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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">Pharmateca</journal-id><journal-title-group><journal-title xml:lang="en">Pharmateca</journal-title><trans-title-group xml:lang="ru"><trans-title>Фарматека</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2073-4034</issn><issn publication-format="electronic">2414-9128</issn><publisher><publisher-name xml:lang="en">Bionika Media</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">368195</article-id><article-id pub-id-type="doi">10.18565/pharmateca.2025.9.67-74</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Neurology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Неврология</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 case report. Severe central nervous system damage in vitamin K deficiency-related late-onset hemorrhagic syndrome</article-title><trans-title-group xml:lang="ru"><trans-title>Клиническое наблюдение. тяжёлое поражение центральной нервной системы при позднем витамин-К-дефицитном геморрагическом синдроме</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-9466-1081</contrib-id><name-alternatives><name xml:lang="en"><surname>Zizyukina</surname><given-names>Karina S.</given-names></name><name xml:lang="ru"><surname>Зизюкина</surname><given-names>Карина Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1424-9198</contrib-id><name-alternatives><name xml:lang="en"><surname>Burlakova</surname><given-names>Irina M.</given-names></name><name xml:lang="ru"><surname>Бурлакова</surname><given-names>Ирина Максимовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7305-9036</contrib-id><name-alternatives><name xml:lang="en"><surname>Sarkisyan</surname><given-names>Egine A.</given-names></name><name xml:lang="ru"><surname>Саркисян</surname><given-names>Егине Альбертовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand.Sci. (Med.), Associate Professor, Department of Hospital Pediatrics named after Academician V.A. Tabolin</p></bio><bio xml:lang="ru"><p>кандидат медицинских наук, доцент кафедры госпитальной педиатрии им. академика В.А. Таболина Института материнства и детства</p></bio><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7861-6778</contrib-id><name-alternatives><name xml:lang="en"><surname>Zhirkova</surname><given-names>Yulia V.</given-names></name><name xml:lang="ru"><surname>Жиркова</surname><given-names>Юлия Викторовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-3979-7002</contrib-id><name-alternatives><name xml:lang="en"><surname>Vaynshtein</surname><given-names>Natalya P.</given-names></name><name xml:lang="ru"><surname>Вайнштейн</surname><given-names>Наталья Петровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7118-4001</contrib-id><name-alternatives><name xml:lang="en"><surname>Romanova</surname><given-names>Darya A.</given-names></name><name xml:lang="ru"><surname>Романова</surname><given-names>Дарья Алексеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0002-1820-9956</contrib-id><name-alternatives><name xml:lang="en"><surname>Mitina</surname><given-names>Yulia Yu.</given-names></name><name xml:lang="ru"><surname>Митина</surname><given-names>Юлия Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2276-4592</contrib-id><name-alternatives><name xml:lang="en"><surname>Shatalov</surname><given-names>Vitaly G.</given-names></name><name xml:lang="ru"><surname>Шаталов</surname><given-names>Виталий Геннадьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sarkisian_ea@rsmu.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Pirogov Russian National Research Medical University</institution></aff><aff><institution xml:lang="ru">Российский национальный исследовательский медицинский университет им. Н.И. Пирогова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Speransky Children's City Clinical Hospital No. 9</institution></aff><aff><institution xml:lang="ru">Детская городская клиническая больница № 9 им. Г.Н. Сперанского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-29" publication-format="electronic"><day>29</day><month>12</month><year>2025</year></pub-date><volume>32</volume><issue>9</issue><fpage>67</fpage><lpage>74</lpage><history><date date-type="received" iso-8601-date="2026-01-18"><day>18</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Bionika Media</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, ООО «Бионика Медиа»</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Bionika Media</copyright-holder><copyright-holder xml:lang="ru">ООО «Бионика Медиа»</copyright-holder></permissions><self-uri xlink:href="https://journals.rcsi.science/2073-4034/article/view/368195">https://journals.rcsi.science/2073-4034/article/view/368195</self-uri><abstract xml:lang="en"><p><bold>Objective</bold><bold>: </bold>Presentation of the clinical case of vitamin K deficiency-related late-onset hemorrhagic syndrome in a full-term girl 43 days old who did not receive vitamin K prophylaxis for late-onset hemorrhagic disease of the newborn.</p> <p><bold>Key</bold><bold> </bold><bold>points</bold><bold>:</bold> Vitamin K deficiency-related late-onset hemorrhagic, better known as late-onset hemorrhagic disease of the newborn (ICD-10: P53), is a condition associated with vitamin K deficiency, leading to blood clotting disorders in children aged 8 days to 6 months. Intracranial hemorrhages, which often lead to residual neurological symptoms and death, pose a particular danger in late-onset vitamin K deficiency-related hemorrhagic syndrome. Contraindications to prophylactic administration of menadione (Vicasol) in the maternity hospital and the lack of availability of phytomenadione in the maternity hospital and outpatient care lead to the risk of developing hemorrhagic disease.</p> <p><bold>Description</bold><bold> </bold><bold>of</bold><bold> </bold><bold>the</bold><bold> </bold><bold>clinical</bold><bold> </bold><bold>case</bold><bold>: </bold>This article presents an observation of child V. with vitamin K deficiency-related late-onset hemorrhagic syndrome and severe hemorrhagic central nervous system damage.</p> <p><bold>Conclusion</bold><bold>: </bold>Prevention of vitamin K deficiency-related hemorrhagic syndrome is an essential intervention performed in the first hours of a newborn's life. Lack of vitamin K supplementation can lead to severe consequences, as confirmed by our clinical case. The diagnostic and treatment measures performed immediately after the child's admission to the hospital prevented a fatal outcome and achieved minimal neurological impairment.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель работы: </bold>представление клинического случая позднего витамин-К-дефицитного геморрагического синдрома у доношенной девочки 43 суток жизни, не получившей профилактику поздней геморрагической болезни новорожденных витамином К.</p> <p><bold>Основные положения: </bold>Поздняя форма витамин-К-дефицитного геморрагического синдрома, более известного как поздняя геморрагическая болезнь новорожденных (МКБ10: Р53) – состояние, связанное с недостатком витамина К, приводящее к нарушению свёртываемости крови у детей в возрасте от 8 суток до 6 месяцев жизни. Особую опасность при позднем витамин-К-дефицитном геморрагическом синдроме представляют внутричерепные кровоизлияния, часто приводящие к формированию резидуальной неврологической симптоматики и к летальному исходу. Противопоказания к профилактическому введению менадиона (викасола) в родильном доме, отсутствие доступности фитоменадиона на этапах родильного дома и амбулаторной помощи приводят к риску развития геморрагической болезни.</p> <p><bold>Описание клинического случая:</bold> В статье представлено наблюдение ребёнка В. с поздним витамин-К-дефицитным геморрагическим синдромом и тяжёлым поражением центральной нервной системы геморрагического характера.</p> <p><bold>Заключение: </bold>Профилактика витамин-К-дефицитного геморрагического синдрома является крайне необходимым вмешательством, проводимым в первые часы жизни новорождённого. Отсутствие дотации витамина К может приводить к тяжёлым последствиям, что подтверждает приведённый нами клинический случай. Проведённые лечебно-диагностические мероприятия сразу после поступления ребёнка в стационар позволили предотвратить летальный исход и добиться минимальных нарушений в неврологическом статусе.</p></trans-abstract><kwd-group xml:lang="en"><kwd>vitamin K deficiency-related hemorrhagic syndrome</kwd><kwd>late hemorrhagic disease of the newborn</kwd><kwd>vitamin K</kwd><kwd>intracranial hemorrhage</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>витамин-К-дефицитный геморрагический синдром</kwd><kwd>поздняя геморрагическая болезнь новорожденных</kwd><kwd>витамин К</kwd><kwd>внутричерепные кровоизлияния</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>McNinch A. Vitamin K deficiency bleeding: early history and recent trends in the United Kingdom. Early Hum Dev 2010;(86 Suppl 1):63–65. https://dx.doi.org/10.1016/j.earlhumdev.2010.01.017</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Townsend C.W. 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