Coagulopathy in COVID-19 patients is presumably based on systemic hypercoagulation with the inflammatory response. As a result of endothelial dysfunction, tissue factor and von Willebrand factor (vWF) are released into the blood stream, which leads to prothrombinase activation. The vWF/ADAMTS-13 ratio can be used for monitoring the severity of the disease. This observational prospective study included 141 patients with COVID-19. In patients with mild COVID-19 (group 1), the assessment was performed on the 3rd–7th day of illness (point 1) and 14–28 days after recovery (point 2). In patients with moderate (groups 2) and severe (group 3) COVID-19, the assessment was performed during hospitalization (point 1) and after 14 days (point 2). The vWF:RCo/ADAMTS-13:activity (point 1), vWF/ADAMTS-13 (point 2) and vWF:RCo/ADAMTS-13:activity (point 2) ratios were significantly higher in patients with moderate and severe COVID-19. Moreover, in these patients, both ratios increased after recovery (point 2), which is a negative prognostic factor of thrombotic complications. Thus, COVID-19 is characterized by a decrease in the concentration and activity of ADAMTS-13 metalloproteinase, especially in patients with the severe form of COVID-19. A decrease in ADAMTS-13 activity results in an increase in vWF concentration and activity so the ratio of vWF to ADAMTS-13 changes significantly.

Background: At the present moment, an urgent and unresolved problem is the search for a method to diagnose disorders of the hemostasis system in patients with the new coronavirus infection. The integral tests, in particular, the thrombodynamics test, will presumably make it possible to monitor changes in blood clotting, and predict the course of the disease in patients with COVID-19. Aims: To comparatively assess the plasma hemostasis parameters and results of the thrombodynamics test in patients with COVID-19 viral infection of different severity. Methods: The study included 96 patients with a confirmed diagnosis of COVID-19, admitted to a hospital for infectious diseases on the base of the V.I. Kulakov National Medical Research Center for Obstetrics, Gynecology, and Perinatology in the period from April 23, 2020, to June 20, 2020, and discharged at the end of treatment. SARS-CoV-2 was identified by PCR. The patients were stratified by the severity into 3 groups: mild course (n=25), moderate course (n=54), severe course (n=17). The diagnostics and treatment of patients were carried out in accordance with the Temporary Methodological Recommendations of the Ministry of Health of the Russian Federation for the prevention, diagnosis and treatment of the new coronavirus infection, versions 5, 6, 7. In the course of the treatment, the patients were assessed for APTT, prothrombin %, prothrombin time (PT) and thrombin time, fibrinogen, D-dimer, platelet count, and the thrombodynamic test parameters (V/Vi/Vst, Tlag, Cs, D). Results: Significant differences were observed in the thrombin time, D-dimer, platelet count, and the thrombodynamic parameters of V/Vst, Cs, and D taken before admission and a week after admission. We found a relationship between the parameters of hemostasis (fibrinogen concentration, PT, prothrombin %, APTT, Tlag, D) and the duration of hospital stay. There was a positive relationship between the content of fibrinogen and D (r=0.6307, p 0.0001) and a strong positive relationship between PT and Tlag (r=0.7499, p 0.0001). Conclusions: The thrombodynamics test can be recommended as a potential tool for a personalized approach to monitoring the hemostasis system and treating patients with COVID-19.

The aim of the work was to determine frequency of lupus anticoagulant (LA) detection in patients at various degrees of COVID-19 severity as well as duration of LA circulation after the infectious disease. The study included 103 patients with COVID-19. The patients were observed during the hospital care and in ambulance, if required. The patients were admitted to the departments of infectious diseases arranged at the V.I.Kulakov National Medical Research Center for Obstetrics, Gynecology, and F.I. Inozemtsev City Clinical Hospital. Treatment schedules and stratification of the patients by clinical severity was carried out in accordance with Interim Guidelines issued by the Ministry of Health of the Russian Federation for the prevention, diagnosis and treatment of new coronavirus infection (version 9). The following groups were formed: mild (n = 27), moderate (n = 55) and severe (n = 20). The patients were tested for LA positivity in the course of disease: on the day of starting medical care (with outpatient observation), or on the day of hospitalization; repeated tests were made before discharge (inpatients), and later, 1-2 months and 7 months after recovery. Lupus anticoagulant was determined by two independent tests (dRVVT and SCT), i.e., as a screening test and a confirmation test. At initial examination, LA was found in 50 patients (49%). The effect of LA in 98% of cases was observed with dRVVT test, as an increase of normalized ratio (NR). The maximum median value of NR was 1.54 (0.97: 2.1) was revealed in patients with severe course of COVID-19 (p 0.0001) compared with other groups and correlated with severity of the infectious process (r = 0.491, p 0.0001). In mild cases of COVID-19, LA was detected less often (4 cases, 14.8%) than in moderate severity cases (27, 49.1%), and severe patients (19, 95%) (p 0.05). Re-examinations of the patients before discharge from the hospital and 1-2 months later revealed high frequency of LA (p 0.05). However, no LA-positive test was found 7 months after discharge. In patients with COVID-19, high frequency of circulating LA was registered, depending on severity of the infectious process. In addition, we have first shown that persistence of the circulating LA over post-infectious period does not exceed 7 months.

Выбор энтерального питания для доношенных новорожденных в условиях отсроченного лактогенеза с позиций понимания функциональных особенностей желудочно