[The impact of BMI on the course of the acute SARS-COV-2 infection and the risks that emerge during the first year after the hospital discharge. Subanalysis evidence of the AKTIV and AKTIV 2 registries].

Background: There is enough evidence of the negative impact of excess weight on the formation and progression of res piratory pathology. Given the continuing SARS-CoV-2 pandemic, it is relevant to determine the relationship between body mass index (BMI) and the clinical features of the novel coronavirus infection (NCI).

Aim: To study the effect of BMI on the course of the acute SARS-COV-2 infection and the post-covid period.

[ACTIV SARS-CoV-2 registry (Analysis of Chronic Non-infectious Diseases Dynamics After COVID-19 Infection in Adult Patients). Assessment of impact of combined original comorbid diseases in patients with COVID-19 on the prognosis].

Aim: Study the impact of various combinations of comorbid original diseases in patients infected with COVID-19 later on the disease progression and outcomes of the new coronavirus infection.

Materials And Methods: The ACTIV registry was created on the Eurasian Association of Therapists initiative. 5,808 patients have been included in the registry: men and women with COVID-19 treated at hospital or at home.

Analysis of influence of background therapy for comorbidities in the period before infection on the risk of the lethal COVID outcome. Data from the international ACTIV SARS-CoV-2 registry («Analysis of chronic non-infectious diseases dynamics after COVID-19 infection in adult patients SARS-CoV-2»).

Aim      To study the effect of regular drug therapy for cardiovascular and other diseases preceding the COVID-19 infection on severity and outcome of COVID-19 based on data of the ACTIVE (Analysis of dynamics of Comorbidities in paTIents who surVived SARS-CoV-2 infEction) registry.Material and methods  The ACTIVE registry was created at the initiative of the Eurasian Association of Therapists. The registry includes 5 808 male and female patients diagnosed with COVID-19 treated in a hospital or at home with a due protection of patients' privacy (data of nasal and throat smears; antibody titer; typical CT imaging features).

[Rapidly progressive glomerulonephritis in ANCA-associated vasculitis: a course, treatment efficacy, prognosis].

Aim: To study efficacy of ANCA-RPGN treatment with corticosteroids and cyclophosphamide or mycophenolic acid drugs.

Material And Methods: We treated 28 patients (17 males and 11 females aged 19-71 years) with morphologically verified ANCA-associated crescentic RPGN (crescentic median 79 (63:88)%. The patients received corticosteroids and cytostatics.

[Cytomegalovirus infection of allografted kidneys in children].

The study was based on 90 puncture bioptats of transplanted kidneys, received from 67 patients (33 males and 34 females) aged 8 to 18 or 14.1 +/- 4.7 years.

ElastoPHB membrane systems with immobilized bone marrow stromal cells optimize conditions for regeneration of damaged tissue.

The effects of autologous bone marrow stromal cells immobilized on ElastoPHB membranes on reparative processes were studied on a model of rat skeletal muscle injury. Bone marrow stromal cells inhibited substitute (sclerosing) regeneration and activated reparative (reconstructive) regeneration of tissues.

Immunohistochemical Investigation of the Heart Allograft Myocardium (1991-1998).

What is a contribution of the humoral (vascular) and mixed type of the rejection episodes to all the episodes of heart allograft rejection is not quite clear, though this factor is of considerable importance for the choice of the treatment methods. The hearts from recipients, as well as endomyocardial biopsies of the heart allografts and postmortem material were investigated with the aim to determine the immunopathological process. Overall, 420 samples from 80 patients were analyzed.

[Cardiomyocyte cytoskeleton in dilated cardiomyopathy and ischemic heart disease].

Summary. Vinculin, the protein of cardiomyocyte cytoskeleton in the myocardium of patients with a dilated cardiomyopathy and ischemic heart disease, was revealed by means of monoclonal antibodies and by a method of indirect immunofluorescence. Cytoskeleton of patients with dilated cardiomyopathy is disorganized, hypertrophic and contains greater amounts of vinculin than cytoskeleton of normal cardiomyocytes.

[Humoral immunopathologic changes in the myocardium after clinical allotransplantation of the heart].

Endomyocardial diagnostic biopsies, recipient heart removed at operation, endomyocardial biopsies of allotransplants and postmortem material were studied using immunofluorescence to specify immunopathological process and to detect humoral rejection. Altogether 306 samples from 55 patients were studied. In the early postoperative period (one year) 8 out of 18 patients with heart transplants repeatedly showed immunopathologic picture of acute humoral (vascular) rejection which was characterized by a widespread immunoglobulin G and complement fixation in the capillary walls accompanied by enhanced capillary permeability and fibrin deposition in intestitial tissue.

Evidence for antibody and immune-complex deposition in heart transplantation: a report of three cases.

Immunofluorescence microscopy of endomyocardial biopsy specimens from heart allograft recipients identified immunopathologic changes in three of 17 patients. These changes included immunoglobulin G and complement C3 deposition in tissue structures such as capillary endothelium and basal membranes, cardiomyocyte sarcolemma, and interstitial tissue. Moreover, the immunopathologic changes could be correlated with acute cellular rejection episodes evidenced by endomyocardial biopsy criteria.

[Immunopathologic study of the myocardium in dilated cardiomyopathy].

Myocardial tissues of patients with dilated cardiomyopathy were studied by immunofluorescence. While immunoglobulin A fixation was observed in myocardial capillary wall and cardiomyocyte sarcolemma in the majority of patients (11 of 12), immunoglobulin G and C3 complement component were a rare finding. In the vessel wall of heart allografts immunoglobulin A fixation occurred 3-6 days after transplantation.

[Changes in electric excitability and metabolism in the muscles of replanted extremity].

The authors have studied the dynamics of variation of redox enzymes in the muscles of replanted extremity in 40 adult dogs, which endured replantation of long-ischemized (18-21 degrees C, 4-6 h) extremities. It was discovered that during the postoperative period of observation (45 days) in the muscles of the replanted extremity are preserved obvious degenerative and dystrophic changes and decrease of metabolic and rehabilitation reaction. On the basis of the obtained data the authors employed the effective pathogenetic therapy.

[The morphofunctional characteristics of the skeletal muscles of the isolated extremity in heat-induced ischemia].

The morphological, histochemical, and morphometric studies of the skeletal muscle from a canine amputated limb failed to provide support for the views existing in the literature on various types of muscular fibres making up skeletal muscles. It was shown that in terms of the length of muscular fibers, there was only heterogeneity in activities displayed by the same enzymatic systems, which vanished with muscular abnormalities. Also, a significant difference was found in the responses of antagonistic muscles, which should be taken into account in the morphologic examination of biopsy specimens to establish whether the skeletal muscles are viable.

[Comparative study of electric excitability and metabolism in the assessment of vitality of the ischemized muscles of the amputated limb before replantation].

The authors have studied the dynamic changes of metabolic processes and the functional and the structural preservation of the muscles under the influence of heat ischemia (18-21 degrees C) on 29 amputated posterior extremities of 21 adult dogs of the both sexes. It has been shown that direct muscle excitability disappears 5 hours after the influence of heat ischemia, although after 6 hours of observation the values of the metabolic processes in the muscles made 35-40% of the basic level. The character of the changes in the muscle excitability gives an idea of the duration of action of heat ischemia and the preservation of vitality of the amputated extremity only up to the moment of its complete disappearance.