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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">medalphabet</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинский алфавит</journal-title><trans-title-group xml:lang="en"><trans-title>Medical alphabet</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2078-5631</issn><issn pub-type="epub">2949-2807</issn><publisher><publisher-name>ООО «Альфмед»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.33667/2078-5631-2026-2-47-50</article-id><article-id custom-type="elpub" pub-id-type="custom">medalphabet-5033</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Цианокобаламин-дефицитная полинейропатия при ингаляционном воздействии закиси азота и тиамин-дефицитная полинейропатия на фоне болезни Шарко – Мари – Тута 1-го типа: два клинических наблюдения</article-title><trans-title-group xml:lang="en"><trans-title>Cyancobalamine-deficiency polyneuropathy associated with nitrous oxide inhalation and thiamine-deficiency polyneuropathy in Charcot–Marie–Tooth disease type 1: two clinical cases</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3921-9555</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Руждий</surname><given-names>Н. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Ruzhdii</surname><given-names>N. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Руждий Надежда Федоровна, к. м. н., ассистент кафедры неврологии и мануальной медицины ФПО</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Ruzhdii Nadezhda F., PhD Med Sci, assistant at Dept of Neurology and Manual Medicine, Faculty of Postgraduate Education</p><p>St. Petersburg</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/0000-0003-3804-3877</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баранцевич</surname><given-names>Е. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Barantsevich</surname><given-names>E. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Баранцевич Евгений Робертович, д. м. н., проф., зав. кафедрой неврологии и мануальной медицины ФПО</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Barantsevich Evgeny R., Dr Med Sci (habil.), professor, head of Dept of Neurology and Manual Medicine, Faculty of Postgraduate Education</p><p>St. Petersburg</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/0000-0001-7946-0517</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лалаян</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lalayan</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лалаян Тигран Владимирович, к. м. н., доцент кафедры неврологии и мануальной медицины ФПО</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Lalayan Tigran V., PhD Med Sci, associate professor at Dept of Neurology and Manual Medicine, Faculty of Postgraduate Education</p><p>St. Petersburg</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/0009-0005-3132-8716</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Татарчук</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tatarchuk</surname><given-names>D. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татарчук Денис Валерьевич, студент лечебного факультета 6-го курса</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Tatarchuk Denis V., 6th-year student at Faculty of General Medicine</p><p>St. Petersburg</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/0000-0001-5649-6090</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Эмануэль</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Emanuel</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Эмануэль Юлия Владимировна, к. м. н., доцент кафедры неврологии и мануальной медицины ФПО</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Emanuel Yulia V., PhD Med Sci, associate professor at Dept of Neurology and Manual Medicine, Faculty of Postgraduate Education</p><p>St. Petersburg</p></bio><email xlink:type="simple">ejvcons@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет имени академика И. П. Павлова» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Academician I. P. Pavlov First St. Petersburg State Medical University (Pavlov 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>13</day><month>05</month><year>2026</year></pub-date><volume>0</volume><issue>2</issue><issue-title>Неврология и психиатрия (1)</issue-title><fpage>47</fpage><lpage>50</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Руждий Н.Ф., Баранцевич Е.Р., Лалаян Т.В., Татарчук Д.В., Эмануэль Ю.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Руждий Н.Ф., Баранцевич Е.Р., Лалаян Т.В., Татарчук Д.В., Эмануэль Ю.В.</copyright-holder><copyright-holder xml:lang="en">Ruzhdii N.F., Barantsevich E.R., Lalayan T.V., Tatarchuk D.V., Emanuel Y.V.</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.med-alphabet.com/jour/article/view/5033">https://www.med-alphabet.com/jour/article/view/5033</self-uri><abstract><sec><title>Цель исследования</title><p>Цель исследования. Демонстрация редких и сочетанных форм полинейропатий, возникающих вследствие дефицита витаминов на фоне экзогенной интоксикации (закись азота) и предсуществующей наследственной патологии (болезнь Шарко – Мари – Тута), с акцентом на обратимый характер симптомов при своевременной этиопатогенетической терапии.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Представлены два клинических наблюдения пациенток 27 и 29 лет с впервые выявленными полинейропатиями. Проведен комплексный анализ анамнестических данных (профессиональный, токсикологический, нутритивный, семейный), неврологического статуса, лабораторных показателей (витамин B12, тиамин), электронейромиографии и молекулярно-генетического тестирования.</p></sec><sec><title>Результаты</title><p>Результаты. В первом наблюдении у пациентки с профессиональным контактом с закисью азота выявлена В12-дефицитная полинейропатия, подтвержденная снижением уровня кобаламина и макроцитарной анемией. Во втором случае на фоне хронической алкогольной нагрузки диагностирован дефицит тиамина, при этом фенотипические особенности (деформация стоп) и результаты генетического тестирования позволили верифицировать болезнь Шарко – Мари – Тута 1-го типа (дупликация 17р11, ген PMP22). Назначенная заместительная терапия (цианокобаламин, тиамин) привела к регрессу парестезий, улучшению чувствительности и частичному восстановлению двигательных функций.</p></sec><sec><title>Заключение</title><p>Заключение. Представленные случаи иллюстрируют необходимость системного диагностического подхода при полинейропатиях, включающего оценку приобретенных дефицитных состояний даже при подтвержденной генетической патологии. Своевременная коррекция витаминной недостаточности обеспечивает значимый клинический ответ и улучшает качество жизни пациентов.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Objective</title><p>Objective. To demonstrate rare and combined forms of polyneuropathies resulting from vitamin deﬁciencies against the background of exogenous intoxication (nitrous oxide) and pre-existing hereditary pathology (Charcot–Marie–Tooth disease), emphasizing the reversible nature of symptoms with timely etiopathogenetic therapy.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Two clinical observations of 27- and 29-year-old female patients with newly diagnosed polyneuropathies are presented. A comprehensive analysis of anamnestic data (occupational, toxicological, nutritional, family history), neurological status, laboratory parameters (vitamin B12, thiamine), electroneuromyography, and molecular genetic testing was performed.</p></sec><sec><title>Results</title><p>Results. In the ﬁrst case, a patient with occupational exposure to nitrous oxide was diagnosed with B12-deﬁciency polyneuropathy, conﬁrmed by decreased cobalamin levels and macrocytic anemia. In the second case, against the background of chronic alcohol consumption, thiamine deﬁciency was detected; phenotypic features (foot deformity) and genetic testing results veriﬁed Charcot–Marie–Tooth disease type 1 (17p11 duplication, PMP22 gene). Prescribed replacement therapy (cyanocobalamin, thiamine) led to regression of paresthesia, improved sensitivity, and partial restoration of motor functions.</p></sec><sec><title>Conclusion</title><p>Conclusion. The presented cases illustrate the necessity of a systematic diagnostic approach for polyneuropathies, including assessment of acquired deﬁciency states even with conﬁrmed genetic pathology. Timely correction of vitamin deﬁciency provides a signiﬁcant clinical response and improves patients‘ quality of life.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>сочетанная этиология полинейропатии</kwd><kwd>ингаляционная токсическая нейропатия</kwd><kwd>В12-дефицитная полинейропатия</kwd><kwd>профессиональные полинейропатии</kwd><kwd>редкие причины нейропатии</kwd><kwd>редкая причина дефицита цианокобаламина</kwd></kwd-group><kwd-group xml:lang="en"><kwd>combined etiology of polyneuropathy</kwd><kwd>inhalational toxic neuropathy</kwd><kwd>B12-deficiency polyneuropathy</kwd><kwd>occupational polyneuropathies</kwd><kwd>rare causes of neuropathy</kwd><kwd>rare cause of cyanocobalamin deficiency</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">Левин О.С. Полиневропатии: Клиническое руководство. 3-е изд., испр. и доп. 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