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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">russjcardiol</journal-id><journal-title-group><journal-title xml:lang="ru">Российский кардиологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Cardiology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1560-4071</issn><issn pub-type="epub">2618-7620</issn><publisher><publisher-name>«SILICEA-POLIGRAF» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.15829/1560-4071-2024-6036</article-id><article-id custom-type="edn" pub-id-type="custom">RMHMCY</article-id><article-id custom-type="elpub" pub-id-type="custom">russjcardiol-6036</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКОЕ НАБЛЮДЕНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>КЛИНИЧЕСКОЕ НАБЛЮДЕНИЕ</subject></subj-group></article-categories><title-group><article-title>Сочетанная альтернация комплекса QRS и зубца Т – новый электрокардиографический феномен при синдроме удлиненного интервала QT: клиническое наблюдение</article-title><trans-title-group xml:lang="en"><trans-title>Combined QRS complex and T wave alternans — a new electrocardiographic phenomenon in long QT syndrome: a clinical observation</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0111-3643</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макаров</surname><given-names>Л. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarov</surname><given-names>L. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Леонид Михайлович Макаров— д. м. н., профессор, руководитель Центра синкопальных состояний и сердечных аритмий</p><p>Москва</p><p> </p></bio><email xlink:type="simple">dr.leonidmakarov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4867-0594</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Акопян</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Akopyan</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ануш Григорьевна Акопян — врач Центра синкопальных состояний и сердечных аритмий</p><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">anushik.a.g@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3691-7449</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Комолятова</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Komolyatova</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вера Николаевна Комолятова — д.м.н., врач Центра синкопальных состояний и сердечных аритмий</p><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">verakom@list.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3699-2289</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Беспорточный</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Besportochny</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дмитрий Алексеевич Беспорточный — врач Центра синкопальных состояний и сердечных аритмий</p><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">dr.blad@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ Федеральный научно-клинический центр детей и подростков ФМБА России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Federal Scientific and Clinical Center for Children and Adolescents</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2024</year></pub-date><volume>29</volume><issue>10S</issue><issue-title>Клинические случаи</issue-title><fpage>6036</fpage><lpage>6036</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Макаров Л.М., Акопян А.Г., Комолятова В.Н., Беспорточный Д.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Макаров Л.М., Акопян А.Г., Комолятова В.Н., Беспорточный Д.А.</copyright-holder><copyright-holder xml:lang="en">Makarov L.M., Akopyan A.G., Komolyatova V.N., Besportochny D.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://russjcardiol.elpub.ru/jour/article/view/6036">https://russjcardiol.elpub.ru/jour/article/view/6036</self-uri><abstract><p>Представлен ранее не описанный электрокардиографический паттерн у больной с синдром удлиненного интервала QT в виде сочетанной альтернации комплекса QRS и зубца Т. Обсуждаются его возможные электрофизиологические механизмы и прогностическое значение.</p></abstract><trans-abstract xml:lang="en"><p>A previously undescribed electrocardiographic pattern is presented in a female patient with long QT syndrome in the form of combined QRS complex and T wave alternans. Possible electrophysiological mechanisms and prognostic value are discussed</p></trans-abstract><kwd-group xml:lang="ru"><kwd>синдром удлиненного интервала QT</kwd><kwd>сочетанная альтернация комплекса QRS и зубца Т</kwd><kwd>новый электрокардиографический паттерн</kwd></kwd-group><kwd-group xml:lang="en"><kwd>long QT syndrome</kwd><kwd>combined QRS complex and T wave alternans</kwd><kwd>new electrocardiographic pattern</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">нет</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Moss A. 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