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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">738</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2023-22-3-146-155</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">Reticulocyte hemoglobin content as a marker of iron deficiency in premature newborns with very low birth weight. A simple tool for diagnosing iron deficiency</article-title><trans-title-group xml:lang="ru"><trans-title>Содержание гемоглобина в ретикулоцитах как маркер дефицита железа у недоношенных новорожденных с очень низкой массой тела при рождении. Простые методы диагностики дефицита железа</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9626-5481</contrib-id><name-alternatives><name xml:lang="en"><surname>Sharafutdinova</surname><given-names>D. R.</given-names></name><name xml:lang="ru"><surname>Шарафутдинова</surname><given-names>Д. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Diiana R. Sharafutdinova - Cand. Med. Sci., a senior researcher, an anesthesiologist-intensivist at the A.G. Antonov ICU of assistant of the Department of Continuing Professional Education and Simulation Technologies, NMRCOGP named after the Academician V.I. Kulakov; Associate Professor at the Department of Neonatology of the N.F. Filatov Clinical Institute for Children's Health, the I.M. Sechenov First MSMU.</p><p>2, building 4 Bolshaya Pirogovskaya St., Moscow 119435</p></bio><bio xml:lang="ru"><p>Шарафутдинова Дияна Рашидовна - кандидат медицинских наук, старший научный сотрудник, врач-анестезиологреаниматолог отделения реанимации и интенсивной терапии им. проф. А.Г. Антонова Института неонатологии и педиатрии; ассистент кафедры непрерывного профессионального образования и симуляционных технологий ФГБУ «НМИЦ АГП им. В.И. Кулакова» Минздрава России; доцент кафедры неонатологии Клинического института детского здоровья им. Н.Ф. Филатова Первый МГМУ им. И.М. Сеченова.</p><p>119435, Москва, ул. Большая Пироговская, 2, стр. 4</p></bio><email>dikarush@gmail.com</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/0000-0002-3741-0770</contrib-id><name-alternatives><name xml:lang="en"><surname>Balashova</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Балашова</surname><given-names>Е. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>e_balashova@oparina4.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kessler</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Кесслер</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>y_kessler@oparina4.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9657-5375</contrib-id><name-alternatives><name xml:lang="en"><surname>Sukhova</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Сухова</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>j_bezzubenko@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7628-8157</contrib-id><name-alternatives><name xml:lang="en"><surname>Kirtbaya</surname><given-names>A. R.</given-names></name><name xml:lang="ru"><surname>Киртбая</surname><given-names>А. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>a_kirtbaya@oparina4.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/0000-0001-5560-8759</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryndin</surname><given-names>А. Yu.</given-names></name><name xml:lang="ru"><surname>Рындин</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>dikarush@gmail.com</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/0000-0002-7990-0276</contrib-id><name-alternatives><name xml:lang="en"><surname>Ivanets</surname><given-names>T. Yu.</given-names></name><name xml:lang="ru"><surname>Иванец</surname><given-names>Т. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><email>t_ivanets@oparina4.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4153-133X</contrib-id><name-alternatives><name xml:lang="en"><surname>Ionov</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Ионов</surname><given-names>О. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>ФГБУ «Национальный медицинский исследовательский центр акушерства, гинекологии и перинатологии им. акад. В.И. Кулакова» Минздрава России</p></bio><email>o_ionov@oparina4.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Medical Research Center for Obstetrics, Gynecology and Perinatology named after the Academician V.I. Kulakov of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр акушерства, гинекологии и перинатологии им. акад. В.И. Кулакова» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">I.M. Sechenov First Moscow State Medical University of Ministry of Healthcare of the Russian Federation (Sechenov University)</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Первый Московский государственный медицинский университет им. И.М. Сеченова» Минздрава России (Сеченовский Университет)</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Research Clinical Institute of Childhood, Ministry of Healthcare of the Moscow Region</institution></aff><aff><institution xml:lang="ru">ГБУЗ МО «Научно-исследовательский клинический институт детства Министерства здравоохранения Московской области»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-10-03" publication-format="electronic"><day>03</day><month>10</month><year>2023</year></pub-date><volume>22</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>146</fpage><lpage>155</lpage><history><date date-type="received" iso-8601-date="2023-06-16"><day>16</day><month>06</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-07-03"><day>03</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2023</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/738">https://hemoncim.com/jour/article/view/738</self-uri><abstract xml:lang="en"><p>Reticulocyte hemoglobin content (RET-He) is a promising marker of iron deficiency (ID) in newborns. Objective: to determine the diagnostic value of RET-He as a marker of ID in premature newborns with very low birth weight (VLBW). We conducted a single-center retrospective cohort study, which included 66 premature infants admitted to the National Medical Research Center for Obstetrics, Gynecology and Perinatology named the Academician V.I. Kulakov of the Ministry of Healthcare of the Russian Federation. Data were obtained from January 2016 to December 2018. The gestational age ranged from 29 to 32 weeks. Laboratory examination included blood tests on the 1<sup>st</sup> and 3<sup>rd</sup> day of life, then every 10–14 days until the day of life, then every 10–14 days the Institute of Neonatology and Pediatrics;  discharge from hospital, and the measurements of serum iron, ferritin, transferrin on the 7<sup>th</sup> until the discharge from hospital. This clinical study was approved by the Biomedical Research Ethics Committee (Minutes No.12 of 17 November 2016) and the Scientific Council (Minutes No.19 of 29 November 2016) of the National Medical Research Center for Obstetrics, Gynecology and Perinatology named after the Academician V.I. Kulakov of Ministry of Healthcare of the Russian Federation. RET-He was the highest at birth and declined gradually thereafter in premature newborns reaching the lowest values after 3 weeks of life (median (interquartile range) 28.4 (25.8–34.8) pg (on the 1st day of life – 40.0 (35.7–41.9) pg and 33.5 (29.2–36.6) pg at the time of discharge). A low RET-He level was associated with low reticulocytes, with no changes in hemoglobin. There was a positive correlation between RET-He and MCH. D-He decreased from 1 to 42 days of life as a marker of increasing anemia. There was a negative correlation between RET-He and Hypo-He (p &lt; 0.005). Starting from 42 days of life, or by the time of discharge, 32% of premature infants (n = 21) had a low ferritin level and 77% (n = 51) of premature infants had a low RET-He level, of which 21 infants developed ID (a positive correlation between RET-He and ferritin after 42 days of life (r = 0.34, p = 0.046)). There was no correlation between RET-He and ferritin in newborns without ID. Also, there were no correlations between RET-He and iron and RET-He and transferrin. After 42 days of life, RET-He less than 28.4 pg was a marker of ID (sensitivity 83.3% and specificity 93.7%). Low RET-He, D-He, RBC-Hе and high microR, Hypo-He were the earliest markers of ID in premature infants which predicted a decrease in serum iron and ferritin levels. RET-He, D-Не and Hypo-He are biomarkers with accurate diagnostic value of ID in premature infants with VLBW.</p></abstract><trans-abstract xml:lang="ru"><p>Содержание гемоглобина в ретикулоцитах (RET-He), или эквивалент ретикулоцитов, отражает текущую доступность железа для эритропоэза и представляется многообещающим параметром для выявления дефицита железа (ДЖ) у новорожденных. Цель: определить диагностическую значимость RET-He в качестве маркера ДЖ у недоношенных новорожденных с очень низкой массой тела (ОНМТ) при рождении. В период с января 2016 г. по декабрь 2018 г. на базе отделений Института неонатологии и педиатрии ФГБУ «НМИЦ АГП им. В.И. Кулакова» Минздрава России мы провели одноцентровое ретроспективное когортное исследование, в которое были включены 66 недоношенных новорожденных с ОНМТ. Гестационный возраст детей составил от 29 до 32 недель. В течение неонатального периода детям проводилось лабораторное обследование: расширенный клинический анализ крови с оценкой показателей эритропоэза периферической крови в 1-е и 3-и сутки жизни (с. ж.), далее 1 раз в 10–14 дней до выписки из стационара, биохимический анализ крови с определением сывороточного железа, ферритина, трансферрина на 7-е с. ж., далее 1 раз в 10–14 дней до выписки из стационара. Данное клиническое исследование одобрено комиссией по этике биомедицинских исследований (протокол №12 от 17 ноября 2016 г.) и утверждено решением ученого совета (протокол №19 от 29 ноября 2016 г.) ФГБУ «НМИЦ АГП им. В.И. Кулакова» Минздрава России. У недоношенных новорожденных с ОНМТ от рождения и до выписки из стационара значения RET-He плавно снижались (в 1-е с. ж. медиана (интерквартильный размах, interquartile range) составила 40,0 (35,7–41,9) пг, достигая наименьших значений после 3-й недели жизни – 28,4 (25,8–34,8) пг) и соответствовали значениям 33,5 (29,2–36,6) пг на момент выписки. Снижение уровня RET-He сочеталось со снижением уровня ретикулоцитов, при этом уровень гемоглобина не изменялся. Были выявлены статистически значимые корреляции между RET-He и средним содержанием гемоглобина в эритроцитах. Показатель D-He снижался с 1-х по 42-е с. ж. на фоне нарастания анемии. Отмечалась отрицательная сильная корреляционная связь между RET-He и Hypo-He (p &lt; 0,005). Начиная с 42-х с. ж., или к моменту выписки отмечалось статистически значимое снижение ферритина у 32% детей (n = 21), а RET-He – у 77% (n = 51). Была обнаружена корреляционная связь между RET-He и ферритином лишь после 42-х с. ж. у 21 новорожденного с ОНМТ с признаками абсолютного ДЖ (r = 0,34, p = 0,046). Среди новорожденных без признаков абсолютного ДЖ значимых корреляций не выявлено. Между RET-He и железом и RET-He и трансферрином значимой связи выявлено не было. У недоношенных новорожденных с ОНМТ в возрасте более 42 с. ж. значения RET-He ≤ 28,4 пг соответствуют ДЖ (чувствительность 83,3% и специфичность 93,7%). Наиболее ранними диагностическими признаками ДЖ у недоношенных новорожденных с ОНМТ являлись снижение RET-He, D-Не, RBC-Hе, повышение MicroR, Hypo-He, предшествовавшие снижению сывороточного железа и ферритина. RET-He наряду с D-Не и Hypo-He обладает большой диагностической ценностью для ранней диагностики ДЖ у недоношенных новорожденных с ОНМТ.</p></trans-abstract><kwd-group xml:lang="en"><kwd>reticulocytes</kwd><kwd>reticulocyte hemoglobin content</kwd><kwd>iron deficiency</kwd><kwd>very low birth weight premature infant</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ретикулоциты</kwd><kwd>содержание гемоглобина в ретикулоцитах</kwd><kwd>эквивалент ретикулоцитов</kwd><kwd>дефицит железа</kwd><kwd>недоношенные новорожденные с очень низкой массой тела при рождении</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Не указан</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Christensen, R. D., Bahr, T. M., &amp; Ward, D. M. (2022). Iron deficiency in newborn infants: global rewards for recognizing and treating this silent malady. 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