The presence of coagulopathy as part of the systemic inflammatory response syndrome is a characteristicfeature of severe coronavirus disease 2019 (COVID-19). Hematological changes (increased D-dimer [DD],prolonged activated partial thromboplastin clotting time [APTT] and prothrombin time [PT], highfibrinogen levels) have been observed in hospitalized patients with COVID-19, which characterizethe risk of thrombotic events. Against the background of COVID-19 there is endothelial dysfunction,hypoxia and pulmonary congestion, mediated by thrombosis and microvascular occlusion. Up to71.4% of patients who died from COVID-19 had disseminated intravascular coagulation syndrome,compared with only 0.6% of survivors. The main manifestation of COVID-19-associated coagulopathyis a significant increase in DD without a decrease in platelet count or prolongation of APTT and PT,indicating increased thrombin formation and the development of local fibrinolysis. An increase in DDlevels of more than 3–4 times was associated with higher in-hospital mortality. Therefore, COVID-19requires assessment of the severity of the disease for further tactics of thromboprophylaxis. The need forcontinued thromboprophylaxis, or therapeutic anticoagulation, in patients after inpatient treatment fortwo weeks using imaging techniques to assess of thrombosis assessment.

УДК 616.13-002-036-053.2-07:616.155.02

Kawasaki disease (KD) is an acute systemic vasculitis that is the most common cause of acquired heart disease in children under 5 years of age with hyperthermia. Diagnosis of KD is a clinical challenge, given the wide range of clinical manifestations and similarities with many viral and bacterial diseases. Purpose - to describe a clinical case of refractory КD in a three-month-old girl with an emphasis on the importance of echocardiography and coronary angiography for the final verification of the disease, urgent initiation of treatment with minimal suspicion of КD. Clinical case. The article reports on a three-month-old patient with a difficult diagnosis of refractory form of КD. The disease debuted with hyperthermia, enterocolitis, obstructive bronchitis, and hepatoliver syndrome. The manifestations of skin exanthema were initially considered as an allergic dermatitis to the use of a cephalosporin antibiotic. Multisystemic inflammatory syndrome associated with SARS-CoV-2 infection was suspected. After the use of immunosuppressive therapy with mega-doses of dexamethasone and intravenous human immunoglobulin 2 g/kg/day for 3 days, clinical improvement was achieved. Subsequently, the haemogram showed an increase in neutrophilic hyperleukocytosis to the appearance of blast cells, hyperthrombocytosis and severe anaemia. A differentiation was made between a leukemic reaction, the debut of myeloproliferative disease, juvenile myelomonocytic leukaemia. Against the background of a rapid decrease in the number of leukocytes, the girl developed hyperthermia, migratory intermittent maculopapular rash, and foots edema. Laboratory findings included thrombocytosis and an increase in acute-phase parameters. Echocardiography revealed left ventricular dilation, a small amount of excess fluid in the pericardium, dilatation of the left coronary artery evenly to the bifurcation. Computed tomography revealed giant coronary artery aneurysms, which gave grounds to diagnose KD