<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Annals of Clinical and Experimental Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Annals of Clinical and Experimental Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Анналы клинической и экспериментальной неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-5473</issn><issn publication-format="electronic">2409-2533</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">308</article-id><article-id pub-id-type="doi">10.17816/psaic308</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Quantitative characteristics of EEG in Alzheimer’s disease during cognitive tasks</article-title><trans-title-group xml:lang="ru"><trans-title>Количественные характеристики ЭЭГ при болезни Альцгеймера на фоне когнитивной нагрузки</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sergeev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Сергеев</surname><given-names>A. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergeev.amd@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Medvedeva</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Медведева</surname><given-names>A. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergeev.amd@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Voznesenskaya</surname><given-names>T. G.</given-names></name><name xml:lang="ru"><surname>Вознесенская</surname><given-names>T. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sergeev.amd@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">First Moscow State Medical University named after I.M. Sechenov</institution></aff><aff><institution xml:lang="ru">Первый Московский государственный медицинский университет им. И.М. Сеченова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2011-06-13" publication-format="electronic"><day>13</day><month>06</month><year>2011</year></pub-date><volume>5</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>24</fpage><lpage>28</lpage><history><date date-type="received" iso-8601-date="2017-02-03"><day>03</day><month>02</month><year>2017</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2011, Sergeev A.V., Medvedeva A.V., Voznesenskaya T.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2011, Sergeev A.V., Medvedeva A.V., Voznesenskaya T.G.</copyright-statement><copyright-year>2011</copyright-year><copyright-holder xml:lang="en">Sergeev A.V., Medvedeva A.V., Voznesenskaya T.G.</copyright-holder><copyright-holder xml:lang="ru">Sergeev A.V., Medvedeva A.V., Voznesenskaya T.G.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://annaly-nevrologii.com/pathID/article/view/308">https://annaly-nevrologii.com/pathID/article/view/308</self-uri><abstract xml:lang="en"><p> </p><p>In Alzheimer’s disease (AD) the EEG changes are rather diffuse and most expressed in moderate and severe cognitive disorders. Pathological changes of spectral power and EEG coherence are assumed to be related with the degree of cognitive deficit. The aim of this study: comparative analysis of spectral power and EEG coherence and their reactivity during functional tasks in AD patients with mild and moderate dementia and in agematched healthy control subjects. Twenty two AD patients with mild-to-moderate dementia and 25 controls were examined. All patients underwent EEG recordings with analysis of spectral power of the main rhythms, as well as with analysis of intra- and inter-hemispheric coherence and their dynamics during functional tasks. We found an increase in slow-wave activity (delta and theta rhythms) and a decrease in alpha activity in frontal, parietal and temporal regions of the brain. Intra- and interhemispheric coherence was significantly lower in frontal, parietal and temporal regions in AD patients compared to controls. EEG pattern was more obvious after functional tests. One may conclude that changes of spectral power and EEG coherence seem to be a sensitive indicator of cognitive decline at very early stages of neurodegenerative process.</p>  <p> </p> <p> </p></abstract><trans-abstract xml:lang="ru"><p>При болезни Альцгеймера (БА) изменения ЭЭГ-характеристик имеют диффузный характер и наиболее выражены при умеренных и тяжелых когнитивных расстройствах. Предполагается связь патологических изменений спектральной мощности и когерентности ЭЭГ со степенью когнитивного дефицита. Целью работы была сравнительная оценка спектральной мощности и когерентности ЭЭГ и их динамики на фоне функциональных нагрузок у пациентов с БА на стадии легкой и умеренной деменции и когнитивно здоровых пожилых испытуемых. Обследовано 22 пациента с БА на стадии легкой и умеренной деменции и 25 здоровых испытуемых. Всем испытуемым проведено ЭЭГ-исследование с анализом спектральной мощности основных ритмов, а также внутри- и межполушарной когерентности и их динамики на фоне функциональных нагрузок. Выявлено повышение медленноволновой активности (d- и q- диапазонов) и снижение a-диапазона в лобных, центральных и височных областях головного мозга. Внутри- и межполушарная когерентность была достоверно ниже в лобных, центральных и височных областях в группе пациентов с БА, чем в группе контроля. ЭЭГ- паттерн был более выражен после предъявления функциональных нагрузок. Таким образом, изменение когерентности и спектральной мощности ЭЭГ является чувствительным индикатором когнитивного снижения на самых ранних стадиях нейродегенеративного процесса.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Alzheimer’s disease</kwd><kwd>EEG</kwd><kwd>markers of cognitive decline</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Болезнь Альцгеймера</kwd><kwd>ЭЭГ</kwd><kwd>маркеры когнитивного снижения</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Гнездицкий В.В. Обратная задача ЭЭГ и клиническая электро- энцефалография. Таганрог: Изд. ТРТУ, 2004.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Елкин М.Н. Количественные характеристики ЭЭГ при пар- кинсонизме: связь с клиническими, когнитивными, возрастными особенностями. Дис. … канд. мед. наук. М., 1996.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>МКБ-10. Международная статистическая классификация болезней и проблем, связанных со здоровьем. Х пересмотр. Женева, 1995.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>American Psychiatric Association. Diagnostic and statistical manual of mental disorders, DSM IV, 4th ed. Washington, DC: APA, 1994.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Di Carlo A., Baldereschi M., Amaducci L. et al. Incidence of dementia, Alzheimer’s disease, and vascular dementia in Italy. The ILSA Study. J. Am. Geriatr. Soc. 2002; 50: 41–48.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Dierks T., Jelic V., Pascual-Marqui R.D. et al. Spatial pattern of cerebral glucose metabolism (PET) correlates with localization of intracerebral EEG generators in Alzheimer’s disease. Clin. Neurophysiol. 2000; 11: 1817–1824.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Dierks T., Perisic I., Frolich L. et al. Topography of the quantitative electroencephalogram in dementia of the Alzheimer type: relation to severity of dementia. Psychiatry Res. 2001; 40: 181–194.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Huang C., Wahlund L.O., Dierks T. et al. Discrimination of Alzheimer’sdisease and mild cognitive impairment by equivalent EEG sources: a cross-sectional and longitudinal study. Clin. Neurophysiol. 2000; 111: 1961–1967.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Mantini M.G, Perrucci C., Del Gratta D. et al. Electrophysiological signatures of resting state networks in the human brain. PNAS 2007; 16: 104–110.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Maurer K. Topography of the quantitative electroencephalogram in dementia of the Alzheimer type. Psychiatry Res. 2005; 40: 181–194. Том 5. № 2 2011 28</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>Medvedeva A., Keeser D., Meindl T. et al. Functional connectivity in patients with early Alzheimer’s disease, MCI and healthy controls as assessed by fMRI and EEG. Res. f. Neues aus der psychiatrischen Forschung. Munchen, 2008.</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Prichep L.S., John E.R., Ferris S.H. et al. Quantitative EEG correlates of cognitive deterioration in the elderly. Neurobiol. Aging 2004; 15: 85–90.</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Saletu B., Anderer P., Paulus E. et al. EEG brain mapping in diagnostic and therapeutic assessment of dementia. Alzheimer Dis. Assoc. Disord. 1991; 5 (suppl.1): 57–75.</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>Saletu B., Anderer P., Semlitsch H.V. Relations between symptomatology and brain function indementias: Double-blind, placebo-controlled, clinical and EEG/ERP mapping studies with nicergoline. Dement Geriatr. Cogn. Disord. 1997; 8 (Suppl. 1): 12–21.</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Saletu B., Anderer P., Saletu-Zyhlarz G.M., Pascual-Marqui R.D. EEG topography and tomography in diagnosis and treatment of mental disorders: evidence for a key-lock principle. Methods Find. Exp. Clin. Pharmacol. 2002; 7: 73.</mixed-citation></ref><ref id="B16"><label>16.</label><mixed-citation>Shigeta M., Julin P., Almkvist O. et al. Quantitative electroencephalography power and coherence in Alzheimer’s disease and mild cognitive impairment. Dementia 2006; 7: 314–323.</mixed-citation></ref><ref id="B17"><label>17.</label><mixed-citation>Schreiter-Gasser U., Gasser T., Ziegler P. Quantitative EEG analysis in early onset Alzheimer’s disease: correlations with severity, clinical characteristics, visual EEG and CCT. PNAS. 2004; 13: 46–54. 18. Vincent G., Formisano E., Prvulovic D. et al. Linden: Functional connectivity as revealed by spatial independent component analysis of fMRI measurements during rest. Hum. Brain Mapping 2004; 22: 165–178.</mixed-citation></ref></ref-list></back></article>
