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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">bloodjour</journal-id><journal-title-group><journal-title xml:lang="ru">Гематология и трансфузиология</journal-title><trans-title-group xml:lang="en"><trans-title>Russian journal of hematology and transfusiology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0234-5730</issn><issn pub-type="epub">2411-3042</issn><publisher><publisher-name>ООО Издательский дом «Практика»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.35754/0234-5730-2026-71-2-251-257</article-id><article-id custom-type="elpub" pub-id-type="custom">bloodjour-769</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>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORTS</subject></subj-group></article-categories><title-group><article-title>Обнаружение фрагментов цитоплазмы мегакариоцитов в периферической крови при микроскопии</article-title><trans-title-group xml:lang="en"><trans-title>Detection of megakaryocytes cytoplasm fragments in peripheral blood by microscopy</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-5297-4541</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прокопьева</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Prokopyeva</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Прокопьева Марина Викторовна, врач клинической лабораторной диагностики клинико-диагностической лаборатории</p><p>194291, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Marina V. Prokopyeva, Clinical Laboratory Diagnostics Specialist at the Clinical and Diagnostic Laboratory </p><p>194291, Saint Petersburg</p></bio><email xlink:type="simple">marina_garlik@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-0606-3612</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нефедова</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nefedova</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нефедова Светлана Анатольевна, биолог клинико-диагностической лаборатории</p><p>194291, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Svetlana A. Nefedova, Biologist of the Clinical and Diagnostic Laboratory</p><p>194291, Saint Petersburg</p></bio><email xlink:type="simple">svetlana.07@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-1337-763X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вагабов</surname><given-names>З. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Vagabov</surname><given-names>Z. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вагабов Залимхан Самаилович, невролог палаты интенсивной терапии неврологического отделения</p><p>194291, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Zalimkhan S. Vagabov, neurologist of the Intensive Care unit of the Neurological Department</p><p>194291, Saint Petersburg</p></bio><email xlink:type="simple">wagabovz@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3840-1032</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Корноухова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kornoukhova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Корноухова Любовь Александровна, кандидат медицинских наук, заведующая клинико-диагностической лабораторией; доцент кафедры клинической лабораторной диагностики с курсом молекулярной медицины</p><p>194291, г. Санкт-Петербург</p><p>197022, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Lubov A. Kornoukhova, Cand. Sci. (Med.), Head of the Clinical and Diagnostic Laboratory; Associate Professor of the Department of Clinical Laboratory Diagnostics with a course in Molecular Medicine</p><p>194291, Saint Petersburg</p><p>197022, Saint Petersburg</p></bio><email xlink:type="simple">kornouchova@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГБУЗ «Ленинградская областная клиническая больница»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Leningrad Regional Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ГБУЗ «Ленинградская областная клиническая больница»; ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет имени академика И.П. Павлова» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Leningrad Regional Clinical Hospital; Pavlov First Saint Petersburg State Medical 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>17</day><month>07</month><year>2026</year></pub-date><volume>71</volume><issue>2</issue><fpage>251</fpage><lpage>257</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Прокопьева М.В., Нефедова С.А., Вагабов З.С., Корноухова Л.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Прокопьева М.В., Нефедова С.А., Вагабов З.С., Корноухова Л.А.</copyright-holder><copyright-holder xml:lang="en">Prokopyeva M.V., Nefedova S.A., Vagabov Z.S., Kornoukhova L.A.</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.htjournal.ru/jour/article/view/769">https://www.htjournal.ru/jour/article/view/769</self-uri><abstract><sec><title>Введение</title><p>Введение. Мегакариоциты, в дополнение к своей функции выработки тромбоцитов и поддержания их количественного состава в кровотоке, являются сильным иммунным триггером. Выход данных клеток из костного мозга в периферическую кровь возникает при определенных условиях как физиологического, так и патологического характера.</p></sec><sec><title>Цель</title><p>Цель: представить случай обнаружения у пожилого больного ишемическим инсультом фрагментов цитоплазмы мегакариоцитов при микроскопии мазка периферической крови.</p></sec><sec><title>Основные сведения</title><p>Основные сведения. При проведении клинического анализа крови у пожилого больного ишемическим инсультом на гематологическом анализаторе выявлена значительная тромбоцитопения, которая ранее не отмечалась. Количество тромбоцитов определено оптическим методом, но флаг агрегации тромбоцитов сохранялся (100 %). При морфологическом изучении крови под микроскопом обнаружены фрагменты цитоплазмы мегакариоцитов, расположенные в щеточке препаратов в виде кластеров, количество тромбоцитов соответствовало данным анализа. При повторном взятии материала количество тромбоцитов оставалось в норме. При микроскопической визуализации крови обнаружены тромбоциты в виде скоплений и отдельно лежащих форм. Таким образом, при повышенном потреблении тромбоцитов при ряде патологий индуцируется выброс фрагментов мегакариоцитов в циркулирующее русло, где и происходит их «дозревание». В течение нескольких часов демаркационная мембрана, образованная в мегакариоцитах, разделяет цитоплазму на многочисленные зрелые тромбоцитарные пластинки. С целью прогноза нарастающей тромбоцитопении и исключения ранней гепарин-индуцированной тромбоцитопении необходим отбор проб клинического анализа крови по определенным критериям.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Megakaryocytes, in addition to their function of producing platelets and maintaining their quantitative composition in the bloodstream, are a strong immune trigger. The release of these cells from the bone marrow into the peripheral blood occurs under certain conditions, both physiological and pathological.</p></sec><sec><title>Aim</title><p>Aim: to present a case of detecting fragments of megakaryocyte cytoplasm in an elderly patient with ischemic stroke during microscopy of a peripheral blood smear.</p></sec><sec><title>Main findings</title><p>Main findings. When conducting a clinical blood test on an elderly patient with an ischemic stroke, a hematological analyzer revealed significant thrombocytopenia, which had not been previously observed. The number of platelets was determined using the optical method, but the platelet aggregation flag remained (100 %). Morphological examination of blood under a microscope revealed fragments of megakaryocyte cytoplasm arranged in clusters in the brush preparations, and the number of platelets corresponded to the analysis data. Upon repeated blood sampling, the number of platelets remained normal. Microscopic examination of the blood revealed platelets in the form of clusters and individual forms. Thus, when platelets are consumed excessively in certain pathologies, fragments of megakaryocytes are released into the circulation, where they “mature”. Within a few hours, the demarcation membrane formed in megakaryocytes divides the cytoplasm into numerous mature platelet plates. In order to predict the progression of thrombocytopenia and exclude early heparin-induced thrombocytopenia, it is necessary to select blood samples for clinical analysis based on specific criteria.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>мегакариоциты</kwd><kwd>фрагменты цитоплазмы</kwd><kwd>тромбоцитопения</kwd><kwd>острое нарушение мозгового кровообращения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>megakaryocytes</kwd><kwd>fragments of cytoplasm</kwd><kwd>thrombocytopenia</kwd><kwd>acute cerebrovascular accident</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">Du C., Chen J., Wang J. New insights into the generation and function of megakaryocytes in health and disease. Haematologica. 2025;110(7):1500–12. DOI: 10.3324/haematol.2024.287236.</mixed-citation><mixed-citation xml:lang="en">Du C., Chen J., Wang J. 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