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<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">Russian Journal of Child Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Child Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Русский журнал детской неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2073-8803</issn><issn publication-format="electronic">2412-9178</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">361</article-id><article-id pub-id-type="doi">10.17650/2073-8803-2021-16-1-2-42-57</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL REPORTS</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">EEG findings in patients with angelman syndrome. Notched slow waves and age-specific characteristics of the main EEG patterns</article-title><trans-title-group xml:lang="ru"><trans-title>ЭЭг при синдроме ангельмана. Зубчатые медленные волны и возрастные характеристики основных ЭЭг-паттернов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuzmich</surname><given-names>G. V.</given-names></name><name xml:lang="ru"><surname>Кузьмич</surname><given-names>Г. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><bold>Grigoriy Viktorovich Kuzmich</bold> </p><p>5 Nagornaya St., Troitsk, Moscow 108840</p><p>21A 5th Donskoy Proezd, Moscow 119334</p></bio><bio xml:lang="ru"><p><bold>Григорий Викторович Кузьмич </bold> </p><p>108840 Москва, Троицк, ул. Нагорная, 5</p><p>119334 Москва, 5-й Донской проезд, 21А</p></bio><email>kuzmichgv@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6125-0618</contrib-id><name-alternatives><name xml:lang="en"><surname>Bobylova</surname><given-names>M. Yu.</given-names></name><name xml:lang="ru"><surname>Бобылова</surname><given-names>М. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><bold>Mariya Yuryevna Bobylova</bold> </p><p>5 Nagornaya St., Troitsk, Moscow 108840</p><p>9 Akademika Anokhina St., Moscow 119579</p></bio><bio xml:lang="ru"><p><bold>Мария Юрьевна Бобылова</bold> </p><p>108840 Москва, Троицк, ул. Нагорная, 5</p><p>119579 Москва, ул. Академика Анохина, 9</p></bio><email>mariya_bobylova@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8855-7740</contrib-id><name-alternatives><name xml:lang="en"><surname>Mukhin</surname><given-names>K. Yu.</given-names></name><name xml:lang="ru"><surname>Мухин</surname><given-names>К. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>5 Nagornaya St., Troitsk, Moscow 108840</p><p>9 Akademika Anokhina St., Moscow 119579</p></bio><bio xml:lang="ru"><p>108840 Москва, Троицк, ул. Нагорная, 5</p><p>119579 Москва, ул. Академика Анохина, 9</p></bio><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9050-2036</contrib-id><name-alternatives><name xml:lang="en"><surname>Pylaeva</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Пылаева</surname><given-names>О. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>5 Nagornaya St., Troitsk, Moscow 108840</p><p>9 Akademika Anokhina St., Moscow 119579</p></bio><bio xml:lang="ru"><p>108840 Москва, Троицк, ул. Нагорная, 5</p><p>119579 Москва, ул. Академика Анохина, 9</p></bio><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Glukhova</surname><given-names>L. Yu.</given-names></name><name xml:lang="ru"><surname>Глухова</surname><given-names>Л. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>5 Nagornaya St., Troitsk, Moscow 108840</p></bio><bio xml:lang="ru"><p>108840 Москва, Троицк, ул. Нагорная, 5</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bagdasaryan</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Багдасарян</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Build. 1, 20 Delegatskaya St., Moscow 127473</p></bio><bio xml:lang="ru"><p>127473 Москва, ул. Делегатская, 20, стр. 1</p></bio><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zakharova</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Захарова</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Samory Mashela St., GSP-7, Moscow 117997</p></bio><bio xml:lang="ru"><p>117997 Москва, ГСП-7, ул. Саморы Машела, 1</p></bio><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Svt. Luka’s Institute of Child Neurology and Epilepsy</institution></aff><aff><institution xml:lang="ru">ООО «Институт детской неврологии и эпилепсии им. Свт. Луки»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">G.E. Sukhareva Research and Practical Center for Mental Health of Children and Adolescents, Moscow Healthcare Department</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Научно-практический центр психического здоровья детей и подростков им. Г.Е. Сухаревой» ДЗМ</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Svt. Luka’s Institute of Child and Adult Neurology and Epilepsy</institution></aff><aff><institution xml:lang="ru">ООО «Институт детской и взрослой неврологии и эпилепсии им. Свт. Луки»</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">A.I. Evdokimov Moscow State University of Medicine and Dentistry, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Московский государственный медико-стоматологический университет им. А.И. Евдокимова»</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">D. Rogachev National Research Center of Pediatric Hematology, Oncology, and Immunology</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный научно-практический центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2021</year></pub-date><volume>16</volume><issue>1-2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>42</fpage><lpage>57</lpage><history><date date-type="received" iso-8601-date="2021-07-30"><day>30</day><month>07</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-07-30"><day>30</day><month>07</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, ABV-Press</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, АБВ-пресс</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">ABV-Press</copyright-holder><copyright-holder xml:lang="ru">АБВ-пресс</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://rjdn.abvpress.ru/jour/about/editorialPolicies</ali:license_ref></license></permissions><self-uri xlink:href="https://rjdn.abvpress.ru/jour/article/view/361">https://rjdn.abvpress.ru/jour/article/view/361</self-uri><abstract xml:lang="en"><p>Angelman syndrome (AS) is a genetic disorder caused by a mutation in the maternal copy of the <italic>UBE3A </italic>gene and characterized by typical clinical manifestations (such as mental retardation, difficulty walking, and laughter) and specific changes on the electroencephalogram (EEG).<bold>The aim of this study </bold>was to analyze age-specific characteristics of the main EEG patterns, including high-amplitude frontal delta activity with spikes, slow-wave delta-theta activity with spikes in the posterior regions, and diffuse continuous rhythmic theta activity. In addition to that, we assessed the frequency of a rare and highly specific for AS EEG pattern: notched slow waves.We have identified and described additional criteria for EEG during sleep: high index of pathological slow-wave activity and the ratio of pathological slow-wave activity index to epileptiform activity index during sleep. We also analyzed all EEG patterns at the age most significant for the detection of this syndrome (up to 3 years) and their age-specific dynamics.We covered the frequency and characteristics of EEG patterns rare in AS patients, such as three-phase bifrontal delta waves, reactive pathological activity in the posterior areas, EEG patterns of focal seizures originating from the posterior areas, benign epileptiform discharges of childhood, and migrating continuous slow-wave activity.We analyzed the differences between main EEG patterns in AS and frontal and occipital intermittent rhythmic delta activity (fIRDA and OIRDA patterns).</p></abstract><trans-abstract xml:lang="ru"><p>Синдром Ангельмана – хромосомный синдром, возникающий в результате мутации материнской копии гена UBE3A, имеющий характерную клиническую картину (задержка психического развития, шаткость при ходьбе, приступы смеха) и специфические изменения на электроэнцефалограмме (ЭЭг).Целью исследования было изучение возрастных характеристик всех основных ЭЭг-паттернов, таких как высокоамплитудная лобная дельта-активность с включением спайков, медленноволновая дельта-тета-активность с включением спайков в задних отделах и диффузная продолженная ритмичная тета-активность. Дополнительно проведен анализ встречаемости редкого и высокоспецифичного для синдрома Ангельмана ЭЭг-феномена – зубчатых медленных волн. Впервые выявлены и подробно описаны дополнительные критерии ЭЭг во время сна: высокий индекс патологической медленноволновой активности и соотношение между индексами патологической медленноволновой и эпилептиформной активностью во сне.Проанализированы все ЭЭг-паттерны в возрасте, наиболее значимом для выявления синдрома (до 3 лет), и их возрастная динамика.Описаны частота встречаемости и характеристики редких при синдроме Ангельмана ЭЭг-паттернов, таких как трифазные бифронтальные дельта-волны, феномен реактивности патологической активности в задних отделах, ЭЭг-паттерны фокальных приступов, исходящих из задних отделов, доброкачественные эпилептиформные паттерны детства и феномен мигрирующей продолженной медленноволновой активности.Проанализированы различия между основными ЭЭг-паттернами при синдроме Ангельмана и преходящей ритмичной лобной и затылочной дельта-активностью (паттерны fIRDA и OIRDA).</p></trans-abstract><kwd-group xml:lang="en"><kwd>Angelman syndrome</kwd><kwd>UBE3A gene</kwd><kwd>epilepsy</kwd><kwd>electroencephalography</kwd><kwd>video EEG monitoring</kwd><kwd>notched delta activity</kwd><kwd>delta-theta-OPT pattern</kwd><kwd>benign epileptiform discharges of childhood</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>синдром Ангельмана</kwd><kwd>ген UBE3A</kwd><kwd>эпилепсия</kwd><kwd>электроэнцефалография</kwd><kwd>видео-ЭЭг-мониторинг</kwd><kwd>зубчатая дельта-активность</kwd><kwd>паттерн дельта-тета-ОРТ</kwd><kwd>доброкачественные эпилептиформные паттерны детства</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">1. 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