Electroencephalography and clinical neurophysiology最新文献_第7页

Generalized background qEEG abnormalities in localized symptomatic epilepsy 局限性症状性癫痫的qEEG异常

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00026-1

G.F Dı́az , T Virués , M San Martı́n , M Ruiz , L Galán , L Paz , P Valdés

{"title":"Generalized background qEEG abnormalities in localized symptomatic epilepsy","authors":"G.F Dı́az , T Virués , M San Martı́n , M Ruiz , L Galán , L Paz , P Valdés","doi":"10.1016/S0013-4694(98)00026-1","DOIUrl":"10.1016/S0013-4694(98)00026-1","url":null,"abstract":"<div><p>Spectral features of EEG background activity were studied in patients with localized symptomatic epilepsy (LSE), with origin in the frontal or temporal lobes. Z-values of high resolution spectra and measures of the parametric (<em>ξ</em><em>α</em>) model of the EEG were obtained for all 10/20 System leads and were compared with those obtained in a control group. Comparisons were performed between syndromic variants of LSE and between subgroups of patients with or without paroxysmal activity in their digital EEGs (dEEG). Marked reduction of the energy in the alpha range and a mild increase in the theta range were found in the patients, unrelated to the syndromic variant of the epilepsy. These deviations from normality were widespread on the scalp and were not related to antiepileptic medication. Non-parametric testing showed a positive correlation between the magnitude of the quantitative EEG abnormalities and the amount of paroxysmal activity in the dEEG. Slowing of the mean frequency of alpha components of the spectra, an actual decrease of power in the alpha range and an increase in the theta range explained the results. The most striking finding of this paper is that focal epileptogenesis may have a generalized impact in the frequency composition of EEG.</p></div>","PeriodicalId":72888,"journal":{"name":"Electroencephalography and clinical neurophysiology","volume":"106 6","pages":"Pages 501-507"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0013-4694(98)00026-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20654728","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: 31

Non-invasive piezoelectric transducer for recording of at the level of diaphragm 用于记录膜片水平的非侵入式压电换能器

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00019-4

Jouko Siivola , A Heikki Lang

引用次数: 15

Abstract 摘要。

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00034-0

引用次数: 0

Digital archival and exchange of events in a simple format for polygraphic recordings with application in event related potential studies 数字档案和交换事件在一个简单的格式为多测记录与应用事件相关的潜在研究

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00029-7

Maarten van de Velde , Margaretha M.C van den Berg-Lenssen , Geert J.M van Boxtel , Pierre J.M Cluitmans , Bob Kemp , John Gade , Carsten E Thomsen , Alpo Värri

{"title":"Digital archival and exchange of events in a simple format for polygraphic recordings with application in event related potential studies","authors":"Maarten van de Velde , Margaretha M.C van den Berg-Lenssen , Geert J.M van Boxtel , Pierre J.M Cluitmans , Bob Kemp , John Gade , Carsten E Thomsen , Alpo Värri","doi":"10.1016/S0013-4694(98)00029-7","DOIUrl":"10.1016/S0013-4694(98)00029-7","url":null,"abstract":"<div><p>This paper describes a simple method of event encoding as an extension to a previously defined standard format, the European Data Format (EDF). The specification ensures full backward compatibility with the existing definition. By using this extension, the format can be used to store both continuous recordings and selected epochs of recordings. The encoding is performed in a channel of event-codes or in a pseudo-channel for annotations. Standardisation of event encoding is discussed. Decoding of events or annotations from the extended format is implemented at the application level. Existing programs that do not support the new encoding scheme still operate correctly and can simply ignore the new channels in processing `extended' data files. The event encoding is also compatible with EDF's capability to encode channels of different sampling frequency.</p></div>","PeriodicalId":72888,"journal":{"name":"Electroencephalography and clinical neurophysiology","volume":"106 6","pages":"Pages 547-551"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0013-4694(98)00029-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20655958","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: 5

Abstract 摘要

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00042-X

引用次数: 0

An expert system for EEG monitoring in the pediatric intensive care unit 儿童重症监护病房脑电图监测专家系统

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(97)00154-5

Y. Si , J. Gotman , A. Pasupathy , D. Flanagan , B. Rosenblatt , R. Gottesman

{"title":"An expert system for EEG monitoring in the pediatric intensive care unit","authors":"Y. Si , J. Gotman , A. Pasupathy , D. Flanagan , B. Rosenblatt , R. Gottesman","doi":"10.1016/S0013-4694(97)00154-5","DOIUrl":"10.1016/S0013-4694(97)00154-5","url":null,"abstract":"<div><p><strong>Objectives</strong>: To design a warning system for the pediatric intensive care unit (PICU). The system should be able to make statements at regular intervals about the level of abnormality of the EEG. The warnings are aimed at alerting an expert that the EEG may be abnormal and needs to be examined. <strong>Methods</strong>: A total of 188 EEG sections lasting 6 h each were obtained from 74 patients in the PICU. Features were extracted from these EEGs, and with the use of fuzzy logic and neural networks, we designed an expert system capable of imitating a trained EEGer in providing an overall judgment of abnormality about the EEG. The 188 sections were used in training and testing the system using the rotation method, thus separating training and testing data. <strong>Results</strong>: The EEGer and the expert system classified the EEGs in 7 levels of abnormality. There was concordance between the two in 45% of cases. The expert system was within one abnormality level of the EEGer in 91% of cases and within two levels in 97%. <strong>Conclusions</strong>: We were able to design a system capable of providing reliably an assessment of the level of abnormality of a 6 h section of EEG. This system was validated with a large data set, and could prove useful as a warning device during long-term ICU monitoring to alert a neurophysiologist that an EEG requires attention.</p></div>","PeriodicalId":72888,"journal":{"name":"Electroencephalography and clinical neurophysiology","volume":"106 6","pages":"Pages 488-500"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0013-4694(97)00154-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20654727","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: 42

Volume conduction effects in EEG and MEG 脑电和脑磁图的体积传导效应

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(97)00147-8

S.P van den Broek, F Reinders, M Donderwinkel, M.J Peters

引用次数: 292

Kugelberg lecture: principles and pitfalls of nerve conduction studies Kugelberg讲座:神经传导研究的原理和陷阱

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00025-X

Jun Kimura

引用次数: 18

A rapid method for determining standard 10/10 electrode positions for high resolution EEG studies 一种快速确定高分辨率脑电图研究标准10/10电极位置的方法

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00004-2

Jian Le, Min Lu, Emiliana Pellouchoud, Alan Gevins

{"title":"A rapid method for determining standard 10/10 electrode positions for high resolution EEG studies","authors":"Jian Le, Min Lu, Emiliana Pellouchoud, Alan Gevins","doi":"10.1016/S0013-4694(98)00004-2","DOIUrl":"10.1016/S0013-4694(98)00004-2","url":null,"abstract":"<div><p>This report describes the basic principle and examines the comparative accuracy of a novel method for locating 3-D coordinates of electrode positions on the head. The method involves calculation of the 3-D coordinates for any array of 10/10 electrode positions from 14 straight-line distances between 11 10/10 electrodes. In 11 subjects the 3-D coordinates of 64 scalp electrodes embedded in an electrode cap were identified with the novel method, and also with a standard commercial magnetic field digitizer. The outcomes from the two methods were compared with directly measured coordinates of all 64 positions (cf. De Munck, J.C., Vijn, P.C.M. and Spekreijse, H. A practical method for determining electrode positions on the head. Electroenceph. clin. Neurophysiol., 1991, 89: 85–87). Coordinates in 3 dimensions obtained using the new method were significantly closer to the directly measured values than those from the magnetic field digitizer. The new method was also quicker and requires less specialized instrumentation than the magnetic field digitization method. The novel method appears to be a valid and convenient tool for use with EEG analysis techniques that require specific information about 10/10 electrode positions.</p></div>","PeriodicalId":72888,"journal":{"name":"Electroencephalography and clinical neurophysiology","volume":"106 6","pages":"Pages 554-558"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0013-4694(98)00004-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20655960","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: 60

Abstract 摘要

Electroencephalography and clinical neurophysiology Pub Date : 1998-06-01 DOI: 10.1016/S0013-4694(98)00023-6

引用次数: 0