<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">cfpd</journal-id><journal-title-group><journal-title xml:lang="ru">Бюллетень физиологии и патологии дыхания</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin Physiology and Pathology of Respiration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-5029</issn><publisher><publisher-name>Дальневосточный научный центр физиологии и патологии дыхания</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.36604/1998-5029-2022-83-59-65</article-id><article-id custom-type="elpub" pub-id-type="custom">cfpd-1004</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>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL RESEARCH</subject></subj-group></article-categories><title-group><article-title>Нарушение маточно-плацентарно-плодового кровотока у беременных с внебольничными пневмоними бактериальной и вирусной (COVID-19) этиологии</article-title><trans-title-group xml:lang="en"><trans-title>Disturbance of utero-placental-fetus blood flow in pregnant women with community-acquired pneumonia of bacterial and viral (COVID-19) etiology</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абулдинов</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Аbuldinov</surname><given-names>А. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Антон Сергеевич Абулдинов, аспирант</p><p>675000</p><p>ул. Калинина, 22</p><p>Благовещенск</p></bio><bio xml:lang="en"><p>Anton S. Abuldinov, Postgraduate Student </p><p>675000</p><p>22 Kalinina Str., Blagoveshchensk</p><p>Blagoveshchensk</p></bio><email xlink:type="simple">abuldinov@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Андриевская</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Аndrievskaya</surname><given-names>I. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ирина Анатольевна Андриевская, д-р биол. наук, профессор, зав. лабораторией</p><p>лаборатория механизмов этиопатогенеза и восстановительныхпроцессов дыхательной системы при неспецифических заболеванияхлегки</p><p>675000</p><p>ул. Калинина, 22</p><p>Благовещенск</p></bio><bio xml:lang="en"><p>Irina A. Andrievskaya, PhD, DSc (Biol.), Professor, Head of Laboratory</p><p>Laboratory of Mechanisms of Etiopathogenesis and Recovery Processes of the Respiratory System at Non-Specific Lung Diseases</p><p>675000</p><p>22 Kalinina Str., Blagoveshchensk</p><p>Blagoveshchensk</p></bio><email xlink:type="simple">irina-andrievskaja@rambler.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Федеральное государственное бюджетное научное учреждение «Дальневосточный научный центр физиологии и патологии дыхания»<country>Россия</country></aff><aff xml:lang="en">Far Eastern Scientific Center of Physiology and Pathology of Respiration<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Федеральное государственное бюджетное научное учреждение «Дальневосточный научный центр физиологии и патологии дыхания»;  РАН<country>Россия</country></aff><aff xml:lang="en">Far Eastern Scientific Center of Physiology and Pathology of Respiration; RAS<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>23</day><month>04</month><year>2022</year></pub-date><volume>0</volume><issue>83</issue><fpage>59</fpage><lpage>65</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Абулдинов А.С., Андриевская И.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Абулдинов А.С., Андриевская И.А.</copyright-holder><copyright-holder xml:lang="en">Аbuldinov А.S., Аndrievskaya I.А.</copyright-holder><license 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://cfpd.elpub.ru/jour/article/view/1004">https://cfpd.elpub.ru/jour/article/view/1004</self-uri><abstract><sec><title>   Введение</title><p>   Введение. Плацентарная недостаточность входит в число наиболее часто развивающихся осложнений у беременных с острой дыхательной недостаточностью, являющейся следствием внебольничных пневмоний (ВП), в том числе вирусной этиологии. Влияние COVID-19 инфекции на течение беременности, состояние плода и новорождённых изучено недостаточно.</p></sec><sec><title>   Цель</title><p>   Цель. Изучить состояние маточно-плацентарно-плодового кровообращения, плаценты и плода у женщин с бактериальной и COVID-19-ассоциированной ВП во втором и в третьем триместрах беременности.</p></sec><sec><title>   Материалы и методы</title><p>   Материалы и методы. Проанализированы истории родов и результаты обследований 120 женщин во втором и третьем триместрах беременности, из них 37 женщин с ВП средней степени тяжести бактериальной этиологии, 48 женщин с COVID-19 инфекцией. Группу сравнения составили 35 женщин с неосложненным течением беременности. Проводили оценку состояния плаценты и плода по данным ультразвукового и маточно-плацентарно-плодового кровотока – допплерографического исследования. Анализировались пульсационные индексы (ПИ) и церебро-плацентарное отношение (ЦПО).</p></sec><sec><title>   Результаты</title><p>   Результаты. По нашим данным, риск развития хронической плацентарной недостаточности у беременных с COVID-19-ассоциированной ВП средней степени тяжести был выше, чем в группах женщин с ВП бактериальной этиологии и в группе сравнения. В группах с ВП выявлены значимые различия в показателях ЦПО, ПИ маточных артерий, артерий пуповины и средней мозговой артерии, соответствующие I (А, Б) или II степени нарушения маточно-плацентарного и/или плацентарно-плодового кровотока. Хроническая внутриутробная гипоксия плода и задержка роста плода были чаще выявлены в группе с COVID-19-ассоциированной ВП. Новорождённые, рождённые от матерей с COVID-19 инфекцией, имели повышенный риск неонатальных повреждений центральной нервной системы (ЦНС).</p></sec><sec><title>   Заключение</title><p>   Заключение. COVID-19-ассоциированная ВП в сравнении с ВП бактериальной этиологии увеличивает риск хронической плацентарной недостаточности, внутриутробной гипоксии плода и задержки роста плода, развития неонатальных повреждений ЦНС.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>   Introduction</title><p>   Introduction. Placental insufficiency is one of the most frequently developing complications in pregnant women with acute respiratory failure, which is a consequence of community-acquired pneumonia (CAP), including viral etiology. The impact of COVID-19 infection on the course of pregnancy, the condition of the fetus and newborns has not been studied enough.</p></sec><sec><title>   Aim</title><p>   Aim. To study the state of uteroplacental-fetal circulation, placenta and fetus in women with bacterial and COVID-19-associated CAP in the second and third trimesters of pregnancy.</p></sec><sec><title>   Materials and methods</title><p>   Materials and methods. The history of childbirth and the results of examinations of 120 women in the second and third trimesters of pregnancy were analyzed, including 37 women with moderate CAP of bacterial etiology, 48 women with COVID-19 infection. The comparison group consisted of 35 women with uncomplicated pregnancy. The state of the placenta and fetus was assessed according to the data of ultrasound and utero-placental-fetal blood flow – Doppler study. Pulsation indices (PI) and cerebro-placental ratio (CPR) were analyzed.</p></sec><sec><title>   Results</title><p>   Results. According to our data, the risk of developing chronic placental insufficiency in pregnant women with COVID-19-associated CAP of moderate severity was higher than in groups of women with CAP of bacterial etiology and in the comparison group. In groups with CAP, significant differences were found in the indices of CPR, PI of the uterine arteries, umbilical cord arteries and middle cerebral artery, corresponding to I (A, B) or II degree of disturbance of the uteroplacental and/or placental-fetal blood flow. Chronic intrauterine fetal hypoxia and fetal growth retardation were more frequently detected in the group with COVID-19-associated CAP. Newborns born to mothers with COVID-19 infection have an increased risk of neonatal damage to the central nervous system (CNS).</p></sec><sec><title>   Conclusion</title><p>   Conclusion. COVID-19-associated CAP, compared with CAP of bacterial etiology, increases the risk of chronic placental insufficiency, intrauterine fetal hypoxia and fetal growth retardation, and the development of neonatal CNS damage.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>внебольничная пневмония</kwd><kwd>беременность</kwd><kwd>маточно-плацентарный кровоток</kwd><kwd>плодовый кровоток</kwd><kwd>плацентарная недостаточность</kwd><kwd>COVID-19</kwd></kwd-group><kwd-group xml:lang="en"><kwd>community-acquired pneumonia</kwd><kwd>pregnancy</kwd><kwd>uteroplacental blood flow</kwd><kwd>fetal blood flow</kwd><kwd>placental insufficiency</kwd><kwd>COVID-19</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Исследование проводилось без участия спонсоров</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>This study was not sponsored</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Nardozza L. M., Caetano A. C., Zamarian A. C., Mazzola J. B., Silva C. P., Marçal V. M., Lobo T. F., Peixoto A. B., Araujo Júnior E. Fetal growth restriction: current knowledge // Arch. Gynecol. Obstet. 2017. Vol.295, Iss. 5. P. 1061–1077. https://doi.org/10.1007/s00404-017-4341-9</mixed-citation><mixed-citation xml:lang="en">Nardozza L. M., Caetano A. C., Zamarian A. C., Mazzola J. B., Silva C. P., Marçal V. M., Lobo T. F., Peixoto A. B., Araujo Júnior E. Fetal growth restriction: current knowledge // Arch. Gynecol. Obstet. 2017. Vol.295, Iss. 5. P. 1061–1077. https://doi.org/10.1007/s00404-017-4341-9</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Audette M. C., Kingdom J. C. Screening for fetal growth restriction and placental insufficiency // Semin. Fetal Neonatal Med. 2018. Vol.23, Iss.2. P. 119–125. https://doi.org/10.1016/j.siny.2017.11.004</mixed-citation><mixed-citation xml:lang="en">Audette M. C., Kingdom J. C. Screening for fetal growth restriction and placental insufficiency // Semin. Fetal Neonatal Med. 2018. Vol.23, Iss.2. P. 119–125. https://doi.org/10.1016/j.siny.2017.11.004</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">ACOG Practice Bulletin №204: Fetal Growth Restriction // Obstet. Gynecol. 2019. Vol. 133, Iss. 2. P. e97-e109. https://doi.org/10.1097/AOG.0000000000003070</mixed-citation><mixed-citation xml:lang="en">ACOG Practice Bulletin №204: Fetal Growth Restriction // Obstet. Gynecol. 2019. Vol. 133, Iss. 2. P. e97-e109. https://doi.org/10.1097/AOG.0000000000003070</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Zur R. L., Kingdom J. C., Parks W. T., Hobson S. R. The Placental Basis of Fetal Growth Restriction // Obstet. Gynecol. Clin. North Am. 2020. Vol. 47, Iss.1. P. 81–98. https://doi.org/10.1016/j.ogc.2019.10.008</mixed-citation><mixed-citation xml:lang="en">Zur R. L., Kingdom J. C., Parks W. T., Hobson S. R. The Placental Basis of Fetal Growth Restriction // Obstet. Gynecol. Clin. North Am. 2020. Vol. 47, Iss.1. P. 81–98. https://doi.org/10.1016/j.ogc.2019.10.008</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Gagnon R. Placental insufficiency and its consequences // Eur. J. Obstet. Gynecol. Reprod. Biol. 2003. Vol.110, Iss.1. P.99–107. https://doi.org/10.1016/s0301-2115(03)00179-9</mixed-citation><mixed-citation xml:lang="en">Gagnon R. Placental insufficiency and its consequences // Eur. J. Obstet. Gynecol. Reprod. Biol. 2003. Vol.110, Iss.1. P.99–107. https://doi.org/10.1016/s0301-2115(03)00179-9</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Кривчик Г. В. Фетоплацентарная недостаточность и перинатальные инфекции / Г. В. Кривчик, Е. Н. Кравченко, Г. Б. Безнощенко // Омский научный вестник. – 2007. – № 1. – С. 99–101.</mixed-citation><mixed-citation xml:lang="en">Krivchik G. V., Kravchenko E. N., Beznoshchenko G. B. [Fetoplacental insufficiency and perinatal infections]. Omskiy nauchnyy vestnik 2007; 1: 99–101 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Hollingsworth H. M., Irwin R. S. Acute respiratory failure in pregnancy // Clin. Chest Med. 1992. Vol.13, Iss.4. P. 723–740.</mixed-citation><mixed-citation xml:lang="en">Hollingsworth H. M., Irwin R. S. Acute respiratory failure in pregnancy // Clin. Chest Med. 1992. Vol.13, Iss.4. P. 723–740.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Rabiei M., Soori T., Abiri A., Farsi Z., Shizarpour A., Pirjani R. Maternal and fetal effects of COVID-19 virus on a complicated triplet pregnancy: a case report // J. Med. Case Rep. 2021. Vol. 15, Iss.1. Article number: 87. https://doi.org/10.1186/s13256-020-02643-y</mixed-citation><mixed-citation xml:lang="en">Rabiei M., Soori T., Abiri A., Farsi Z., Shizarpour A., Pirjani R. Maternal and fetal effects of COVID-19 virus on a complicated triplet pregnancy: a case report // J. Med. Case Rep. 2021. Vol. 15, Iss.1. Article number: 87. https://doi.org/10.1186/s13256-020-02643-y</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Dang D., Wang L., Zhang C., Li Z., Wu H. Potential effects of SARS-CoV-2 infection during pregnancy on fetuses and newborns are worthy of attention // J. Obstet. Gynaecol. Res. 2020. Vol. 46, Iss.10. P. 1951–1957. https://doi.org/10.1111/jog.14406</mixed-citation><mixed-citation xml:lang="en">Dang D., Wang L., Zhang C., Li Z., Wu H. Potential effects of SARS-CoV-2 infection during pregnancy on fetuses and newborns are worthy of attention // J. Obstet. Gynaecol. Res. 2020. Vol. 46, Iss.10. P. 1951–1957. https://doi.org/10.1111/jog.14406</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Goodnight W. H., Soper D. E. Pneumonia in pregnancy // Crit. Care Med. 2005. Vol.33, Iss.10(Suppl.). P. S390–S397. https://doi.org/10.1097/01.ccm.0000182483.24836.66</mixed-citation><mixed-citation xml:lang="en">Goodnight W. H., Soper D. E. Pneumonia in pregnancy // Crit. Care Med. 2005. Vol.33, Iss.10(Suppl.). P. S390–S397. https://doi.org/10.1097/01.ccm.0000182483.24836.66</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">He Y. J., Mai C. Y., Chen L. J., Zhang X. M., Zhou J. Y., Cai M., Chen Y. X., Qi Q. L., Yang Z. D. Clinical characteristics and risk factors in pregnancy with severe community-acquired pneumonia // Chin. J. Obstet. Gynecol. 2018. Vol.53, Iss.12. P. 842–848. https://doi.org/10.3760/cma.j.issn.0529-567x.2018.12.008</mixed-citation><mixed-citation xml:lang="en">He Y. J., Mai C. Y., Chen L. J., Zhang X. M., Zhou J. Y., Cai M., Chen Y. X., Qi Q. L., Yang Z. D. Clinical characteristics and risk factors in pregnancy with severe community-acquired pneumonia // Chin. J. Obstet. Gynecol. 2018. Vol.53, Iss.12. P. 842–848. https://doi.org/10.3760/cma.j.issn.0529-567x.2018.12.008</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Dashraath P., Wong J. L. J., Lim M. X. K., Li S., Biswas A., Choolani M., Mattar C., Su L. L. Coronavirus disease 2019 (COVID-19) pandemic and pregnancy // Am. J. Obstet. Gynecol. 2020. Vol. 222, Iss. 6. P. 521–531. https://doi.org/10.1016/j.ajog.2020.03.021</mixed-citation><mixed-citation xml:lang="en">Dashraath P., Wong J. L. J., Lim M. X. K., Li S., Biswas A., Choolani M., Mattar C., Su L. L. Coronavirus disease 2019 (COVID-19) pandemic and pregnancy // Am. J. Obstet. Gynecol. 2020. Vol. 222, Iss. 6. P. 521–531. https://doi.org/10.1016/j.ajog.2020.03.021</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Hanada S., Pirzadeh M., Carver K. Y., Deng J. C. Respiratory Viral Infection-Induced Microbiome Alterations and Secondary Bacterial Pneumonia // Front. Immunol. 2018. Vol. 9. Article number: 2640. https://doi.org/10.3389/fimmu.2018.02640</mixed-citation><mixed-citation xml:lang="en">Hanada S., Pirzadeh M., Carver K. Y., Deng J. C. Respiratory Viral Infection-Induced Microbiome Alterations and Secondary Bacterial Pneumonia // Front. Immunol. 2018. Vol. 9. Article number: 2640. https://doi.org/10.3389/fimmu.2018.02640</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Andrievskaya I. A., Zhukovets I. V., Smirnova N. A., Demura O. V., Abuldinov A. S., Lyazgian K. S., Kolosov V. P. The clinical course of community-acquired pneumonia caused by SARS-COV-2 in pregnant women // Eur. Respir. J. 2021. Vol.58, Iss. 65 (Suppl.). PA287. https://doi.org/10.1183/13993003.congress-2021.PA287</mixed-citation><mixed-citation xml:lang="en">Andrievskaya I. A., Zhukovets I. V., Smirnova N. A., Demura O. V., Abuldinov A. S., Lyazgian K. S., Kolosov V. P. The clinical course of community-acquired pneumonia caused by SARS-COV-2 in pregnant women // Eur. Respir. J. 2021. Vol.58, Iss. 65 (Suppl.). PA287. https://doi.org/10.1183/13993003.congress-2021.PA287</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Gajbhiye R. K., Mahajan N. N., Kamath N., Bahirat S., Patokar G., Bhurke A. V., Modi D. N., Mahale S. D. Clinical presentations, pregnancy complications, and maternal outcomes in pregnant women with COVID-19 and tuberculosis: A retrospective cohort study // Int. J. Gynaecol. Obstet. 2021. Vol. 153, Iss. 1. P. 176–179. https://doi.org/10.1002/ijgo.13588</mixed-citation><mixed-citation xml:lang="en">Gajbhiye R. K., Mahajan N. N., Kamath N., Bahirat S., Patokar G., Bhurke A. V., Modi D. N., Mahale S. D. Clinical presentations, pregnancy complications, and maternal outcomes in pregnant women with COVID-19 and tuberculosis: A retrospective cohort study // Int. J. Gynaecol. Obstet. 2021. Vol. 153, Iss. 1. P. 176–179. https://doi.org/10.1002/ijgo.13588</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Wong Y. P., Khong T. Y., Tan G. C. The Effects of COVID-19 on Placenta and Pregnancy: What Do We Know So Far? // Diagnostics (Basel). 2021. Vol.11, Iss.1. Article number: 94. https://doi.org/10.3390/diagnostics11010094</mixed-citation><mixed-citation xml:lang="en">Wong Y. P., Khong T. Y., Tan G. C. The Effects of COVID-19 on Placenta and Pregnancy: What Do We Know So Far? // Diagnostics (Basel). 2021. Vol.11, Iss.1. Article number: 94. https://doi.org/10.3390/diagnostics11010094</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Di Girolamo R., Khalil A., Alameddine S., Di Girolamo R., Khalil A., Alameddine S., D'Angelo E., Galliani C., Matarrelli B., Buca D., Liberati M., Rizzo G., D'Antonio F. Placental histopathology after SARS-CoV-2 infection in pregnancy: a systematic review and meta-analysis // Am. J. Obstet. Gynecol. MFM. 2021. Vol. 3, Iss. 6. Article number: 100468. https://doi.org/10.1016/j.ajogmf.2021.100468</mixed-citation><mixed-citation xml:lang="en">Di Girolamo R., Khalil A., Alameddine S., Di Girolamo R., Khalil A., Alameddine S., D'Angelo E., Galliani C., Matarrelli B., Buca D., Liberati M., Rizzo G., D'Antonio F. Placental histopathology after SARS-CoV-2 infection in pregnancy: a systematic review and meta-analysis // Am. J. Obstet. Gynecol. MFM. 2021. Vol. 3, Iss. 6. Article number: 100468. https://doi.org/10.1016/j.ajogmf.2021.100468</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Suhren J. T., Meinardus A., Hussein K., Schaumann N. Meta-analysis on COVID-19-pregnancy-related placental pathologies shows no specific pattern // Placenta. 2022. Vol.117. P. 72–77. https://doi.org/10.1016/j.placenta.2021.10.010</mixed-citation><mixed-citation xml:lang="en">Suhren J. T., Meinardus A., Hussein K., Schaumann N. Meta-analysis on COVID-19-pregnancy-related placental pathologies shows no specific pattern // Placenta. 2022. Vol.117. P. 72–77. https://doi.org/10.1016/j.placenta.2021.10.010</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Andrievskaya I. A., Zhukovets I. V., Bardov V. S., Ishutina N. A., Dovzhikova I. V., Abuldinov A. S., Lyazgian K. S., Kolosov V. P. Oximetry and acid-base balance features in pregnant women with pneumonia caused by SARS-COV-2 // Eur. Respir. J. 2021. Vol. 58, Iss. 65 (Suppl.). PA444. https://doi.org/10.1183/13993003.congress-2021.PA444</mixed-citation><mixed-citation xml:lang="en">Andrievskaya I. A., Zhukovets I. V., Bardov V. S., Ishutina N. A., Dovzhikova I. V., Abuldinov A. S., Lyazgian K. S., Kolosov V. P. Oximetry and acid-base balance features in pregnant women with pneumonia caused by SARS-COV-2 // Eur. Respir. J. 2021. Vol. 58, Iss. 65 (Suppl.). PA444. https://doi.org/10.1183/13993003.congress-2021.PA444</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
