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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Allergy</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Allergy</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский Аллергологический Журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1810-8830</issn><issn publication-format="electronic">2686-682X</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">17086</article-id><article-id pub-id-type="doi">10.36691/RJA17086</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Case reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинические случаи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Long-term prevention of hereditary angioedema in young children</article-title><trans-title-group xml:lang="ru"><trans-title>Долгосрочная профилактика наследственного ангиоотёка у ребенка раннего возраста</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1697-7425</contrib-id><contrib-id contrib-id-type="spin">5418-4330</contrib-id><name-alternatives><name xml:lang="en"><surname>Tarshina</surname><given-names>Elena A.</given-names></name><name xml:lang="ru"><surname>Таршина</surname><given-names>Елена Алексеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>maiorova.1994@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5039-8473</contrib-id><contrib-id contrib-id-type="spin">9722-7961</contrib-id><name-alternatives><name xml:lang="en"><surname>Pampura</surname><given-names>Alexander N.</given-names></name><name xml:lang="ru"><surname>Пампура</surname><given-names>Александр Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Med.), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>apampura@pedklin.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1606-205X</contrib-id><contrib-id contrib-id-type="spin">2063-7973</contrib-id><name-alternatives><name xml:lang="en"><surname>Latysheva</surname><given-names>Elena A.</given-names></name><name xml:lang="ru"><surname>Латышева</surname><given-names>Елена Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>д-р мед. наук., вед. науч. сотр.</p></bio><email>ealat@mail.ru</email><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Department of Innovative Pediatrics and Pediatric Surgery, Faculty of Continuing Professional Education, N.I. Pirogov Russian National Research Medical University</institution></aff><aff><institution xml:lang="ru">Кафедра инновационной педиатрии и детской хирургии Факультета дополнительного профессионального образования Российского Национального Исследовательского Медицинского Университета им. Н. И. Пирогова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Veltischev Research Clinical Institute of Pediatrics and Pediatric Surgery, Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский клинический институт педиатрии и детской хирургии имени академика Ю.Е. Вельтищева ФГАОУ ВО РНИМУ им. Н. И. Пирогова Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Morozov Children's City Clinical Hospital, Department of Health of the City of Moscow</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Морозовская детская городская клиническая больница ДЗМ»</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Russian Medical Academy of Continuous Professional Education</institution></aff><aff><institution xml:lang="ru">Российская медицинская академия непрерывного профессионального образования</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">National Research Center – Institute of Immunology Federal Medical-Biological Agency of Russia</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение «Государственный научный центр «Институт иммунологии» Федерального медико-биологического агентства</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-04-17" publication-format="electronic"><day>17</day><month>04</month><year>2026</year></pub-date><volume>23</volume><issue>2</issue><issue-title xml:lang="ru"/><history><date date-type="received" iso-8601-date="2025-11-26"><day>26</day><month>11</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-04-01"><day>01</day><month>04</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; , ABV-press</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; , ИД "АБВ-пресс"</copyright-statement><copyright-holder xml:lang="en">ABV-press</copyright-holder><copyright-holder xml:lang="ru">ИД "АБВ-пресс"</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2028-04-17"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://rusalljournal.ru/raj/user</ali:license_ref></license></permissions><self-uri xlink:href="https://rusalljournal.ru/raj/article/view/17086">https://rusalljournal.ru/raj/article/view/17086</self-uri><abstract xml:lang="en"><p/><title>We present a clinical case of early-onset and severe hereditary angioedema (HAE) type 1, caused by a pathogenic variant in the SERPING1 gene, in a two-year-old girl. HAE onset occurred at 18 months, which is extremely early for this disorder. Moreover, the onset was very rapid, with frequent, debilitating episodes of angioedema of the face, upper and lower extremities (over 8 months, the child experienced 14 episodes of angioedema: 5 in the face and 9 peripherally). Due to such an early onset and severe course of HAE, long-term prophylaxis with lanadelumab was initiated. After more than 5 months of therapy, the child has not experienced a single episode of angioedema, despite exposure to provoking factors. No side effects were observed. In the literature, we found descriptions of only five clinical cases with onset and a definitive diagnosis of HAE in children under 24 months of age, with only one of the five requiring long-term prophylaxis. Thus, we present a unique clinical example of the successful use of lanadelumab as long-term prophylaxis in an infant.</title></abstract><trans-abstract xml:lang="ru"><p>Представляем клинический случай ранней манифестации и тяжелого течения наследственного ангиоотёка (НАО) I типа, обусловленного патогенным вариантом в гене <italic>SERPING1</italic>, у девочки двухлетнего возраста. Дебют НАО произошел в полтора года, что чрезвычайно рано для данной патологии. Причем манифестация очень бурная, с частыми, изнуряющими эпизодами ангиоотёков лица, верхних и нижних конечностей (за 8 месяцев у ребенка зарегистрировано 14 эпизодов ангиоотёков: 5 в области лица и 9 периферических). В связи со столь ранней манифестацией и тяжелым течением НАО была инициирована долгосрочная профилактика препаратом ланаделумаб. По прошествии более 5 месяцев терапии у ребенка не отмечалось ни одного эпизода ангиоотёка, несмотря на воздействие провоцирующих факторов. Побочных эффектов также не наблюдалось. В литературе нами найдено описание лишь пяти клинических случаев с дебютом и достоверно установленным диагнозом НАО у детей младше 24 месяцев, при этом долгосрочная профилактика потребовалась только одному ребёнку из пяти. Таким образом, мы представляем уникальный клинический пример успешного использования ланаделумаба в качестве долгосрочной профилактики у ребенка раннего возраста.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Hereditary angioedema</kwd><kwd>lanadelumab</kwd><kwd>long-term prophylaxis</kwd><kwd>infant</kwd><kwd>preschool child</kwd><kwd>case report.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Наследственный ангиоотёк</kwd><kwd>ланаделумаб</kwd><kwd>долгосрочная профилактика</kwd><kwd>дети раннего возраста</kwd><kwd>ранняя манифестация</kwd><kwd>клинический случай.</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">Sinnathamby ES, Issa PP, Roberts L, et al. Hereditary Angioedema: Diagnosis, Clinical Implications, and Pathophysiology. 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