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Neurosurgical Applications of Magnetic Resonance Diffusion Tensor Imaging 磁共振弥散张量成像在神经外科中的应用
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.007.1.002
B. D. Hirsch, B. Zussman, A. Flanders, A. Sharan
Magnetic Resonance (MR) Diffusion Tensor Imaging (DTI) is a rapidly evolving technology that enables the visualization of neural fiber bundles, or white matter (WM) tracts. There are numerous neurosurgical applications for MR DTI including: (1) Tumor grading and staging; (2) Pre-surgical planning (determination of resectability, determination of surgical approach, identification of WM tracts at risk); (3) Intraoperative navigation (tumor resection that spares WM damage, epilepsy resection that spares WM damage, accurate location of deep brain stimulation structures); (4) Post-operative assessment and monitoring (identification of WM damage, identification of tumor recurrence). Limitations of MR DTI include difficulty tracking small and crossing WM tracts, lack of standardized data acquisition and post-processing techniques, and practical equipment, software, and timing considerations. Overall, MR DTI is a useful tool for planning, performing, and following neurosurgical procedures, and has the potential to significantly improve patient care. Technological improvements and increased familiarity with DTI among clinicians are next steps. Introduction Magnetic Resonance (MR) imaging uses magnetic fields to temporarily alter proton (hydrogen atom) orientation and then measures the energy emitted upon proton relaxation, enabling discrimination of tissues with different proton (water) compositions. Water molecules naturally diffuse in accordance with Brownian motion (imagine a drop of dye spreading out in a glass of water). A series of magnetic pulses can be applied to measure the inter-pulse magnitude and direction of proton diffusion. On a pixel-by-pixel basis, this diffusion is described by the Apparent Diffusion Coefficient (ADC), which can be determined in multiple axes. Mori et al1 found that application of the diffusion pulse in a minimum of six directional axes is sufficient to resolve a diffusion vector in three dimensional space describing the overall diffusion for a given pixel, called a tensor (thus the name diffusion tensor imaging (DTI)). This approach has been particularly useful in identifying myelinated axons.The term anisotropy refers to the degree by which protons diffuse predominantly in a single direction. Myelinated fibers are relatively anisotropic with diffusion preferentially along the axis of the fiber. DTI data are depicted in parametric maps that assign colors to different directions (e.g., anterior, posterior, ventral, dorsal, right, left). Thus, MR DTI visually depicts the water molecules within myelinated neurons, crudely outlining WM tracts. DTI has been validated by comparison with experimental histological specimens. Further proof of concept includes experiments where DTI-identified WM tracts were electrically stimulated and produced predicted physiologic responses. Traditionally, subcortical stimulation mapping has served as the gold standard for intraoperative neuronavigation, yet this technique does not visually deli
磁共振(MR)弥散张量成像(DTI)是一项快速发展的技术,可以实现神经纤维束或白质束的可视化。MR DTI有许多神经外科应用,包括:(1)肿瘤分级和分期;(2)术前计划(确定可切除性,确定手术入路,确定有风险的WM束);(3)术中导航(免WM损伤的肿瘤切除、免WM损伤的癫痫切除、准确定位脑深部刺激结构);(4)术后评估与监测(WM损伤的识别、肿瘤复发的识别)。MR DTI的局限性包括难以跟踪小的和交叉的WM区域,缺乏标准化的数据采集和后处理技术,以及实用的设备、软件和时间考虑。总的来说,MR DTI是计划、执行和跟踪神经外科手术的有用工具,并且具有显著改善患者护理的潜力。接下来的步骤是技术改进和临床医生对DTI的熟悉程度的提高。磁共振成像利用磁场暂时改变质子(氢原子)的取向,然后测量质子弛豫时发射的能量,从而区分不同质子(水)组成的组织。水分子按照布朗运动自然扩散(想象一滴染料在一杯水中扩散)。可以用一系列磁脉冲测量脉冲间质子扩散的幅度和方向。在逐像素的基础上,这种扩散是由表观扩散系数(ADC)来描述的,它可以在多个轴上确定。Mori等人发现,在至少六个方向轴上应用扩散脉冲足以在三维空间中解析描述给定像素的整体扩散的扩散矢量,称为张量(因此称为扩散张量成像(DTI))。这种方法在鉴别髓鞘轴突方面特别有用。各向异性一词指的是质子主要沿单一方向扩散的程度。髓鞘纤维是相对各向异性的,扩散优先沿着纤维的轴线。DTI数据在参数化图中进行描述,这些参数化图将颜色分配到不同的方向(例如,前、后、腹、背、右、左)。因此,MR DTI可以直观地描绘髓鞘神经元内的水分子,粗略地勾勒出WM束。通过与实验组织标本的比较,验证了DTI的有效性。进一步的概念验证包括实验,其中dti识别的WM束被电刺激并产生预测的生理反应。传统上,皮质下刺激作图是术中神经导航的金标准,但这种技术并不能直观地描绘脑实质内的神经束路径。相比之下,DTI描绘的是WM束在中枢神经系统中的路径。文献中描述了DTI的许多创新临床应用。在此,我们将对它们进行主题描述,并讨论其局限性和未来发展方向。肿瘤分级和分期用DTI评估肿瘤可以区分不同类型的中枢神经系统病变,WM束的可视化描述WM-肿瘤的相互作用。Lazar等2评估了6例脑病变患者的术前DTI图像,观察到肿瘤引起的各种损伤模式,包括偏离、变形、浸润或明显的束中断。术前对wm -肿瘤相互作用的了解有助于获得良好的临床结果,因为4例术前运动功能受损的患者在术后症状完全缓解。Chen等人将这一知识应用到10例脑干病变患者的研究中。在切除之前,每个患者都诊断出某种形式的偏离、变形、浸润或明显的尿道中断。手术后再次观察束确保束回到正确的位置。作者认为,WM束成像提供了丰富的危险分层和预后信息。DTI可用于评估肿瘤的特定特征,包括浸润程度。一个被称为分数各向异性(FA)的参数是一个标量值(范围从0-1),用于描述扩散过程的各向异性程度。Deng等4在20例胶质瘤患者中发现FA值与肿瘤浸润程度呈负相关,胶质瘤浸润程度高的区域FA值较低。FA是一种很有前途的肿瘤浸润的量化标记物(不能从常规的MR图像中确定)。FA值有助于区分肿瘤类型。
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引用次数: 2
Assessing a 600-mg Loading Dose of Clopidogrel 24 Hours Prior to Pipeline Embolization Device Treatment 评估管道栓塞装置治疗前24小时600mg氯吡格雷负荷剂量
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.013.2.002
E. Atallah, H. Saad, K. Bekelis, N. Chalouhi, S. Tjoumakaris, D. Hasan, H. Zarzour, Michelle J. Smith, Md Mba Facs Faha Robert H. Rosenwasswer, P. Jabbour
Background: Clopidogrel/aspirin antiplatelet therapy routinely is administered 7-10 days before pipeline aneurysm treatment. Our study assessed the safety and efficacy of a 600-mg loading dose of clopidogrel 24 hours before Pipeline Embolization Device (PED) treatment. Methods: In this retrospective cohort study, we included patients treated with PED from October 2010 to May 2016. A total of 39.7% (n = 158) of patients were dispensed a loading dose of 650 mg of aspirin plus at least 600 mg of clopidogrel 24 hours preceding PED deployment, compared to 60.3% (n = 240) of patients who received 81-325 mg of aspirin daily for 10 days with 75 mg of clopidogrel daily preprocedurally. The mean follow-up was 15.8 months (standard deviation [SD] 12.4 months). modified Rankin Scale (mRS) was registered before the discharge and at each follow-up visit. To control confounding, we used multivariable logistic regression and propensity score conditioning. Results: Of 398 patients, the proportion of female patients was ~16.5% (41/240) in both groups and shared the same mean of age ~56.46 years. ~12.2% (mean = 0.09; SD = 0.30) had a subarachnoid hemorrhage. 92% (mean = 0.29; SD = 0.70) from the pretreatment group and 85.7% (mean = 0.44; SD = 0.91) of the bolus group had a mRS ≤2. In multivariate analysis, bolus did not affect the mRS score, P = 0.24. Seven patients had a long-term recurrence, 2 (0.83%; mean = 0.01; SD = 0.10) of which from the pretreatment group. In a multivariable logistic regression, bolus was not associated with a long-term recurrence rate (odds ratio [OR] 1.91; 95% confidence interval [CI] 0.27-13.50; P = 0.52) or with thromboembolic accidents (OR 0.99; 95% CI 0.96-1.03; P = 0.83) nor with hemorrhagic events (OR 1.00; 95% CI 0.97-1.03; P = 0.99). Three patients died: one who received a bolus had an acute subarachnoid hemorrhage. The mean mortality rate was parallel in both groups ~0.25 (SD = 0.16). Bolus was not associated with mortality (OR 1.11; 95% CI 0.26-4.65; P = 0.89). The same associations were present in propensity score-adjusted models.
背景:氯吡格雷/阿司匹林抗血小板治疗通常在管道动脉瘤治疗前7-10天进行。我们的研究评估了在管道栓塞装置(PED)治疗前24小时使用600mg负荷剂量氯吡格雷的安全性和有效性。方法:在这项回顾性队列研究中,我们纳入了2010年10月至2016年5月期间接受PED治疗的患者。共有39.7% (n = 158)的患者在PED部署前24小时分配了650 mg阿司匹林和至少600 mg氯吡格雷的负荷剂量,相比之下,60.3% (n = 240)的患者在术前每天接受81-325 mg阿司匹林和75 mg氯吡格雷,持续10天。平均随访15.8个月(标准差12.4个月)。在出院前和每次随访时登记改良Rankin量表(mRS)。为了控制混杂,我们使用了多变量逻辑回归和倾向评分条件反射。结果:398例患者中,两组女性患者所占比例为~16.5%(41/240),平均年龄为~56.46岁。~12.2%(平均= 0.09;SD = 0.30)有蛛网膜下腔出血。92%(平均= 0.29;SD = 0.70), 85.7%(平均= 0.44;SD = 0.91)的大剂量组mRS≤2。在多因素分析中,丸剂对mRS评分无影响,P = 0.24。长期复发7例,2例(0.83%;平均值= 0.01;SD = 0.10),与预处理组比较。在多变量logistic回归中,bolus与长期复发率无关(比值比[OR] 1.91;95%置信区间[CI] 0.27-13.50;P = 0.52)或血栓栓塞事故(or 0.99;95% ci 0.96-1.03;P = 0.83)与出血事件无关(OR 1.00;95% ci 0.97-1.03;P = 0.99)。三名患者死亡:其中一名接受静脉注射的患者出现急性蛛网膜下腔出血。两组患者的平均死亡率相当~0.25 (SD = 0.16)。Bolus与死亡率无关(OR 1.11;95% ci 0.26-4.65;P = 0.89)。同样的关联也存在于倾向得分调整模型中。
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引用次数: 0
Cardiac Risk Stratification of Neurosurgical Patients 神经外科患者心脏风险分层
Pub Date : 1900-01-01 DOI: 10.29046/jhnj.015.1.002
A. Munshi
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引用次数: 0
Use of Drains After Evacuation of Chronic Subdural Hematomas 慢性硬膜下血肿引流后引流管的应用
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.005.1.003
Chengyuan Wu
A subdural hematoma (SDH) is a collection of blood that accumulates between the surface of the brain and its outermost covering, called the dura. These types of hematmas usually result from tears in bridging veins that cross this subdural space, which is typically the result of some form of trauma. A patient’s risk of developing a SDH increases with age as the brain tends to pull away from the dura, therefore stretching the bridging veins and increasing the subdural space. In addition the risk of progression of a SDH is greater if the patient is already regularly taking an anticoagulant such as Aspirin, Plavix, or Coumadin.
硬膜下血肿(SDH)是一种血液的集合,它积聚在大脑表面和它的最外层被称为硬脑膜之间。这些类型的血肿通常是由穿过硬膜下间隙的桥静脉撕裂引起的,这通常是某种形式的创伤的结果。患者患SDH的风险随着年龄的增长而增加,因为大脑倾向于脱离硬脑膜,因此会拉伸桥静脉并增加硬脑膜下空间。此外,如果患者已经定期服用阿司匹林、Plavix或香豆素等抗凝剂,则SDH进展的风险更大。
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引用次数: 1
Epilepsy Pipeline Conference Summary 癫痫管道会议纪要
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.011.2.006
D. Abrams
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引用次数: 0
Jefferson Neurologist Shows Two-Thirds Reduction in Mortality Rate after Epilepsy Surgery 杰弗逊神经科医生显示癫痫手术后死亡率降低三分之二
Pub Date : 1900-01-01 DOI: 10.29046/jhnj.011.2.007
Bs Nikolaos Mouchtouris
Dr. Sperling and his colleagues Suzanne Barshow, Dr. Maromi Nei and Dr. Ali A. Asadi-Pooya reviewed 1,110 patients’ records to find that the mortality risk in patients with drug-resistant epilepsy who underwent surgery is one-third of the mortality risk in the medication-only group of patients with drug-resistant epilepsy. They attribute this reduction to the higher rate of seizure-freedom as well as the lower proportion of tonicclonic seizures in those who continued seizures after surgery.
Sperling博士和他的同事Suzanne Barshow博士、Maromi Nei博士和Ali A. Asadi-Pooya博士回顾了1110例患者的记录,发现接受手术的耐药癫痫患者的死亡率风险是只接受药物治疗的耐药癫痫患者死亡率风险的三分之一。他们将这种减少归因于手术后持续癫痫发作的患者较高的癫痫无发作率以及较低的强直阵挛发作比例。
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引用次数: 0
Is the Quality of Neurosurgical Literature Improving 神经外科文献的质量在提高吗
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.007.1.001
J. Harrop, M. Maltenfort
Introduction: The advent of evidence-based medicine has resulted in higher quality journal manuscripts in numerous medical disciplines. However, the impact in the neurosurgical literature has not been reported. Objective: To quantify the impact of evidence-based medicine on the quality of articles published in the Neurosurgery literature. Methods: Articles published in the journal Neurosurgery (founded in 1977) were reviewed for 1978, 1988, 1998, and 2008. Each decade’s sample was classified as therapeutic, diagnostic and prognostic based on a published system for determining level of evidence. Results: 438 articles were reviewed. Articles not considered included any published under the heading “Case Report” (automatically Level IV evidence) and articles which otherwise did not directly look at patient outcome (i.e, cadaver or animal studies). The rate of Level I studies held steady at 4.5-6.0%. Level II evidence increased steadily from no articles in 1978 to 40.6% in 2008. The increases in Level I and II article publications was statistically significant (p < 0.001). Concurrently, Level IV articles decreased in rate (81.8% in 1978 to 42.4% in 2008), while Level III articles remained fairly constant (9.8%–13.6%). The largest category of Level II studies was prognostic, and the largest category for both Level III and IV studies was therapeutic. Among study types, the most dramatic increase was in the rate of prognostic studies (15.8% to 43.6%). Only 1% of all articles were economic analyses. Conclusion: The quality of neurosurgical literature has progressively improved over the last several decades. It is unclear how much of that is due to expanded activity in randomized, clinical trials or other Level I evidence as no significant increases were observed in Level I articles during the study period (1978–2008). Much of the literature improvement may be explained by the increase in retrospective, prognostic studies as neurosurgeons take advantage of years of accumulated data. The lack of any articles on economic and decision analyses suggests that the neurosurgical community has not yet studied the effect of costs in detail. Introduction Evidence-based medicine (EBM) has been established to define the quality of literature in medical specialties. It has resulted in an increase in quality of medical literature overall. However, over the last several decades there has been an emphasis by editors and professional societies on the importance of obtaining the highest quality of medical literature through reporting evidence-based medicine levels. This manuscript reviews the last three decades of a major neurosurgical journal in an attempt to identify if there have been significant changes in terms of quality as defined by contemporary evidence-based medicine schema. Specifically, evaluating if there has been an overall improvement in the quality of neurosurgery literature as defined by EBM grading schemes. Methods A retrospective review of articles publis
引言:循证医学的出现导致了许多医学学科更高质量的期刊手稿。然而,在神经外科文献中尚未报道其影响。目的:量化循证医学对神经外科文献发表文章质量的影响。方法:对1978年、1988年、1998年和2008年发表在《神经外科学》杂志(创刊于1977年)上的文章进行回顾性分析。每十年的样本被分类为治疗性、诊断性和预后性,基于一个已公布的系统来确定证据水平。结果:共纳入文献438篇。未被纳入考虑的文章包括任何在“病例报告”标题下发表的文章(自动列为IV级证据)和没有直接研究患者结果的文章(即尸体或动物研究)。一级研究的比率稳定在4.5-6.0%。二级证据从1978年的没有文章稳步上升到2008年的40.6%。一级和二级文章发表量的增加具有统计学意义(p < 0.001)。与此同时,第四级文章的比例有所下降(1978年为81.8%,2008年为42.4%),而第三级文章的比例基本保持不变(9.8%-13.6%)。II级研究中最大的类别是预后,III级和IV级研究中最大的类别是治疗性研究。在研究类型中,最显著的增加是预后研究的比例(15.8%至43.6%)。所有文章中只有1%是经济分析。结论:在过去的几十年里,神经外科文献的质量逐步提高。目前尚不清楚这在多大程度上是由于随机临床试验或其他一级证据中活动的扩大,因为在研究期间(1978-2008年),一级文章中没有观察到显著的增加。随着神经外科医生利用多年积累的数据,回顾性和预后研究的增加可以解释大部分文献的改进。缺乏任何关于经济和决策分析的文章表明,神经外科社区尚未详细研究成本的影响。循证医学(EBM)的建立是为了定义医学专业文献的质量。这导致了医学文献总体质量的提高。然而,在过去的几十年里,编辑和专业协会一直强调通过报告循证医学水平获得最高质量医学文献的重要性。本文回顾了最近三十年的主要神经外科杂志,试图确定当代循证医学模式所定义的质量是否有重大变化。具体来说,根据EBM评分方案来评估神经外科文献的质量是否有了全面的提高。方法回顾性分析发表在《神经外科学》杂志上的文章。每篇文章都是通过对摘要和手稿的详细评估来评估的。所有手稿都根据Wright等人(2003)所描述的循证医学分类进行分类或分级1。本综述仿照《骨与关节外科杂志》对文献质量的类似评价。2神经外科文献的质量在提高吗?
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引用次数: 1
Aneurysmal Rupture Without Subarachnoid Hemorrhage: A Case Report Abstract 动脉瘤破裂无蛛网膜下腔出血1例报告摘要
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.008.1.006
C. Harris, Amrith Jamoona, C. Randazzo
Introduction: The present case study reports an intraparenchymal hemorrhage from a ruptured basilar tip aneurysm without subarachnoid hemorrhage. Case Report: A 57-year-old male presented with intraparenchymal hemorrhage from a ruptured basilar tip aneurysm without subarachnoid hemorrhage. The patient had successful endovascular embolization of his ruptured cerebral aneurysm 9 years previously. Discussion: Ruptured cerebral aneurysms without subarachnoid hemorrhage are extremely rare. Cerebral angiogram for atypical presentation of patients with intracranial hemorrhages should be considered. In patients with known cerebral aneurysms who present with an intracranial hemorrhage, rupture of that aneurysm or a de novo aneurysm must be ruled out.
简介:本病例报告一例无蛛网膜下腔出血的基底动脉瘤破裂所致的肺实质内出血。病例报告:一名57岁男性,因基底端动脉瘤破裂而无蛛网膜下腔出血。该患者于9年前对其破裂的脑动脉瘤进行了成功的血管内栓塞治疗。讨论:无蛛网膜下腔出血的脑动脉瘤破裂极为罕见。不典型表现的颅内出血患者应考虑脑血管造影。已知脑动脉瘤患者出现颅内出血时,必须排除动脉瘤破裂或新生动脉瘤的可能性。
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引用次数: 0
Adjuvant Treatment in the Management of Low- Grade Gliomas 低级别胶质瘤的辅助治疗
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.004.3.004
S. Tjoumakaris
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引用次数: 0
The ARUBA Trial: How Should We Manage Brain AVMs? ARUBA试验:我们应该如何管理脑动静脉畸形?
Pub Date : 1900-01-01 DOI: 10.29046/JHNJ.009.2.002
N. Mouchtouris, N. Chalouhi, Thana Theofanis, M. Zanaty, S. Tjoumakaris, R. Rosenwasser, P. Jabbour
{"title":"The ARUBA Trial: How Should We Manage Brain AVMs?","authors":"N. Mouchtouris, N. Chalouhi, Thana Theofanis, M. Zanaty, S. Tjoumakaris, R. Rosenwasser, P. Jabbour","doi":"10.29046/JHNJ.009.2.002","DOIUrl":"https://doi.org/10.29046/JHNJ.009.2.002","url":null,"abstract":"","PeriodicalId":355574,"journal":{"name":"JHN Journal","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130219686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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