涉及中央区难治性癫痫的外科治疗

目的探讨涉及中央区难治性癫痫的手术治疗。方法3例患者术前除常规致痫灶评估外,还应用fMRI作皮质功能区定位。术中通过皮层EEG（ECoG）对致痫灶定位,通过皮层诱发电位（SEP）及皮质电刺激定位脑功能区,对位于功能区以外的致痫灶行切除性手术,功能区内的致痫灶行软脑膜下横行纤维切断术。结果术后无神经功能障碍,术后3月,2例病人无癫痫发作,1例偶有部分性发作;术后8月,1例无发作,1例偶有部分性发作,1例减少75%发作。结论术前功能区评估、术中电生理监测有助于保护皮质重要功能和提高手术癫痫控制率。     

皮层切除术在治疗伴有原发性脑穿通畸形难治性癫痫的初步应用

目的通过埋藏皮层电极监测脑电,结合皮层电刺激、影像融合技术探讨皮层切除治疗伴原发性脑穿通畸形难治性癫痫的有效性及安全性。方法通过对2例伴有原发性脑穿通畸形难治性癫痫患者埋藏皮层电极,行皮层脑电监测及皮层电刺激定位致痫灶、病灶周围功能区。神经导航系统融合头颅CT、MRI影像,三维可视化致痫灶与脑穿通畸形囊解剖关系,第二次手术行致痫性皮层切除术。结果2例患者均成功埋藏皮层电极,皮层脑电图监测捕获惯常发作,皮层电极准确定位致痫灶、功能区,将多层次数据成功融合。2例患者均成功接受致痫性皮层切除术,1例患者术后随访1年至今,未出现痫性发作（Engle评级I级）,另1例患者术后随访1．5年至今,痫性发作持续时间及频率显著减少（Engle评级Ⅱ级）,2例患者均未出现明显并发症。结论多手段联合运用精确定位异常放电皮层后行皮层切除术是治疗原发性脑穿通畸形合并难治性癫痫的一种有效、安全的治疗方法。     

颅内电极脑电图监测对癫痫致痫灶的定位作用

目的探讨颅内电极脑电图（EEG）监测对癫痫致痫灶的定位作用。方法对经临床、影像学和常规EEG检查不能确定致痫灶部位的20例难治性颞叶癫痫患者，应用立体定向技术，经双侧颞叶植入硬膜下条状电极进行长时间EEG监测，观察发作期及发作间期EEG变化，结合常规EEG、MRI检查结果对癫痫灶进行综合定位；术后随访，评估致痫灶定位的准确性。结果20例患者颅内电极埋藏时间为1—5d，每例监测到／〉2次临床发作并记录发作间期和发作期的异常放电活动。20例患者发作期颅内电极EEG均能准确定位，15例致痫灶发作间期与发作期一致，2例发作间期为双侧棘波，3例发作间期定位与发作期不一致。术后按Engel疗效分级：发作消失13例（65％），显著改善3例（15％），良好3例（15％），无效1例（5％）。未出现因颅内电极安置所致的并发症。结论颅内电极EEG监测可为癫痫手术治疗提供可靠的病灶定位依据。     

立体定位脑电图长程监测在顽固性癫(痫)致(痫)灶定位中的应用

目的:探讨立体定向技术植入的深部电极构成的立体定位脑电图对药物难治性癫(痫)致(痫)灶的定位阳性率和近期手术效果.方法:对于头皮脑电、CT、MRI难以确定致(痫)灶位置的药物难治性癫(痫)的10例患者,采用立体定向方法植入深部电极2根6例、3根4例,长程记录发作3次以上,结合发作间期和发作期深部电极脑电确定致(痫)灶,外科治疗后随访术后发作改善情况.结果:外科术前监测106例,实行手术33例,其中10例患者需要植入深部电极辅助定位.此10例中无植入电极并发症,均有发作间期局灶(痫)样放电和发作期局灶性起源位置,其中局灶性起源7例、区域性起源3例.参照深部电极脑电图结果采取外科手术治疗,术后9～20个月,癫(痫)缓解4例,2例好转90％以上,4例好转50％以上,无手术并发症.结论:立体定位脑电图可对头皮脑电难以确定致(痫)灶的患者进行定位,为外科提供定位性诊断信息,提高外科手术效果.     

难治性癫痫的外科治疗(附36例临床分析)

目的探讨难治性癫痫的致病灶定位和术式选择。方法回顾分析36例难治性癫痫患者的临床资料,术前均行视频脑电监测(VEEG)和CT/MR检查,结合临床症状定位致痫灶。采用颞前叶及海马、杏仁核切除+广泛致痫皮层低功率电凝热灼25例;额叶癫痫+周围皮层低功率皮层热灼术5例,病灶及周围皮层切除+低功率皮层热灼术4例,行单侧病灶切除+胼胝体前部切开+致痫皮层低功率电凝热灼2例。结果经6个月至3年的随访,满意29例,显著改善5例,良好2例。结论部分性发作的癫痫患者,最可靠的治疗方法是致痫灶的切除,但对于全面性发作的病人,其致痫区往往比较广泛而无法切除,联合皮层热灼术可以减少发作频率、减轻发作程度和改变发作形式,提高治疗效果。准确定位致病灶,选择恰当的手术方式是外科治疗难治性癫痫取得良好效果的关键。     

颅内电极监测技术在癫痫手术中的应用

目的探讨颅内电极监测技术在难治性癫痫外科治疗中的应用价值。方法对头皮脑电图及影像学等非侵袭性检查难以确定致痫灶或致痫灶与重要功能区关系密切的51例难治性癫痫患者,行颅内电极埋置术,长程视频脑电图监测确定致痫灶,并行脑皮层电刺激功能区测定,再次手术切除致痫灶。结果术后致痫灶切除效果按Engel分级：I级32例,Ⅱ级13例,Ⅲ级5例,Ⅳ级1例。术后发生头皮愈合不良3例,延长住院时间后治愈。无脑脊液漏及永久性神经功能缺失发生。结论颅内电极监测可以精确定位致痫灶,皮层电刺激术对脑功能区定位可靠、方便,故对于采用非侵袭性检查不能明确致痫灶或致痫灶与重要功能区关系密切的难治性癫痫患者,颅内电极监测结合皮层电刺激术可以提高其治愈率,并有效降低并发症发生率。     

VEEG、ECoG、结合MRS定位致痫灶评价(附23例临床分析)

目的探讨在颞叶病变继发颞叶癫痫(Temporal lobe epilepsy,TLE)患者中应用长程视频脑电图(VEEG)、颅脑磁共振波谱分析(MRS)联合皮层脑电图(ECoG综合定位致痫灶指导手术切除致痫灶范围,评价TLE术后临床效果。方法病历资料选自2016年1月至2017年12月期间在蚌埠市第三人民医院癫痫研究所就医的既往有癫痫发作临床症状及不同医院脑电图结果提示有颞叶脑电异常初步依据纳入、排除标准选取病历资料完整的23例颞叶病变继发TLE的患者行手术治疗,术前完善VEEG及MRS检查,术中联合ECoG再检测致痫灶指导手术切除范围,术后采用Engel标准评价手术效果。结果应用VEEG与MRS两种检查分别阳性对不同病因组患者致痫灶定位中,术中在ECoG再检测指导下与MRS、VEEG定位致痫灶比较,MRS与ECoG一致率为95.65%,高于VEEG与ECoG的一致率65.22%,差异有统计学意义(χ~2=6.769,P0.05);在ECoG再检测指导下手术治疗的23例继发性TLE患者,术后随访12～27个月,依据Engel评价标准,结果示:EngelⅠ级18例,EngelⅡ级3例,EngelⅢ级1例,EngelⅣ级1例,术后均无严重并发症及死亡病例,术后临床效果达到显著有效共22例,显著有效率为95.65%。结论术中联合ECoG再检测致痫灶并指导手术切除范围,可显著提高手术治疗效果,TLE患者术后显著有效达95.65%;对一般经济条件需要手术治疗的患者,术前应用MRS与VEEG综合定位致痫灶与术中联合ECoG再检测致痫灶是颞叶病变继发TLE患者一种很好的选择,可避免昂贵的检查费用,获得满意疗效。     

发作间期PET和MR海马像在难治性颞叶癫癇术前定侧中的应用

目的 探讨发作间期18FDG-PET和MR海马像在难治性颞叶癫(?)（TLE）致(?)源术前定侧中的价值。方法 对17例药物难治性TLE患者术前定侧资料及术后随诊情况进行分析。结果 本组患者中,有12例（71％）患者MR显示海马硬化（HS）,海马萎缩与信号改变常共存,T2加权像和FLAIR序列有利于显示信号的改变。HS侧多提示为致(?)源侧。PET检查均显示有至少一侧颞叶低代谢改变,并常多发或范围弥散。PET与MR的定侧准确率分别是100％（13/13）、77％（10/13）,经x2检验两者间无差异（P>0.05）。结论　18FDG-PET和MR海马像在致(?)源定侧中的作用是互补的,当颞叶低代谢侧与海马硬化侧相一致时手术效果较好。     

功能区肿瘤继发癫痫的手术治疗

目的总结我科近年来治疗功能区肿瘤继发癫痫的治疗经验,探讨功能区肿瘤继发癫痫的外科治疗原则和方法。方法对2011年5月-2013年5月在我院接受手术治疗的50例功能区肿瘤继发癫痫的患者进行回顾性分析。结果全组病例术前均行系统癫痫外科评估。其中12例行颅内电极皮层电刺激功能区定位,根据肿瘤大小和脑电图所监测到的致痫区以及皮层电刺激所确定的功能范围制定手术切除范围,术后1例出现对侧手指轻瘫,1例出现一过性对侧肢体偏瘫,1例出现一过性失语,其余术后随访无明显神经功能障碍。未行颅内埋藏电极患者38例,综合运用MRI、术中皮层脑电监测和术中B超等多种方法来确认手术切除范围,术后神经功能缺损术后加重5例,7例术后出现对侧肢体轻瘫,2例出现对侧偏麻,4例出现一过性失语。全组术后癫痫无发作达到EngelⅠ级42例（84％）。结论功能区肿瘤继发癫痫的外科治疗要兼顾肿瘤的全切、致痫灶的切除以及功能区的保护。术者的经验和熟练的显微操作是基本前提,术前综合运用多种评估方法,结合术中皮层脑电及术中B超等方法对病灶,致痫区以及功能区进行定位,对保证手术效果起重要作用。颅内埋藏电极长程脑电监测定位致痫灶,并经皮层电刺激定位功能区,可进一步明确病变与致痫灶、功能区重叠程度及毗邻关系,从而为手术切除范围的界定提供了关键信息。     

长程颅内电极记录定位致痫灶的效果分析

目的 讨论应用颅内埋藏电极进行长程视频脑电(Video-EEG)监测，对于致痫灶的定位作用。方法 应用立体定向技术，向颅内可疑部位植入深部电极和／或硬膜下条状电极。采用DaVinci系统，进行长程视频脑电监测，记录发作间期及发作期EEG变化，确定癫痫起源部位。在皮层电极脑电图(ECoG)监测下，手术切除致痫灶或行立体定向毁损术。结果 本组17例患者颅内电极埋藏时间4～17天，平均9天。各例均记录到明确的发作间期异常放电和／或发作期EEG变化。手术切除致痫灶16例(联合胼胝体切开术1例)；行双侧杏仁核毁损术1例。术后复查Vidoo-EEG，显示痫性放电基本消失15例，改善2例(集中于手术对侧1例)。按照Engel术后效果分级：Ⅰ级15例，Ⅲ级1例，Ⅳ级1例。所有病例均未出现因长时间埋藏颅内电极引起的并发症。结论 在致痫灶定位困难的难治性癫痫患者中，应用埋藏式颅内深部电极和／或硬膜下条状电极，进行长程颅内电极记录，可以精确定位致痫灶，可改变外科治疗计划，从而提高了癫痫的治愈率及手术成功率。     

Hypersalivation in temporal lobe epilepsy

PURPOSE: We sought to determine whether hypersalivation helps lateralize seizure onset during complex partial seizures of temporal lobe origin. Several clinical signs, which help lateralize seizure onset, have been reported in temporal lobe epilepsy (TLE). Increased salivation only occasionally has been reported as a manifestation of partial epilepsy. METHODS: Of 590 consecutive patients admitted for video-EEG monitoring, either as a part of a presurgical evaluation of medically intractable epilepsy or for diagnosis and clarification of their paroxysmal symptoms, we identified 10 patients with ictal hypersalivation as a prominent manifestation of complex partial seizures. We reviewed the clinical features, scalp-sphenoidal video-EEG monitoring, intracarotid amytal (Wada) testing, hippocampal volumetric magnetic resonance imaging (MRI), and fluorodeoxyglucose-positron emission tomography (FDG-PET) scans of these patients. RESULTS: Of the 10 patients with ictal hypersalivation, seven patients had nondominant/right TLE, and three patients had dominant/left TLE. All patients had hippocampal atrophy on volumetric MRI. Eight of the 10 patients underwent standard temporal lobectomy with amygdalohippocampectomy (six right, two left). All of the operated-on patients had a seizure-free (Engel class I) outcome, and their increased salivation resolved. Two patients, who did not undergo surgical treatment, continue to have complex partial seizures with increased salivation. CONCLUSIONS: We conclude that increased salivation as a prominent ictal finding in complex partial seizures of temporal lobe origin is more likely to be of nondominant temporal lobe origin. Further studies with larger numbers of patients are needed to replicate this finding.     

Daytime outpatient versus inpatient video-EEG monitoring for presurgical evaluation in temporal lobe epilepsy.

Video-EEG monitoring documentation of seizure localization is one of the most important aspects of a presurgical investigation in refractory temporal lobe epilepsy (TLE) patients. The objective of this study was to evaluate the efficacy of inpatient versus daytime outpatient telemetry. The authors evaluated prospectively 73 patients with medically intractable TLE. Ninety-one telemetry sessions were performed: 35 as inpatients and 56 as outpatients. Outpatient monitoring was performed in the EEG laboratory. They used 18-channel digital EEG. Medications were not changed in the outpatient group. For analysis of the data, time was counted in periods (12 hours = 1 period). Statistical analyses were performed using Student's t-test and the chi2 test. There were no differences between the two groups (outpatient versus inpatient) with respect to age and mean seizure frequency before monitoring, mean time to record the first seizure (1.1 versus 1.4 periods), mean number of seizures per period (0.6 for both groups), lateralization by interictal spiking (46% versus 57%), and lateralization by ictal EEG (59% versus 77%). Daytime outpatient video-EEG monitoring for presurgical evaluation is efficient and comparable with inpatient monitoring. Therefore, the improved cost benefit of outpatient monitoring may increase the access to surgery for individuals with intractable TLE.     

Alfentanil-induced activation: a promising tool in the presurgical evaluation of temporal lobe epilepsy patients

Pharmacologic activation of epileptic foci has been used experimentally with the hope that it may accelerate the presurgical evaluation of patients with medically intractable epilepsy. In this article, we will review the existing literature on these activating tests giving emphasis on the opioid analogs, and particularly alfentanil. Alfentanil is an opioid analog with rapid anesthetic effect, which has been known to trigger epileptiform discharges in epilepsy patients. 58 temporal lobe epilepsy (TLE) patients were studied with alfentanil activation during electrocorticography, at the Epilepsy Surgery Unit (ING, Brazil). An increase of the interictal epileptiform discharges was observed originating from hippocampal and parahippocampal regions (96.5%). To a lesser extent, alfentanil activated the basal and lateral temporal regions. Electrographic seizures were observed in 38%. In addition, we performed continuous video-EEG (VT/EEG) monitoring, with scalp and bilateral foramen ovale electrodes, in 12 TLE patients. The results of spontaneously observed seizures were compared with the electrographic changes following alfentanil activation (50–75 μg/kg, i.v.). In seven cases, alfentanil triggered focal electrographic seizures, ipsilaterally to the side generating the spontaneous seizures and in two patients it produced bilateral sequential activation of the temporal lobes. Ictal SPECTs during the alfentanil test showed hyperperfusion at the lateral temporal regions, ipsilaterally to the activated area or bilaterally. In summary, our study confirms the activating effect of alfentanil, and provides a strong evidence for its selective activating effect on the temporal lobes of TLE patients. The ictal SPECT during alfentanil activation did not offer any additional advantage for the localization of the ictal onset.     

Lateralized Postictal EEG Delta Predicts the Side of Seizure Surgery in Temporal Lobe Epilepsy

PURPOSE: The concordance of lateralized EEG postictal polymorphic delta activity (PPDA) to the side of seizure origin in temporal lobe epilepsy (TLE) has received limited study. Our objective was to study the lateralizing value of PPDA in patients with documented TLE. METHODS: A cohort of consecutive adults with TLE, detailed presurgical evaluation before temporal lobectomy, and minimal follow-up of 2 years were included. One author masked the ictal rhythm of presurgical EEGs and randomly presented 20 s of preictal and the postictal EEG to two electroencephalographers who were blind to all clinical data. They independently assigned PPDA to one of three categories: not present, bilateral, or lateralized (defined as newly appearing or an amplitude >50% of the preictal record). RESULTS: Eighty seizures from 29 patients were studied. Fifteen patients had a left, and 14 had a right temporal lobectomy. Twenty-three patients were seizure free or substantially improved (defined as simple partial or nocturnal seizures only). Lateralized PPDA was present in 64% of all EEGs and at least one record from 22 (76%) patients. Lateralized PPDA, when present, was concordant with the side of surgery in 96% of the EEGs. CONCLUSIONS: Lateralized PPDA is highly predictive of the side of ultimate temporal lobectomy, and by inference the side of seizure origin.     

Surgery for intractable epilepsy in children: pre- and perioperative evaluations with special reference to dipole tracing method estimated from interictal spike

Methods of preoperative and perioperative evaluation methods for surgical treatment of intractable epilepsy in children are described. Among non-invasive diagnostic methods, EEG-video monitoring is the most fundamental. Amygdalohippocampal volume measurement by MR was useful for the differential diagnosis of mesial temporal lobe epilepsy (TLE) from lateral TLE and generalized epilepsy. The dipole tracing method with a realistic head model was useful for identification of epileptic foci from the interictal spikes of scalp EEG, when an abnormal electric source was estimated as an equivalent current dipole (ECD) in the brain of patients with organic lesion and TLE. ECD concentration ratio ranged from 70 to 90% within 20 mm around the lesion. After lesionectomy seizures disappeared in every patient. The mean distance between the centers of the ECD and epileptic focus (identified by subdural electrode recording) was 14 mm (range: 8 to 18 mm). ECDs of mesial TLE were located in the temporal base rather than mesial temporal lobe, whereas those of lateral TLE in the lateral cortex precisely. In unilateral, intermediate and bilateral TLE, 76%, 52% and 36% of ECDs were localized in the ictal onset zone respectively (p = 0.007). Electrical cortical stimulation with chronically placed intracranial electrodes was used to accurately identify eloquent areas to avoid postsurgical complications. Immediately after operation, 10 to 20% of patients showed better or deteriorated results in neuropsychological examinations, which recovered in all patients after one year. Postoperative seizures were absent in three fourths of patients. Further efforts are needed to obtain better seizure control in future.     

Temporal lobe epilepsy with sensory aura: interictal glucose hypometabolism

Patients with mesial temporal lobe epilepsy (mTLE) exhibit marked depressions of the regional cerebral glucose metabolism (rCMRGlu) in the mesiotemporal region. We hypothesised that patients with temporal lobe epilepsy (TLE) who have a bilateral somatosensory or acoustic ( = temporolateral/SII-) aura can be differentiated from mTLE by rCMRGlu depressions primarily involving temporo-perisylvian locations. We therefore used this ictal semiology as a clinical criterion to define a subgroup of such patients and measured the rCMRGlu in 16 patients with TLE as evident from interictal and ictal EEG-video monitoring. Clinically, they presented with medically refractory complex partial seizures and were subjected to presurgical evaluation. The pattern of the interictal rCMRGlu in the TLE patients was different from that observed in patients with mTLE and showed significant depressions ipsilateral to the epileptic focus in mesial temporal and lateral temporal regions but spared the thalamus. The neocortical metabolic depressions were spatially more extended in right than in left TLE patients. Magnetic resonance images (MRI) were either normal (n = 5) or revealed unilateral or bilateral hippocampal atrophy/sclerosis (n = 7), or temporal or extratemporal focal cortical dysplasia (n = 4). The selected TLE patients presented here comprise a heterogeneous group showing most pronounced metabolic depressions in the lateral temporal cortex. Thus, our data suggest that non-invasive metabolic imaging can assist in identifying the neocortical symptomatogenic zone in putative temporo-perisylvian lobe epilepsy.     

Combining ictal surface-electroencephalography and seizure semiology improves patient lateralization in temporal lobe epilepsy

PURPOSE: The study goal was to assess the concordance of ictal surface-EEG and seizure semiology data in lateralizing intractable temporal lobe epilepsy (TLE) and to examine the benefits of the combined use of these two methods. METHODS: We independently analyzed the ictal recordings and clinical symptoms associated with 262 seizures recorded in 59 TLE patients. Each seizure was lateralized on the basis of (i) its associated ictal surface-EEG pattern according to a predefined lateralization protocol and (ii) its associated ictal and postictal seizure semiology according to strictly defined clinical criteria. Individual patients were also lateralized based on these data. RESULTS: Ictal surface-EEG findings lateralized 62.6% of seizures and 64.4% of patients. Seizure semiology findings lateralized 46.2% of seizures and 78.0% of patients. There was a high degree of concordance between lateralizations based on these two methods, for both individual seizures and individual patients. Combination of the information from the two methods allowed for lateralization in a greater proportion of both seizures (79.8%) and patients (94.9%). Combined EEG-seizure lateralization was concordant with the side of operation in 33 of 34 patients who underwent successful surgery (Engel's surgical outcome class I/II). CONCLUSIONS: In TLE, there is a high agreement between the lateralization of individual seizures and patients, which is based on ictal surface-EEG findings and seizure semiology. Furthermore, combination of these two methods improves the lateralization of individual seizures and patients. Thus, standardized combined EEG-seizure analysis is a valuable noninvasive tool in the presurgical evaluation of TLE.     

Presurgical electroencephalographic patterns and outcome from anterior temporal lobectomy.

We reviewed data from 48 patients after anterior temporal lobe resection for medically intractable epilepsy. All had ictal electro-encephalographic (EEG) evidence of unilateral temporal lobe onset. Depth electrodes were used in 19 patients. Successful surgical outcome correlated significantly with factors that suggested a temporal lobe focus, particularly in the interictal scalp EEG. The most successful outcome occurred in patients with well-localized unilateral interictal temporal spikes (100% improved). The group with well-localized bilateral temporal spikes also did well (76% improved). Patients with extratemporal spread of the interictal spike on scalp EEG, either unilaterally or bilaterally, did less well. Only one third improved, despite extensive extracranial and intracranial monitoring, when indicated. The interictal scalp EEG may be the only EEG necessary for the presurgical evaluation of selected patients with intractable temporal lobe epilepsy.     

The clinical usefulness of ictal SPECT in temporal lobe epilepsy: the lateralization of seizure focus and correlation with EEG

PURPOSE: To analyze the relationship between ictal electroencephalography (EEG) and ictal single-photon emission computed tomography (SPECT) and to evaluate the diagnostic usefulness of ictal SPECT as an independent presurgical evaluation technique. METHODS: Sixty-eight patients with temporal lobe epilepsy who underwent temporal lobectomy with good surgical outcome were included in this study. Ictal SPECT was performed during video-EEG monitoring. The ictal EEG was analyzed in 5-second intervals from the initiation of the ictal rhythm. Lateralized EEG dominance was determined by the amplitude, frequency, or regional patterns of ictal rhythm for each 5-second interval. The total ictal EEG was divided into three periods: preinjection (maximum, 30 seconds), the initial part of the postinjection period (30 seconds), and the latter part of the postinjection period (30 to 60 seconds). The results of ictal SPECT were compared with the lateralized EEG dominance of each period and at seizure onset. RESULTS: Fifty-four of 68 ictal EEGs correctly lateralized seizure focus ipsilateral to the side of surgery. Ictal SPECT correctly lateralized the epileptogenic temporal lobe in 61 of 68 patients (mean injection time, 29.8 seconds from onset). Multivariate analysis indicated that only the EEG dominance of the preejection period correlated significantly with the concordant hyperperfusion of ictal SPECT. Correct lateralization of ictal SPECT occurred in 10 of 14 patients with nonlateralized ictal EEG. CONCLUSIONS: Preinjection neuronal activity seems to be important for the accurate interpretation of the hyperperfused patterns of ictal SPECT. Ictal SPECT is an independent and confirmatory presurgical evaluation technique.