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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Medicine</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Medicine</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Медицина</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-0245</issn><issn publication-format="electronic">2313-0261</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">45190</article-id><article-id pub-id-type="doi">10.22363/2313-0245-2025-29-2-153-161</article-id><article-id pub-id-type="edn">TDOZPC</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CARDIOLOGY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КАРДИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Clinical, laboratory and echocardiographic left atrial appendage thrombus predictors in patients with atrial fibrillation</article-title><trans-title-group xml:lang="ru"><trans-title>Клинико-лабораторные и эхокардиографические предикторы тромбоза ушка левого предсердия у пациентов с фибрилляцией предсердий</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5211-709X</contrib-id><contrib-id contrib-id-type="spin">8435-3422</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalatsei</surname><given-names>Liudmila V.</given-names></name><name xml:lang="ru"><surname>Колоцей</surname><given-names>Л. В.</given-names></name></name-alternatives><email>lkolotsey@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ibrahim</surname><given-names>Aroosha</given-names></name><name xml:lang="ru"><surname>Ибрахим</surname><given-names>А.</given-names></name></name-alternatives><email>lkolotsey@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fernando</surname><given-names>Chelsy E.S.</given-names></name><name xml:lang="ru"><surname>Фернандо</surname><given-names>Ч. Э. С.</given-names></name></name-alternatives><email>lkolotsey@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Grodno State Medical University</institution></aff><aff><institution xml:lang="ru">Гродненский государственный медицинский университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-28" publication-format="electronic"><day>28</day><month>06</month><year>2025</year></pub-date><volume>29</volume><issue>2</issue><issue-title xml:lang="en">CARDIOLOGY</issue-title><issue-title xml:lang="ru">КАРДИОЛОГИЯ</issue-title><fpage>153</fpage><lpage>161</lpage><history><date date-type="received" iso-8601-date="2025-07-22"><day>22</day><month>07</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Kalatsei L.V., Ibrahim A., Fernando C.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Колоцей Л.В., Ибрахим А., Фернандо Ч.Э.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Kalatsei L.V., Ibrahim A., Fernando C.E.</copyright-holder><copyright-holder xml:lang="ru">Колоцей Л.В., Ибрахим А., Фернандо Ч.Э.</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-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/medicine/article/view/45190">https://journals.rudn.ru/medicine/article/view/45190</self-uri><abstract xml:lang="en"><p><italic>Relevance.</italic> The most common and persistent arrhythmia today is atrial fibrillation (AF). Decrease in blood flow velocity in the left atrium appendage (LAA), endothelial dysfunction and hemostatic system changes can cause the development of left atrium appendage thrombosis (LAAT), which is the main source of thromboembolism in patients with AF. Numerous studies have explored various clinical, echocardiographic, and laboratory parameters as potential predictors, however, the predictive power of these parameters is still insufficient for real clinical practice. <italic>Aim of the study </italic>was to evaluate predictive ability of clinical, laboratory and echocardiographic markers in diagnosis of LAAT in patients with non-valvular AF.<bold> </bold><italic>Materials and methods.</italic> The study included 100 patients with persistent non-valvular AF who were admitted for direct electrical cardioversion. All patients underwent clinical, laboratory, and instrumental studies, including transthoracic and transesophageal echocardiography (TEE). According to TEE results, patients were divided into 2 groups: patients with LAA thrombus «LAAT» (n = 30) and without LAA thrombus «Non LAAT» (n = 70). Statistical analysis was performed using the STATISTICA 10.0 software. <italic>Results and Discission.</italic> Patients in both groups were comparable in age, gender, prevalence of hypertension, coronary artery disease, obesity, prior stroke, and diabetes mellitus (<italic>p </italic>&gt; 0.05). Patients with LAAT had a significantly longer duration period of persistent AF (7 [4; 9] months vs 4 [3; 6] months, <italic>p</italic>  =  0.004) in comparison with patients without LAAT. Laboratory markers of patients in both groups had no significant differences except for eGFR (<italic>p </italic> =  0.047) and NT-proBNP level (<italic>p</italic>  =  0.011). According to the results of echocardiography, patients didn’t have differences in left atrial (LA) diameter and volume (<italic>p </italic>&gt; 0.05). However, LA volume index was higher in patients with LAAT (<italic>p</italic>  =  0.007). When conducting a one-way ROC analysis, the NT-proBNP level of ≥ 1689 pg/ml showed the largest area under the ROC-curve (0.747) as well as the highest specificity (92.6%). Duration of persistent AF ≥ 4.5 months showed the highest sensitivity (90%). <italic>Conclusion.</italic> Patients with LAAT had longer duration of persistent AF, higher values of LA volume index, as well as higher NT-proBNP levels. Further use of these parameters could help predict LAAT development in patients with AF.</p></abstract><trans-abstract xml:lang="ru"><p><italic>Актуальность</italic>. Наиболее распространенной аритмией на сегодняшний день является фибрилляция предсердий (ФП). Снижение скорости кровотока в ушке левого предсердия (ЛП), эндотелиальная дисфункция и изменения в системе гемостаза могут стать причиной развития тромбоза ушка ЛП, который является основным источником тромбоэмболии у пациентов с ФП. В многочисленных исследованиях различные клинические, эхокардиографические и лабораторные параметры рассматривались как потенциальные предикторы, однако прогностическая сила этих параметров все еще недостаточна для реальной клинической практики. Цель исследования — оценить прогностическую способность клинических, лабораторных и эхокардиографических маркеров в диагностике тромбоза ушка ЛП у пациентов с неклапанной ФП. <italic>Материалы и методы</italic>. В исследование включены 100 пациентов с персистирующей неклапанной ФП, госпитализированных для проведения электрической кардиоверсии. Всем пациентам проводились клинико-­лабораторные и инструментальные исследования, включая трансторакальную и чреспищеводную эхокардиографию (ЧП-ЭхоКГ). По результатам ЧП-ЭхоКГ пациенты были разделены на 2 группы: пациенты с тромбом ушка ЛП (n  =  30) и без тромба ушка ЛП (n  =  70). Статистический анализ проводили с использованием программы STATISTICA 10.0. Результаты и обсуждение. Пациенты обеих групп были сопоставимы по возрасту, полу, распространенности артериальной гипертензии, ишемической болезни сердца, ожирения, перенесенного инсульта и сахарного диабета (<italic>р </italic>&gt; 0,05). У пациентов с тромбозом ушка ЛП выявлена большая длительность эпизода персистирующей ФП (7 [4; 9] мес против 4 [3; 6] мес, <italic>р </italic> =  0,004) по сравнению с пациентами без тромбоза ушка ЛП. Лабораторные маркеры пациентов обеих групп не имели достоверных различий, за исключением СКФ (<italic>р </italic> =  0,047) и уровня NT-proBNP (<italic>р </italic> =  0,011). По результатам эхокардиографии у пациентов не было различий в диаметре и объеме ЛП (<italic>р </italic>&gt; 0,05), однако индекс объема ЛП был выше у пациентов с тромбом ушка ЛП (<italic>р </italic> =  0,007). При проведении ROC-анализа уровень NT-proBNP ≥ 1689 пг/мл показал наибольшую площадь под ROC-кривой (0,747), а также самую высокую специфичность (92,6%). Длительность персистирующей ФП ≥ 4,5 мес показала наибольшую чувствительность (90%). <italic>Выводы</italic>. Пациенты с тромбом ушка ЛП имели большую длительность персистирующей ФП, более высокие значения индекса объема ЛП, а также более высокие уровни NT-proBNP. Дальнейшее использование этих параметров может помочь прогнозировать развитие тромбоза ушка ЛП у пациентов с ФП.</p></trans-abstract><kwd-group xml:lang="en"><kwd>atrial fibrillation</kwd><kwd>left atrial appendage thrombus</kwd><kwd>echocardiography</kwd><kwd>left atrial volume index</kwd><kwd>NT-proBNP</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фибрилляция предсердий</kwd><kwd>тромб ушка левого предсердия</kwd><kwd>эхокардиография</kwd><kwd>индекс объема левого предсердия</kwd><kwd>NT-proBNP</kwd></kwd-group><funding-group/></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Haim M, Hoshen M, Reges O. Prospective national study of the prevalence, incidence, management and outcome of a large contemporary cohort of patients with incident non-valvular atrial fibrillation. 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