MULTISYSTEM INFLAMMATORY SYNDROME IN CHILDREN ASSOCIATED WITH COVID-19 AND COMPLICATED BY VENOUS AND ARTERIAL THROMBOSES: A SERIES OF CLINICAL CASES
Authors:   Irkutsk State Medical Academy of Postgraduate Education, Branch of the Russian Medical Academy for Continuous Professional Education, Irkutsk, Russia, Bregel L.V. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Efremova O.S. ,   Irkutsk State Medical Academy of Postgraduate Education, Branch of the Russian Medical Academy for Continuous Professional Education, Irkutsk, Russia,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Kostik M.M. ,   Saint Petersburg State Pediatric Medical University, Saint Petersburg, Russia, Rudenko N.Yu. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Korinets T.S. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Drantusova N.S. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Barakin A.O. ,   Irkutsk State Medical Academy of Postgraduate Education, Branch of the Russian Medical Academy for Continuous Professional Education, Irkutsk, Russia,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Kozlov Yu.A. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Albot V.V. ,   Irkutsk State Medical Academy of Postgraduate Education, Branch of the Russian Medical Academy for Continuous Professional Education, Irkutsk, Russia,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Pak Ki O ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Knyazeva N.А. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Tolmacheva O.P. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Ovanesyan S.V. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Belousova L.V. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Balakirev E.A. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Byrgazov A.A. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Matyunova A.E. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Poloyan S.S. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia, Kondratyeva T.G. ,   Irkutsk Regional Children's Clinical Hospital, Irkutsk, Russia
Published: June 2024

SARS-CoV-2 causative agent may result in adulthood in hyperinflammatory syndrome and cytokine storm in some patients leading to the microvascular bed thromboses as well as those of large venous and arterial vessels. In the COVID-19 critical form, multisystem inflammatory syndrome in children (MIS-C), thromboses are less common. Authors represent a series of 8 patients’ cases with both thromboses and MIS-C associated with COVID-19 of different localization hospitalized in Nov. 2020-Nov. 2022 aged 4 months to 17 years old (Me 7.5 y/o): 4 aged 4 m/o to 5 y/o and 4 aged 8 to 17 y/o; 6 boys/2 girls. The incidence of thromboses was 13.3% (8/60 pediatric patients with MIS-C); venous thrombosis occurred in 6 (10% of 60), arterial thrombosis in 4 (6.6%), large cerebral vessels thrombosis coupled with the development of bilateral stroke occurred in 2 (3.3%), secondary thrombotic microangiopathy (TMA) in 3 (5%), distal gangrene in a single case (1.7%) and the cerebral venous sinus thrombosis in a single case (1.7%) as well. Treatment was carried out with anticoagulants, aspirin, immunomodulators (intravenous immunoglobulin, glucocorticosteroids, genetically engineered biological drugs). One of 8 patients with thromboses had died from pulmonary embolism (1.7% among all 60 patients with MIS-C), 6 of the 7 survivors continue to be followed up without complications and a single patient continues to have residual severe neurological deficits. Conclusion: venous thrombosis, secondary TMA and large cerebral arteries thrombosis predominated. Treatment of thrombosis with unfractionated heparin intravenously by continuous infusion with a transition to low molecular weight heparins against the background of pathogenetic therapy for MIS-C with immunomodulators was effective in most patients. Acetylsalicylic acid was used in 3 (with coronary dilatation and/or absence of severe thrombocytopenia). Risk factors for thromboses were male gender, severe congenital underlying diseases.