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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">10.15829/1560-4071-2025-6389</article-id><article-id custom-type="edn" pub-id-type="custom">HSPJQG</article-id><article-id custom-type="elpub" pub-id-type="custom">russjcardiol-6389</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>КЛИНИЧЕСКИЕ СЛУЧАИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL CASES</subject></subj-group></article-categories><title-group><article-title>Эндокардит Леффлера у молодой пациентки с поражением обоих желудочков. Клинический случай</article-title><trans-title-group xml:lang="en"><trans-title>Loeffler endocarditis in a young patient with biventricular involvement. A case report</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8152-8514</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хайрутдинова</surname><given-names>Г. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Khairutdinova</surname><given-names>G. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гульнара Маратовна Хайрутдинова — зав. отделением функциональной диагностики, кардиолог.</p><p>Набережные Челны</p></bio><bio xml:lang="en"><p>Naberezhnye Chelny</p></bio><email xlink:type="simple">hairutdinova-gulnara@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/0009-0004-2696-0330</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шакирзянова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shakirzyanova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>=</p><p>Лилия Александровна Шакирзянова — врач функциональной диагностики.</p><p>Набережные Челны</p></bio><bio xml:lang="en"><p>Naberezhnye Chelny</p></bio><email xlink:type="simple">hairutdinova-gulnara@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГАУЗ РТ Больница скорой медицинской помощи</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Emergency Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>24</day><month>10</month><year>2025</year></pub-date><volume>30</volume><issue>10S</issue><issue-title>Клинические случаи</issue-title><fpage>6389</fpage><lpage>6389</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хайрутдинова Г.М., Шакирзянова Л.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Хайрутдинова Г.М., Шакирзянова Л.А.</copyright-holder><copyright-holder xml:lang="en">Khairutdinova G.M., Shakirzyanova L.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/6389">https://russjcardiol.elpub.ru/jour/article/view/6389</self-uri><abstract><sec><title>Введение</title><p>Введение. Эндокардит Леффлера (ЭЛ) — редкая форма рестриктивной кардиомиопатии, характеризующаяся инфильтрацией эндокарда и миокарда эозинофилами с последующей дегрануляцией, образованием внутрисердечных тромбов и фиброзом. Фиброз приводит к прогрессирующей сердечной недостаточности (СН), в терминальной стадии требующей трансплантации сердца.</p></sec><sec><title>Краткое описание</title><p>Краткое описание. Представлен клинический случай 20-летней пациентки с ЭЛ, дебютировавший с болями в груди, одышкой, слабостью, субфебрилитетом и выраженной эозинофилией (эозинофилы до 50%, лейкоцитоз до 48×109/л). Диагностический поиск причин эозинофилии (эозинофильный лейкоз, гемобластозы, паразитарные инфекции, системные заболевания) результатов не дал. На фоне нарастающей СН и снижения фракции выброса левого желудочка до 35% пациентка была переведена в федеральный центр. Консервативная терапия привела к компенсации СН, и показаний к трансплантации сердца не было. В течение последующего года наблюдались повторные госпитализации в федеральные центры, сохранялись слабость, одышка при физической нагрузке, митральная недостаточность III степени и персистирующая эозинофилия. Отсутствие постоянного лечащего врача и курирующей медицинской организации затрудняло наблюдение.</p></sec><sec><title>Дискуссия</title><p>Дискуссия. Представляется целесообразным создание регистра пациентов с ЭЛ, маршрутизация пациентов в специализированные центры и организация диспансерного наблюдения мультидисциплинарной командой.</p><p>Данный случай подчеркивает важность ранней диагностики и своевременного лечения ЭЛ для улучшения прогноза, а также необходимость повышения осведомленности врачей о данной патологии.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Loeffler endocarditis (LE) is a rare restrictive cardiomyopathy characterized by endocardial and myocardial eosinophil infiltration followed by degranulation, intracardiac thrombus formation, and fibrosis. Fibrosis leads to progressive heart failure (HF), requiring heart transplantation in the end stage.</p></sec><sec><title>Brief description</title><p>Brief description. A case report of a 20-year-old female patient with LE is presented. The patient presented chest pain, dyspnea, weakness, low-grade fever, and severe eosinophilia (eosinophil count up to 50%, white blood cell count up to 48×109/l). Diagnostic search for eosinophilia causes (eosinophilic leukemia, hematological malignancies, parasitic infections, systemic diseases) did not yield any results. Against the background of progressive heart failure and a decrease in the left ventricular ejection fraction to 35%, the patient was transferred to a federal center. Conservative therapy compensated heart failure, and there were no indications for heart transplantation. Over the next year, there were rehospitalizations to federal centers. Weakness, shortness of breath, grade III mitral regurgitation and eosinophilia persisted.</p><p>The absence of a permanent attending physician and supervising medical facility made follow-up difficult.</p></sec><sec><title>Discussion</title><p>Discussion. It seems beneficial to create a registry of LE patients, route patients to specialized centers and manage outpatient follow-up by a multidisciplinary team. This case emphasizes the importance of early diagnosis and timely treatment of LE to improve the prognosis, as well as the need to increase physician awareness of this pathology.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>эндокардит Леффлера</kwd><kwd>клинический случай</kwd><kwd>гиперэозинофилия</kwd><kwd>тромбоз желудочков</kwd><kwd>разрастание эндокарда</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Loeffler endocarditis</kwd><kwd>case report</kwd><kwd>hypereosinophilia</kwd><kwd>ventricular thrombosis</kwd><kwd>endocardial overgrowth</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">отсутствует</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">Wang SA, Orazi A, Gotlib J, et al. The international consensus classification of eosinophilic disorders and systemic mastocytosis. 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