。然而,这种改变及其与异常自我体验的相关性是否会扩展到其他精神障碍,目前仍不清楚:方法:我们使用脑电图研究了 N1 事件相关电位(ERP),作为 35 名精神分裂症患者、26 名躁郁症患者和 30 名健康对照者听觉皮层 CD 介导的抑制指数。听觉 N1 在两种条件下激发:通过连接的麦克风和耳机在说话时实时聆听自我发音的元音(聆听/说话--或以前文献中的说话条件--)和被动聆听以前录制的相同的自我发音的元音(聆听/不说话--或聆听条件--):与听/不说话条件相比,听/说话条件下各组的 N1 ERP 振幅都较低。然而,精神分裂症患者的 N1 抑制明显降低,双相情感障碍患者的 N1 抑制在两组患者中处于中间水平(即与对照组无显著差异)。此外,只有精神分裂症患者的N1抑制与ASEs的严重程度成反比:结论:CD机制的功能障碍可能是精神分裂症的一个决定性特征,它与ASEs有关:这些结果证实了之前的研究结果,即在精神分裂症中,听觉 N1 ERP 抑制与 CD 机制紊乱有关,而在躁狂症中则无关。
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引用次数: 0
Polysomnographic features prior to dream enactment behaviors in isolated rapid eye movement sleep behavior disorder 孤立性快速眼动睡眠行为障碍患者做梦前的多导睡眠图特征。
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-07-31 DOI: 10.1016/j.clinph.2024.07.013

Objective

This study aimed to identify electroencephalogram correlates of dream enactment behaviors (DEBs) and elucidate their cortical dynamics in patients with isolated/idiopathic rapid eye movement (REM) sleep behavior disorder (iRBD).

Methods

This cross-sectional study included 15 patients with iRBD. Two REM sleep periods in routine polysomnography were compared: the 60 s preceding the DEBs (“pre-representative behavior” [preR]), and the 60 s with the least submental electromyogram activity (“background” [BG]). Six EEG frequency bands and electrooculogram were analyzed; power spectra, coherence and phase-locking values in four 15-s periods were examined to assess trends. These indices were also compared between preR and BG.

Results

Compared with BG, significantly higher delta power in the F3 channel and gamma power in the F4 and O2 channels were observed during preR. For functional connectivity, the widespread beta-band connectivity was significantly increased during preR than BG.

Conclusion

Before notable REM sleep behaviors, uneven distributed higher EEG spectral power in both very low and high frequencies, and increased wide-range beta band functional connectivity, were observed over 60 s, suggesting cortical correlates to subsequent DEBs.

Significance

This study may shed light on the pathological mechanisms underlies RBD through the routine vPSG analysis, leading to detection of DEBs.

研究目的本研究旨在识别脑电图与做梦行为(DEB)的相关性,并阐明孤立性/特发性快速眼动(REM)睡眠行为障碍(iRBD)患者大脑皮层的动态变化:这项横断面研究包括15名iRBD患者。方法:这项横断面研究纳入了 15 名 iRBD 患者,对常规多导睡眠图中的两个快速眼动睡眠期进行了比较:DEBs 之前的 60 秒("前表现行为"[pre-R])和门下肌电图活动最少的 60 秒("背景"[BG])。对六个脑电图频段和脑电图进行了分析;对四个 15 秒周期的功率谱、相干性和锁相值进行了检查,以评估趋势。这些指数还在 PR 和 BG 之间进行了比较:结果:与 BG 相比,前 R 期间 F3 通道的 delta 功率以及 F4 和 O2 通道的 gamma 功率明显更高。在功能连通性方面,preR期间广泛的β波段连通性明显高于BG期间:结论:在明显的快速眼动睡眠行为之前,60 秒内观察到分布不均的极低频和高频较高的脑电图频谱功率,以及范围广泛的 beta 波段功能连接性增加,这表明大脑皮层与随后的 DEBs 相关:本研究可通过常规 vPSG 分析揭示 RBD 的病理机制,从而发现 DEBs。
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引用次数: 0
Cortical and subcortical intraoperative-monitoring of the visual pathway under general anesthesia in epilepsy surgery 癫痫手术全身麻醉下视觉通路的皮层和皮层下术中监测
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-07-26 DOI: 10.1016/j.clinph.2024.07.011

Objective

The purpose of this study was to evaluate the applicability of visual evoked potentials (VEP) for intraoperative visual pathway monitoring in epilepsy surgery of the posterior hemispheric quadrant (PHQ) and to correlate it with post-operative visual field status.

Methods

VEP monitoring was performed in 16 patients (12 females, 7 children). Flash-induced VEP were recorded with strip electrodes from the banks of the calcarine cortex. Latency and amplitude of the first component of VEP (V1-lat, V1-amp) were monitored. Evaluation of the visual field was performed pre- and post-operatively in all patients.

Results

All procedures were successfully completed without adverse events.

In 10 patients the strip covered both the inferior and superior calcarine banks, while only one bank was sampled in 6 cases (inferior in 4, superior in 2). Considering one of the two calcarine banks, at the end of the resection VEP had disappeared in 4 patients, whereas a decrease >33.3% in 4 and <20% of V1-amp was recorded in 5 and in 4 cases respectively. The percentage of V1-amp reduction was significantly higher for the patients who experienced a post-operative visual field reduction (p < 0.001). Post-operative visual field deficits were found in patients presenting a reduction >33.3% of V1-amp.

Conclusions

VEP monitoring is possible and safe in epilepsy surgery under general anesthesia.

Significance

Intraoperative recording of VEP from the banks of the calcarine cortex allows monitoring the integrity of post-geniculate visual pathways during PHQ resections for epilepsy and it is pivotal to prevent disabling visual field defects, including hemianopia and inferior quadrantanopia.

本研究旨在评估视觉诱发电位(VEP)在后半球象限(PHQ)癫痫手术中用于术中视觉通路监测的适用性,并将其与术后视野状态相关联。方法对 16 名患者(12 名女性和 7 名儿童)进行了 VEP 监测,使用来自钙皮层的条状电极记录闪光诱发的 VEP。监测 VEP 第一分量(V1-lat、V1-amp)的延迟和振幅。结果 所有手术均顺利完成,无不良事件发生。10 例患者的条状电极覆盖了下侧和上侧钙皮层,而 6 例患者只取样了一个钙皮层(4 例为下侧,2 例为上侧)。考虑到两个钙库中的一个,在切除术结束时,4 例患者的 VEP 消失,而 5 例和 4 例患者的 V1-amp 分别下降了 33.3% 和 20%。术后视野缩小的患者 V1-amp 缩小的百分比明显更高(p <0.001)。结论VEP监测在全身麻醉下的癫痫手术中是可行且安全的。意义在PHQ癫痫切除术中,术中记录来自钙皮质库的VEP可以监测源小脑后视觉通路的完整性,这对于预防致残性视野缺损(包括偏盲和下象限失明)至关重要。
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引用次数: 0
Cortical tracking of language structures: Modality-dependent and independent responses 大脑皮层跟踪语言结构:依赖于模式的反应和独立反应
IF 3.7 3区 医学 Q1 CLINICAL NEUROLOGY Pub Date : 2024-07-26 DOI: 10.1016/j.clinph.2024.07.012

Objectives

The mental parsing of linguistic hierarchy is crucial for language comprehension, and while there is growing interest in the cortical tracking of auditory speech, the neurophysiological substrates for tracking written language are still unclear.

Methods

We recorded electroencephalographic (EEG) responses from participants exposed to auditory and visual streams of either random syllables or tri-syllabic real words. Using a frequency-tagging approach, we analyzed the neural representations of physically presented (i.e., syllables) and mentally constructed (i.e., words) linguistic units and compared them between the two sensory modalities.

Results

We found that tracking syllables is partially modality dependent, with anterior and posterior scalp regions more involved in the tracking of spoken and written syllables, respectively. The cortical tracking of spoken and written words instead was found to involve a shared anterior region to a similar degree, suggesting a modality-independent process for word tracking.

Conclusion

Our study suggests that basic linguistic features are represented in a sensory modality-specific manner, while more abstract ones are modality-unspecific during the online processing of continuous language input.

Significance

The current methodology may be utilized in future research to examine the development of reading skills, especially the deficiencies in fluent reading among those with dyslexia.

方法 我们记录了暴露于随机音节或三音节实词的听觉和视觉流中的参与者的脑电图(EEG)反应。结果我们发现,对音节的追踪部分依赖于模式,头皮前区和后区分别更多地参与了对口语和书面音节的追踪。结论我们的研究表明,在对连续语言输入进行在线处理的过程中,基本的语言特征是以感觉模式特异性的方式表现出来的,而更抽象的语言特征则是非模式特异性的。
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引用次数: 0
期刊
Clinical Neurophysiology
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