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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">Kazan medical journal</journal-id><journal-title-group><journal-title xml:lang="en">Kazan medical journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Казанский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0368-4814</issn><issn publication-format="electronic">2587-9359</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">71941</article-id><article-id pub-id-type="doi">10.17816/kazmj71941</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">About changes in the blood coagulation system during anticoagulation therapy</article-title><trans-title-group xml:lang="ru"><trans-title>Об изменениях в коагуляционной системе крови при антикоагуляционной терапии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chizhevskaya</surname><given-names>S. I.</given-names></name><name xml:lang="ru"><surname>Чижевская</surname><given-names>С. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>info@eco-vector.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Institute for Advanced Training of Doctors</institution></aff><aff><institution xml:lang="ru">Государственный институт для усовершенствования врачей</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="1961-04-15" publication-format="electronic"><day>15</day><month>04</month><year>1961</year></pub-date><volume>42</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>24</fpage><lpage>27</lpage><history><date date-type="received" iso-8601-date="2021-06-22"><day>22</day><month>06</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-06-22"><day>22</day><month>06</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Chizhevskaya S.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Чижевская С.И.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Chizhevskaya S.I.</copyright-holder><copyright-holder xml:lang="ru">Чижевская С.И.</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/">http://creativecommons.org/licenses/by-nc-sa/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://kazanmedjournal.ru/kazanmedj/article/view/71941">https://kazanmedjournal.ru/kazanmedj/article/view/71941</self-uri><abstract xml:lang="en"><p>The experience of anticoagulation therapy has shown that control over the course and depth of action of anticoagulants by prothrombin time or prothrombin index is not entirely reliable. The reason for this is not only possible technical errors and the lack of standardization of thromboplastin, but also the complexity of the multi-unit "chain" coagulation process.</p></abstract><trans-abstract xml:lang="ru"><p>Опыт антикоагуляционной терапии показал, что контроль за ходом и глубиной действия антикоагулянтов по протромбиновому времени или протромбиновому индексу не вполне надежен. Причиной этого являются не только возможные технические погрешности и отсутствие стандартизации тромбопластина, но и сложность многозвеньевого «цепного» по характеру процесса коагуляции.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Kazan Medical archive</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Казанский медицинский архив</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Альперович Я. А. и Чернышева Н. И. 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