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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">Kazan medical journal</journal-id><journal-title-group><journal-title xml:lang="en">Kazan medical journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Казанский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0368-4814</issn><issn publication-format="electronic">2587-9359</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">11527</article-id><article-id pub-id-type="doi">10.17816/KMJ2019-197</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Theoretical and clinical medicine</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Теоретическая и клиническая медицина</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 and methodological aspects in the diagnosis of magnesium deficiency in patients with paroxysmal atrial fibrillation</article-title><trans-title-group xml:lang="ru"><trans-title>Клинико-методологические аспекты в диагностике дефицита магния у пациентов с пароксизмальной фибрилляцией предсердий</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bozhko</surname><given-names>Ya G</given-names></name><name xml:lang="ru"><surname>Божко</surname><given-names>Яков Григорьевич</given-names></name></name-alternatives><email>yakov-bozhko@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Arkhipov</surname><given-names>M V</given-names></name><name xml:lang="ru"><surname>Архипов</surname><given-names>Михаил Викторович</given-names></name></name-alternatives><email>yakov-bozhko@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Belokonova</surname><given-names>N A</given-names></name><name xml:lang="ru"><surname>Белоконова</surname><given-names>Надежда Анатольевна</given-names></name></name-alternatives><email>yakov-bozhko@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kiseleva</surname><given-names>D V</given-names></name><name xml:lang="ru"><surname>Кисёлева</surname><given-names>Дарья Владимировна</given-names></name></name-alternatives><email>yakov-bozhko@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ural State Medical University</institution></aff><aff><institution xml:lang="ru">Уральский государственный медицинский университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">The Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of RAS</institution></aff><aff><institution xml:lang="ru">Институт геологии и геохимии им. А.Н. Заварицкого Уральского отделения РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-03-29" publication-format="electronic"><day>29</day><month>03</month><year>2019</year></pub-date><volume>100</volume><issue>2</issue><issue-title xml:lang="en">VOL 100, NO2 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 100, №2 (2019)</issue-title><fpage>197</fpage><lpage>203</lpage><history><date date-type="received" iso-8601-date="2019-03-29"><day>29</day><month>03</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Bozhko Y.G., Arkhipov M.V., Belokonova N.A., Kiseleva D.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Божко Я.Г., Архипов М.В., Белоконова Н.А., Кисёлева Д.В.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Bozhko Y.G., Arkhipov M.V., Belokonova N.A., Kiseleva D.V.</copyright-holder><copyright-holder xml:lang="ru">Божко Я.Г., Архипов М.В., Белоконова Н.А., Кисёлева Д.В.</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/">http://creativecommons.org/licenses/by-nc-sa/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://kazanmedjournal.ru/kazanmedj/article/view/11527">https://kazanmedjournal.ru/kazanmedj/article/view/11527</self-uri><abstract xml:lang="en"><p><bold>Aim.</bold> To determine magnesium deficiency in patients with paroxysmal atrial fibrillation using a comprehensive clinical and laboratory approach.</p> <p><bold>Methods.</bold> The prospective cohort study included 35 patients of the cardiology department of the Medical association «Novaya bolnitsa». The main group consisted of 22 patients with frequently recurrent paroxysmal atrial fibrillation, the control group - 13 patients without cardiac arrhythmias. The clinical status, Holter-monitoring of the electrocardiogram, the results of the clinical test for magnesium deficiency, laboratory parameters of calcium, magnesium in blood plasma and formed elements, magnesium in whole blood, free fatty acids and plasma osmolarity were evaluated.</p> <p><bold>Results.</bold> The clinical score of magnesium deficiency was significantly higher in patients from the main group compared to the control [16.5 (11÷21) vs 13 (8÷15), p &lt;0.001]. In the main group, there was a decrease of magnesium in the whole blood [0.55 (0.5÷0.59) vs 0.61 (0.58÷0.54), p=0.002] and inside the blood cells [0.68 (0.53÷1.29) vs 1.38 (1.29÷1.44), p &lt;0.001]. In patients with atrial fibrillation there is a shift of the ratio of calcium to magnesium in blood plasma [2.5 (2.5÷3) vs 2.9 (2.8÷3.15), p=0.029] and intracellularly [4.85 (2.62÷9.3) vs 1.7 (1.4÷1.95), p=0.002]. The redistribution of calcium and magnesium is influenced not only by the initial concentration of cations, but also by free fatty acids. The best redistribution was obtained when the concentration of free fatty acids was 900 µmol/l, magnesium 1 mmol/l, and calcium 3 mmol/l, which is consistent with the optimal value of cations in the blood plasma.</p> <p><bold>Conclusion.</bold> Patients with paroxysmal atrial fibrillation had a significantly lower magnesium content in whole blood and inside the blood cells; magnesium concentration in the cells and in whole blood closely correlated with the results of the clinical test for evaluating magnesium deficiency; intracellular magnesium content can be influenced by the complexing interaction with free fatty acids.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель.</bold> Определить наличие дефицита магния у пациентов с пароксизмальной фибрилляцией предсердий на основе применения комплексного клинико-лабораторного подхода.</p> <p><bold>Методы.</bold> В проспективное когортное исследование были включены 35 пациентов кардиологического отделения Медицинского объединения «Новая больница». Основную группу составили 22 пациента с часто рецидивирующей пароксизмальной формой фибрилляции предсердий, контрольную - 13 пациентов без пароксизмальных нарушений ритма сердца. Проводили оценку клинического статуса, данных холтеровского мониторирования электрокардиограммы, результатов клинического теста наличия дефицита магния, лабораторных показателей кальция, магния в плазме и форменных элементах крови, магния в цельной крови, свободных жирных кислот и осмолярности в плазме крови.</p> <p><bold>Результаты.</bold> Результат клинической оценки дефицита магния в баллах был достоверно выше у пациентов основной группы в сравнении с контрольной [16,5 (11÷21) против 13 (8÷15); p &lt;0,001]. В основной группе зарегистрировано снижение концентрации магния в цельной крови [0,55 (0,5÷0,59) против 0,61 (0,58÷0,54); p=0,002] и внутри форменных элементов [0,68 (0,53÷1,29) против 1,38 (1,29÷1,44); p &lt;0,001]. У пациентов с фибрилляцией предсердий установлено нарушение соотношения кальция и магния в плазме крови [2,5 (2,5÷3) против 2,9 (2,8÷3,15); p=0,029] и внутриклеточно [4,85 (2,62÷9,3) против 1,7 (1,4÷1,95); p=0,002]. На перераспределение кальция и магния может оказывать влияние исходная концентрация не только катионов, но и свободных жирных кислот. Наилучшее перераспределение было получено при концентрации свободных жирных кислот 900 мкмоль/л и содержании магния 1 ммоль/л, а кальция - 3 ммоль/л, что согласуется с оптимальным значением катионов в плазме крови.</p> <p><bold>Вывод.</bold> Пациенты с пароксизмальной фибрилляцией предсердий имели достоверно более низкое содержание магния в цельной крови и внутри ее форменных элементов в сравнении с пациентами без данной аритмии; концентрация магния внутри клеток и в цельной крови тесно коррелировала с результатами клинического теста оценки дефицита магния; на внутриклеточное содержание магния может оказывать влияние комплексообразующее взаимодействие со свободными жирными кислотами.</p></trans-abstract><kwd-group xml:lang="en"><kwd>paroxysmal atrial fibrillation</kwd><kwd>magnesium deficiency</kwd><kwd>intracellular magnesium</kwd><kwd>free fatty acids</kwd><kwd>calcium-magnesium index</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>пароксизмальная фибрилляция предсердий</kwd><kwd>дефицит магния</kwd><kwd>внутриклеточный магний</kwd><kwd>свободные жирные кислоты</kwd><kwd>кальциево-магниевый индекс</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">Kolte D., Vijayaraghavan K., Khera S. et al. 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