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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">Pediatric Hematology/Oncology and Immunopathology</journal-id><journal-title-group><journal-title xml:lang="en">Pediatric Hematology/Oncology and Immunopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы гематологии/онкологии и иммунопатологии в педиатрии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-1708</issn><issn publication-format="electronic">2414-9314</issn><publisher><publisher-name xml:lang="en">Fund Doctors, Innovations, Science for Children</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">925</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2024-23-4-112-118</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Five-year experience in remote diagnosis of von Willebrand disease in Russia</article-title><trans-title-group xml:lang="ru"><trans-title>Пятилетний опыт удаленной диагностики болезни Виллебранда в России</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5209-2099</contrib-id><name-alternatives><name xml:lang="en"><surname>Poletaev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Полетаев</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><bold>Alexander V. Poletaev</bold>, Head of the Laboratory of Clinical Hemostasis</p><p><italic>1 Samory Mashela St., Moscow 117997</italic></p></bio><bio xml:lang="ru"><p><bold>Полетаев Александр Владимирович</bold>, заведующий лабораторией клинического гемостаза </p><p><italic>117997, Москва, ул. Саморы Машела, 1</italic></p></bio><email>poletaev_alexandr@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4384-6754</contrib-id><name-alternatives><name xml:lang="en"><surname>Zharkov</surname><given-names>P. A.</given-names></name><name xml:lang="ru"><surname>Жарков</surname><given-names>П. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Moscow </italic></p></bio><bio xml:lang="ru"><p><italic>Москва</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7534-3863</contrib-id><name-alternatives><name xml:lang="en"><surname>Seregina</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Серёгина</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Moscow </italic></p></bio><bio xml:lang="ru"><p><italic>Москва</italic></p></bio><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dubinina</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Дубинина</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Moscow </italic></p></bio><bio xml:lang="ru"><p><italic>Москва</italic></p></bio><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">The Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Center for Theoretical Problems of Physical and Chemical Pharmacology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">ФГБУН «Центр теоретических проблем физико-химической фармакологии» РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">The Russian Hemophilia Society Public Charity for the Disabled</institution></aff><aff><institution xml:lang="ru">Общероссийская благотворительная общественная организация инвалидов «Всероссийское общество гемофилии»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-13" publication-format="electronic"><day>13</day><month>12</month><year>2024</year></pub-date><volume>23</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>112</fpage><lpage>118</lpage><history><date date-type="received" iso-8601-date="2024-12-17"><day>17</day><month>12</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-12-17"><day>17</day><month>12</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">«D. Rogachev NMRCPHOI»</copyright-holder><copyright-holder xml:lang="ru">ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://hemoncim.com/jour/article/view/925">https://hemoncim.com/jour/article/view/925</self-uri><abstract xml:lang="en"><p>Accurate and timely laboratory diagnosis plays a key role in specifying the causes of hemorrhagic events both in children and adults. However, due to the rarity and diversity of some bleeding disorders, a full spectrum of laboratory testing may not be available in certain regions or hospitals. Taking into account these limitations, a programme of remote diagnosis of von Willebrand disease (VWD) was initiated in 2019. The aim of our study was to assess the results of the programme. In accordance with the study protocol, peripheral blood samples from patients suspected of VWD were collected at local healthcare facilities and, after initial sample preparation, were transferred to the Laboratory of Clinical Hemostasis of the Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology. Ethical approval was not required since the study only involved the use of anonymized and generalized retrospective data obtained during routine clinical practice. Coagulation analysis included tests for von Willebrand factor antigen (vWF:Ag), von Willebrand factor ristocetin cofactor activity (vWF:RCo), and factor VIII (FVIII) clotting activity. From 04 November 2019 to 31 December 2023, we received a total of 512 frozen samples from 375 children aged under 18 years (the mean age was 10 years (1 month – 17 years)) and 139 adult patients (the mean age was 35 (18–72) years) from 21 regions of the Russian Federation. Pre-analytical errors were identified in 42 (8.2%) cases. Decreased vWF activity (&lt; 50%) was found in 125 (26.6%) patients. VWF activity &lt; 30% was registered in 52 (11.1%) patients, while vWF:RCo &lt; 50% and &gt; 30% – in 73 (15.5%) cases. In 68 (54.4%) patients, laboratory findings were consistent with vWD type 1, in 50 (40%) cases testing results were indicative of vWD type 2, and 7 (5.6%) patients had vWD type 3. Thirty (6.4%) patients had decreased FVIII/vWF:Ag ratio. Type 2N VWD was found in one woman with low FVIII activity (the FVIII binding activity of VWF was 2%, normal range: 70–130%). The implementation of this programme has allowed us to specify a diagnosis in 125 patients without their in-person presence and regardless of their place of residence. This expands our possibilities of detecting VWD in patients living in regions with limited diagnostic capacity.</p></abstract><trans-abstract xml:lang="ru"><p>Качественная своевременная лабораторная диагностика является залогом успеха при уточнении причин геморрагических проявлений у детей и взрослых. Однако ввиду редкости и разнообразия конкретных патологий полный спектр лабораторных исследований может быть недоступен в отдельном регионе или лечебном учреждении. Учитывая эти ограничения, в 2019 г. стартовала программа удаленной диагностики болезни Виллебранда (БВ). Целью настоящего исследования являлась оценка результатов данной программы. В соответствии с протоколом исследования образцы периферической крови пациентов с подозрением на БВ отбирались на местах и далее после первичной пробоподготовки направлялись для анализа в лабораторию клинического гемостаза НМИЦ ДГОИ им. Дмитрия Рогачева. Данное исследование не требовало одобрения этическим комитетом, так как в нем использовались обобщенные ретроспективные деперсонифицированные данные, полученные в ходе рутинной клинической практики. Коагулологический анализ образцов включал определение концентрации антигена фактора фон Виллебранда (vWF:Ag), ристоцетинкофакторной активности vWF (vWF:RCo), а также активности фактора свертывания крови VIII (FVIII). Всего с 04.11.2019 по 31.12.2023 было получено 512 замороженных образцов от 375 детей в возрасте до 18 лет (средний возраст 10 лет (1 месяц – 17 лет) и 139 взрослых пациентов (средний возраст 35 (18–72) лет) из 21 региона Российской Федерации. Ошибки преаналитического этапа были обнаружены в 42 (8,2%) пробах. Cнижение активности vWF &lt; 50% отмечено у 125 (26,6%) пациентов. Активность vWF &lt; 30% выявлена у 52 (11,1%) пациентов, а vWF:RCo &lt; 50% и &gt; 30% – у 73 (15,5%). Лабораторная картина соответствовала 1-му типу БВ у 68 (54,4%) пациентов, 2-му типу – у 50 (40%) и 3-му типу – у 7 (5,6%). Снижение отношения активности FVIII к vWF:Ag выявлено у 30 (6,4%) пациентов. У 1 женщины с низким уровнем FVIII был установлен 2N тип БВ (активность связывания FVIII с vWF – 2% (нормальные значения 70–130%)). Внедрение данной программы позволило уточнить диагноз у 125 пациентов без их очного присутствия вне зависимости от места жительства, что расширяет возможности выявления БВ у пациентов, проживающих в регионах с ограниченным диагностическим потенциалом.</p></trans-abstract><kwd-group xml:lang="en"><kwd>von Willebrand disease</kwd><kwd>children</kwd><kwd>bleeding</kwd><kwd>diagnosis</kwd><kwd>hemorrhage syndrome</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>болезнь Виллебранда</kwd><kwd>дети</kwd><kwd>кровотечение</kwd><kwd>фактор</kwd><kwd>диагностика</kwd><kwd>геморрагический синдром</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Leebeek F.W.G., Eikenboom J.C.J. Von Willebrand’s Disease. N Engl J Med 2016; 375 (21): 2067–80.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Rodeghiero F., Castaman G., Dini E. Epidemiological investigation of the prevalence of von Willebrand’s disease. 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