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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">rpcardio</journal-id><journal-title-group><journal-title xml:lang="en">Rational Pharmacotherapy in Cardiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Рациональная Фармакотерапия в Кардиологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1819-6446</issn><issn pub-type="epub">2225-3653</issn><publisher><publisher-name>«SILICEA-POLIGRAF» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20996/1819-6446-2026-3298</article-id><article-id custom-type="edn" pub-id-type="custom">GLMMQB</article-id><article-id custom-type="elpub" pub-id-type="custom">rpcardio-3298</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="en"><subject>ORIGINAL STUDIES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group></article-categories><title-group><article-title>Association of hyponatremia with in-hospital mortality in cardiac ward patients: a retrospective analysis</article-title><trans-title-group xml:lang="ru"><trans-title>Взаимосвязь гипонатриемии и госпитальной летальности у пациентов кардиологического стационара: ретроспективный анализ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6141-8994</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Переверзева</surname><given-names>К. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Pereverzeva</surname><given-names>K. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Переверзева Кристина Геннадьевна</p><p>ул. Высоковольтная, д. 9, Рязань, 390026</p></bio><bio xml:lang="en"><p>Kristina G. Pereverzeva</p><p>9 Vysokovoltnaya str., Ryazan, 390026</p></bio><email xlink:type="simple">pereverzevakg@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-2462-0839</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Черкасова</surname><given-names>Ю. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherkasova</surname><given-names>Yu. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Черкасова Юлия Олеговна</p><p>ул. Высоковольтная, д. 9, Рязань, 390026</p></bio><bio xml:lang="en"><p>Ulia O. Cherkasova</p><p>9 Vysokovoltnaya str., Ryazan, 390026</p></bio><email xlink:type="simple">ruju09082002@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-1525-963X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Корчагина</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Korchagina</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Корчагина Татьяна Алексеевна</p><p>ул. Высоковольтная, д. 9, Рязань, 390026</p></bio><bio xml:lang="en"><p>Tatiana A. Korchagina</p><p>9 Vysokovoltnaya str., Ryazan, 390026</p></bio><email xlink:type="simple">tany.korchagina2002@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-1393-6836</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иванов</surname><given-names>К. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Ivanov</surname><given-names>K. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Иванов Кирилл Сергеевич</p><p>ул. Высоковольтная, д. 9, Рязань, 390026</p></bio><bio xml:lang="en"><p>Kirill S. Ivanov</p><p>9 Vysokovoltnaya str., Ryazan, 390026</p></bio><email xlink:type="simple">kfulin@list.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Рязанский государственный медицинский университет им. акад. И. П. Павлова» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pavlov Ryazan State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>08</day><month>08</month><year>2026</year></pub-date><volume>22</volume><issue>3</issue><fpage>239</fpage><lpage>246</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Pereverzeva K.G., Cherkasova Y.O., Korchagina T.A., Ivanov K.S., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Переверзева К.Г., Черкасова Ю.О., Корчагина Т.А., Иванов К.С.</copyright-holder><copyright-holder xml:lang="en">Pereverzeva K.G., Cherkasova Y.O., Korchagina T.A., Ivanov K.S.</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://www.rpcardio.online/jour/article/view/3298">https://www.rpcardio.online/jour/article/view/3298</self-uri><abstract><p>Aim. To identify risk factors of in-hospital mortality in patients with hyponatremia in a cardiology hospital setting.Material and methods. This single-center retrospective study included 119 patients (mean age 71.2±12.7 years) admitted to a cardiology center from June 2024 to March 2025, who had at least one recorded instance of hypotonic hyponatremia (sodium level &lt;135 mmol/L). Patients with acute coronary syndrome and myocardial infarction were excluded. Statistical analysis was performed using logistic regression and ROC analysis.Results. The prevalence of hyponatremia was 4.1%. In-hospital mortality reached 16.0% (19 deaths). Hypervolemic hyponatremia, typical for patients with chronic heart failure, was the most common type (48.7%). According to multivariable regression analysis, factors associated with in-hospital mortality were minimum sodium level (OR 0.843; 95% СI 0.749-0.950; p=0.005), glomerular filtration rate (OR 0.957; 95% СI 0.921-0.991; p=0.021), and left ventricular ejection fraction (OR 0.949; 95% СI 0.907-0.994; p=0.027). The constructed predictive model demonstrated good discriminative ability: AUC=0.851 with sensitivity of 78.6%, specificity of 76.7%, and overall accuracy of 77.0%.Conclusion. Minimum serum sodium level is a risk factor of in-hospital death, particularly in patients with reduced glomerular filtration rate and left ventricular ejection fraction. </p></abstract><trans-abstract xml:lang="ru"><p>Цель. Определить факторы, ассоциированные с госпитальной летальностью у пациентов с гипонатриемией в условиях кардиологического стационара.Материал и методы. В одноцентровое ретроспективное исследование включено 119 пациентов (средний возраст 71,2±12,7 года), госпитализированных в кардиологический диспансер с июня 2024 по март 2025 гг., у которых хотя бы однократно за период госпитализации была зафиксирована гипотоническая гипонатриемия (уровень натрия &lt;135 ммоль/л). Из анализа исключались лица с острым коронарным синдромом и инфарктом миокарда. Результаты. Доля пациентов с гипонатриемией среди обследованных пациентов составила 4,1%. Госпитальная летальность достигла 16,0% (умерло 19 человек). Наиболее часто встречалась гиперволемическая гипонатриемия (48,7%), характерная для пациентов с хронической сердечной недостаточностью. По данным многофакторного регрессионного анализа факторами, ассоциированными с госпитальной летальностью, были минимальный уровень натрия (отношение шансов (OR) 0,843; 95% доверительный интервал (ДИ) 0,749-0,950; p=0,005), скорость клубочковой фильтрации (OR 0,957; 95% ДИ 0,921-0,991; p=0,021) и фракция выброса левого желудочка (OR 0,949; 95% ДИ 0,907 0,994; p=0,027). Построенная прогностическая модель продемонстрировала высокую дискриминационную способность: AUC=0,851 при чувствительности 78,6%, специфичности 76,7% и общей точности 77,0%.Заключение. Минимальный уровень натрия сыворотки крови является фактором, ассоциированным с риском смерти в госпитальном периоде, особенно у пациентов со сниженными скоростью клубочковой фильтрации и фракцией выброса левого желудочка.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гипонатриемия</kwd><kwd>натрий сыворотки крови</kwd><kwd>хроническая сердечная недостаточность</kwd><kwd>летальность</kwd><kwd>фракция выброса левого желудочка</kwd><kwd>скорость клубочковой фильтрации</kwd><kwd>гипертонический раствор натрия хлорида</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hyponatremia</kwd><kwd>serum sodium</kwd><kwd>chronic heart failure</kwd><kwd>mortality</kwd><kwd>left ventricular ejection fraction</kwd><kwd>glomerular filtration rate</kwd><kwd>hypertonic saline</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Spasovski G, Vanholder R, Allolio B, et al.; Hyponatraemia Guideline Development Group. 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