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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">Regional Anesthesia and Acute Pain Management</journal-id><journal-title-group><journal-title xml:lang="en">Regional Anesthesia and Acute Pain Management</journal-title><trans-title-group xml:lang="ru"><trans-title>Регионарная анестезия и лечение острой боли</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1993-6508</issn><issn publication-format="electronic">2687-1394</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">654070</article-id><article-id pub-id-type="doi">10.17816/RA654070</article-id><article-id pub-id-type="edn">VBMIAB</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</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">Use of ketamine infusion for postoperative analgesia in patients undergoing total knee arthroplasty: a prospective randomized single-center study</article-title><trans-title-group xml:lang="ru"><trans-title>Применение инфузии кетамина для послеоперационного обезболивания на примере пациентов после эндопротезирования коленного сустава: проспективное рандомизированное одноцентровое исследование</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0432-135X</contrib-id><contrib-id contrib-id-type="spin">5906-8022</contrib-id><name-alternatives><name xml:lang="en"><surname>Shcheparev</surname><given-names>Ivan S.</given-names></name><name xml:lang="ru"><surname>Щепарев</surname><given-names>Иван Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>is22@list.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1784-9540</contrib-id><contrib-id contrib-id-type="spin">4632-5664</contrib-id><name-alternatives><name xml:lang="en"><surname>Teplykh</surname><given-names>Boris A.</given-names></name><name xml:lang="ru"><surname>Теплых</surname><given-names>Борис Анатольевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>batru@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-3253-7351</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedotova</surname><given-names>Zhanna N.</given-names></name><name xml:lang="ru"><surname>Федотова</surname><given-names>Жанна Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>breyn3012@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Medical and Surgical Center named after N.I. Pirogov</institution></aff><aff><institution xml:lang="ru">Национальный медико-хирургический Центр имени Н.И. Пирогова</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-06-02" publication-format="electronic"><day>02</day><month>06</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2025</year></pub-date><volume>19</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>132</fpage><lpage>144</lpage><history><date date-type="received" iso-8601-date="2025-02-11"><day>11</day><month>02</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-04-28"><day>28</day><month>04</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://eco-vector.com/for_authors.php#07</ali:license_ref></license></permissions><self-uri xlink:href="https://rjraap.com/1993-6508/article/view/654070">https://rjraap.com/1993-6508/article/view/654070</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold><bold><italic> </italic></bold>Ketamine, an N-methyl-d-aspartate receptor antagonist with potent analgesic properties, is widely used in multimodal postoperative analgesia. This study aimed to evaluate its efficacy and safety for pain management following total knee arthroplasty, considering the risk of neuropsychiatric side effects.</p> <p><bold>AIM:</bold><bold> </bold>The work aimed to assess the efficacy and safety of ketamine use for postoperative analgesia after total knee arthroplasty.</p> <p><bold>METHODS:</bold><bold> </bold>A prospective, randomized, controlled trial included 68 patients (mean age 66.1 ± 7.4 years) undergoing total knee arthroplasty. The patients were randomized into two groups of 34 each: the study group received ketamine infusion, and the control group received standard postoperative analgesia. Primary outcomes included pain intensity measured using the Numerical Rating Scale (NRS), opioid requirements, and the incidence of adverse effects (nausea, vomiting, and neuropsychiatric side effects).</p> <p><bold>RESULTS:</bold><bold><italic> </italic></bold>Ketamine significantly lowered pain scores during the first 10 hours postoperatively (<italic>p</italic> = 0.03) and reduced morphine consumption in the study group (<italic>p</italic> = 0.0002) compared with the control group. However, the incidence of mild to moderate neuropsychiatric side effects was higher in the ketamine group (32.35% vs 0% in the control group; <italic>p</italic> = 0.0001, Fisher’s exact test). The rate of severe neuropsychiatric side effects was equal in both groups (2.94%). The rate of analgesic regimen failure was also similar in both groups (5.9%).</p> <p><bold>CONCLUSION:</bold><bold> </bold>The use of ketamine is an effective analgesic approach that reduces opioid requirements but is associated with an increased incidence of neuropsychiatric side effects (hallucinations, anxiety, disorientation). Optimizing dosing and administration regimens may reduce side effect rates, positioning ketamine as a valuable component of multimodal analgesia.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold><bold> </bold>Кетамин — антагонист NMDA-рецепторов с выраженными анальгезирующими свойствами, широко применяемый в мультимодальной послеоперационной анальгезии. Настоящее исследование направлено на оценку его эффективности и безопасности при обезболивании после эндопротезирования коленного сустава с учётом риска нейропсихических эффектов.</p> <p><bold>Цель</bold> — оценка эффективности и безопасности применения кетамина для послеоперационного обезболивания после эндопротезирования коленного сустава.</p> <p><bold>Материалы</bold><bold> </bold><bold>и</bold><bold> </bold><bold>методы.</bold><bold> </bold>В проспективном рандомизированном контролируемом исследовании приняли участие 68 пациентов (средний возраст 66,1±7,4 года), которым проводилось эндопротезирование коленного сустава. Пациенты были разделены на две группы по 34 пациента: исследуемая группа, получавшая инфузию кетамина, и группа сравнения, получавшая стандартную послеоперационную анальгезию. Основными оцениваемыми параметрами были интенсивность боли по числовой рейтинговой шкале NRS, потребность в опиоидах и частота побочных эффектов (тошнота, рвота, нейропсихические побочные эффекты).</p> <p><bold>Результаты.</bold><bold> </bold>Применение кетамина привело к значимому снижению уровня боли в первые 10 часов после операции (<italic>p</italic><italic>=</italic>0,03) и уменьшению потребности в морфине у исследуемой группы (<italic>p</italic><italic>=</italic>0,0002) по сравнению с контрольной группой. Однако частота отрицательных нейропсихических эффектов лёгкой и средней степени тяжести в группе кетамина была выше (у 32,35% пациентов против 0% в контрольной группе; <italic>p</italic><italic>=</italic>0,0001 по критерию Фишера). Тяжёлые нейропсихические побочные эффекты оказались одинаковы в обеих группах (по 2,94%). Процент неэффективности схемы обезболивания оказался одинаковым в обеих группах (5,9%).</p> <p><bold>Заключение.</bold><bold> </bold>Применение кетамина — эффективный метод обезболивания, который снижает потребность в опиоидах, однако сопровождается повышенной частотой побочных нейропсихических эффектов (галлюцинации, тревожные состояния, дезориентация). Оптимизация доз и режимов введения может уменьшить частоту побочных эффектов, делая кетамин важным компонентом мультимодальной аналгезии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ketamine</kwd><kwd>hyperalgesia</kwd><kwd>total knee arthroplasty</kwd><kwd>postoperative pain</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кетамин</kwd><kwd>гипералгезия</kwd><kwd>эндопротезирование коленного сустава</kwd><kwd>послеоперационная боль</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Mao J. Opioid-induced hyperalgesia. 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