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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">ksma</journal-id><journal-title-group><journal-title xml:lang="ru">Кубанский научный медицинский вестник</journal-title><trans-title-group xml:lang="en"><trans-title>Kuban Scientific Medical Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1608-6228</issn><issn pub-type="epub">2541-9544</issn><publisher><publisher-name>Kuban State Medical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25207/1608-6228-2024-31-5-41-72</article-id><article-id custom-type="elpub" pub-id-type="custom">ksma-3630</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>ОРИГИНАЛЬНЫЕ СТАТЬИ. МЕДИКО-БИОЛОГИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES. MEDICAL AND BIOLOGICAL SCIENCES</subject></subj-group></article-categories><title-group><article-title>Сократительная функция миокарда в посттравматическом периоде ушиба сердца у крыс с различной стрессоустойчивостью: доклиническое экспериментальное рандомизированное исследование</article-title><trans-title-group xml:lang="en"><trans-title>Myocardial contractile function in the post-traumatic period of cardiac contusion in rats with different stress resistance: A preclinical experimental randomized trial</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6775-323X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Золотов</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Zolotov</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Золотов Александр Николаевич — кандидат медицинских наук, доцент, доцент кафедры патофизиологии.</p><p>ул. Ленина, д. 12, Омск, 644099</p></bio><bio xml:lang="en"><p>Alexander N. Zolotov — Cand. Sci. (Med.), Assoc. Prof., Pathophysiology Department, Omsk State Medical University.</p><p>Lenina str., 12, Omsk, 644099</p></bio><email xlink:type="simple">azolotov@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/0000-0003-4606-3173</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ключникова</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Klyuchnikova</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ключникова Евгения Игоревна — аспирант кафедры патофизиологии.</p><p>ул. Ленина, д. 12, Омск, 644099</p></bio><bio xml:lang="en"><p>Evgenia I. Klyuchnikova — PhD student, Pathophysiology Department, Omsk State Medical University.</p><p>Lenina str., 12, Omsk, 644099</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6110-3933</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Корпачева</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Korpacheva</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Корпачева Ольга Валентиновна — доктор медицинских наук, профессор, заведующая кафедрой патофизиологии.</p><p>ул. Ленина, д. 12, Омск, 644099</p></bio><bio xml:lang="en"><p>Olga V. Korpacheva — Dr. Sci. (Med.), Prof., Head of Pathophysiology Department, Omsk State Medical University.</p><p>Lenina str., 12, Omsk, 644099</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0063-3433</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Приймак</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Priymak</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Приймак Антон Борисович — кандидат медицинских наук, ассистент кафедры патофизиологии.</p><p>ул. Ленина, д. 12, Омск, 644099</p></bio><bio xml:lang="en"><p>Anton B. Priymak — Cand. Sci. (Med.) Assistant, Pathophysiology Department, Omsk State Medical University.</p><p>Lenina str., 12, Omsk, 644099</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное образовательное учреждение высшего образования «Омский государственный медицинский университет» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Omsk State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>25</day><month>10</month><year>2024</year></pub-date><volume>31</volume><issue>5</issue><fpage>41</fpage><lpage>72</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Золотов А.Н., Ключникова Е.И., Корпачева О.В., Приймак А.Б., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Золотов А.Н., Ключникова Е.И., Корпачева О.В., Приймак А.Б.</copyright-holder><copyright-holder xml:lang="en">Zolotov A.N., Klyuchnikova E.I., Korpacheva O.V., Priymak A.B.</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://ksma.elpub.ru/jour/article/view/3630">https://ksma.elpub.ru/jour/article/view/3630</self-uri><abstract><p>Введение. В патогенезе ушиба сердца наряду с первично-травматическими и вторично-гипоксическими механизмами угнетения сократительной функции миокарда участвуют реакции организма, нацеленные на достижение адаптации к изменившимся условиям функционирования. Значительная часть этих реакций реализуется в рамках стресса. При этом выраженность стрессового компонента миокардиальной дисфункции во многом определяется индивидуальной стрессовой реактивностью организма. Цель исследования — оценить сократительную функцию и функциональные резервы миокарда крыс с высоким и низким уровнем стрессоустойчивости в посттравматическом периоде ушиба сердца. Методы. Доклиническое экспериментальное рандомизированное исследование проведено на 134 белых половозрелых нелинейных крысах-самцах массой около 270 г. Животные были разделены путем последовательного использования тестов «Открытое поле» и «Принудительное плавание» по Порсолту на 2 группы: группа 1 — низкоустойчивые к стрессу особи, группа 2 — высокоустойчивые к стрессу особи. В каждой группе животные были рандомизированы на контрольные и опытные подгруппы. В опытных подгруппах через 6, 12 и 24 ч после моделирования ушиба сердца исследовали силовые и скоростные показатели сократимости миокарда на модели изолированного сердца по Fallen. Итоговым показателем исследования явилась оценка значений силовых и скоростных показателей сократительной функции изолированных сердец крыс с низким и высоким уровнем стрессоустойчивости, в том числе в условиях нагрузки ритмом высокой частоты (от 4,0 до 8,3 Гц) в посттравматическом периоде ушиба сердца. Расчет полученных данных проводили при использовании программных комплексов MS Office 2013 (Microsoft Corporation, США), Statistica, v. 10 (StatSoft, США). Статистически значимые различия считали при уровне ошибки р &lt; 0,05. Результаты. Через 6, 12 и 24 ч после моделирования ушиба сердца зарегистрировано снижение силовых и скоростных показателей сократимости изолированных сердец в группе 1 и группе 2. У низкоустойчивых к стрессу животных непосредственно после периода стабилизации и при нагрузке ритмом высокой частоты силовые и скоростные показатели изолированного сердца были статистически значимо (p = 0,0008) ниже регистрируемых у высокоустойчивых к стрессу особей. При навязывании высокочастотного ритма у изолированных сердец опытной группы формировался дефект диастолы во всех исследовательских точках, при этом у высокоустойчивых к стрессу животных дефект диастолы формировался при навязывании частоты сокращений 300 мин-1 и выше, а у низкоустойчивых — при навязывании частоты сокращений 240 мин-1 и выше. При одной и той же частоте сердечных сокращений дефект диастолы у низкоустойчивых к стрессу животных был статистически значимо бóльше (p = 0,0008) в сравнении с высокоустойчивыми. Заключение. Посттравматический период экспериментального ушиба сердца характеризуется снижением силовых и скоростных показателей сократимости миокарда, снижением функциональных резервов миокарда вне зависимости от стрессоустойчивости. Высокая стрессоустойчивость организма ассоциирована с бóльшей сохранностью сократительной функции сердца и резервов сократимости, тогда как низкая стрессоустойчивость, напротив, ассоциирована с более значительной степенью миокардиальной дисфункции и более значительным снижением функциональных резервов травмированного сердца. Различия в степени выраженности сократительной дисфункции в условиях высокой и низкой устойчивости организма к стрессу могут объясняться различной степенью вторичного повреждения миокарда в зоне ушиба, обусловленных неодинаковым соотношением активности стресс-реализующих и стресс-лимитирующих механизмов, участвующих в формировании вторичного повреждения.</p></abstract><trans-abstract xml:lang="en"><p>Background. Pathogenesis of cardiac contusion involves primary traumatic and secondary hypoxic mechanisms of myocardial contractile function depression as well as body reactions aimed at adapting to altered environment. A significant part of these reactions is realized in the context of stress. The intensity of the stress component in myocardial dysfunction is largely determined by the individual stress reactivity of the body. Objectives. To assess the contractile function and functional reserves of the myocardium of rats with a high and low level of stress resistance in the post-traumatic period of cardiac contusion. Methods. A preclinical experimental randomized trial involved 134 white mature nonlinear male rats weighing about 270 g. The animals were divided by sequentially performed Open Field and Porsolt Forced Swim tests into 2 groups: group 1 — animals with low stress resistance, group 2 — animals with high stress resistance. Within each group, the animals were randomized into control and experimental subgroups. In the experimental subgroups, 6, 12 and 24 hours after simulating cardiac contusion, the force and rate indicators of myocardial contractility were evaluated using the Fallen isolated heart model. The summary measures of the study included assessing the contractile force and rate of isolated hearts of rats with low and high stress resistance, particularly under conditions of high-frequency rhythm load (ranging from 4.0 to 8.3 Hz) during the post-traumatic period of cardiac contusion. Data analysis was performed using software packages MS Office 2013 (Microsoft Corporation, USA) and Statistica, v. 10 (StatSoft, USA). The differences were considered to be statistically significant at p &lt; 0.05. Results. 6, 12 and 24 hours after simulating a cardiac contusion, contractile force and rate of isolated hearts decreased in group 1 and group 2. In low stress-resistant animals, immediately following the stabilization period and during high-frequency rhythm test, the contractility force and rate in isolated hearts were statistically significantly lower (p = 0.0008) compared to those recorded in highly stress-resistant individuals. During the stimulation of a high-frequency rhythm, isolated hearts in the experimental group revealed diastolic dysfunction at all time points. In highly stress-resistant animals, diastolic dysfunction occurred at a heart rate of 300 min-1 and above, whereas in low stress-resistant animals, it manifested at a heart rate of 240 min-1 and above. At the same heart rate, diastolic dysfunction in low stress-resistant animals was statistically significantly greater (p = 0.0008) compared to that of highly resistant animals. Conclusion. The post-traumatic period following experimental myocardial contusion is characterized by a reduction in the force and rate of myocardial contractility, as well as a decrease in functional reserves of the myocardium, regardless of stress resistance. High stress resistance is associated with better preservation of cardiac contractile function and contractility reserves, whereas low stress resistance correlates with a more pronounced degree of myocardial dysfunction and a significant reduction in functional reserves of the contused heart. Differences in the severity of contractile dysfunction under conditions of high and low body resistance to stress can be attributed to varying degrees of secondary myocardial damage in the contused area, resulting from the misbalance between stress-activating and stress-limiting mechanisms involved in the development of secondary damage.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ушиб сердца</kwd><kwd>изолированное сердце</kwd><kwd>сократимость миокарда</kwd><kwd>стрессоустойчивость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>cardiac contusion</kwd><kwd>isolated heart</kwd><kwd>myocardial contractility</kwd><kwd>stress resistance</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">Guan DW, Zhang XG, Zhao R, Lu B, Han Y, Hou ZH, Jia JT. 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