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A new coronavirus infection (COVID-19), which has spread widely in the human population in the past few years, is often complicated by a damage to the cardiovascular system, central nervous system, gastrointestinal tract, and respiratory system organs. The review describes the features of the clinical course and treatment of SARS-CoV-2 infection, which can lead to the development of cardiac complications both in the early and long-term periods. It is assumed that there are three main causes for the development of such complications (the affinity of the virus to endothelial proteins, the damage to blood vessels and the heart as a result of the immune response of the body and the toxic effects of drugs used to treat infection). Among the pathogenic mechanisms of the course of a new coronavirus infection that can lead to the development of cardiovascular complications, the following can be distinguished: manifestations of systemic vasculitis, coagulopathy, thrombosis, the phenomenon of “cytokine storm”, the direct cytotoxic damage to the myocardium, metabolic disorders, imbalance of the ionic composition of the blood, hypoxia and its consequences. The most common complications include myocarditis with arrhythmia (sinus tachycardia, bradycardia, atrial fibrillation and flutter, QTc prolongation, sudden cardiac death), cardiomyopathy (biventricular, isolated dysfunction of the right or left ventricle), cardiogenic shock, coagulopathy, thromboembolism (including strokes), vasculitis. Following recovery from COVID-19, many patients retain (or develop) the symptoms caused by the heart damage: a pain in the region of the heart, palpitations, appearance or aggravation of chronic heart failure, decompensation of hypertension, acute coronary syndrome. The main proposed directions for minimizing the risk of developing cardiac complications in COVID-19 patients include ECG monitoring (assessment of the QT interval, rhythm, conduction and repolarization), echocardiography in patients at risk, 24-hour ECG recording in patients who report palpitations. In addition, it is recommended to adjust the dosages of cardiotoxic drugs and to be cautious when prescribing anticoagulant therapy.

The article discusses of the role of modern educational technologies in pedagogical activity of the medical university department, perspectives of formation students' clinical thinking on the basis of competence-oriented approach. The authors analyze innovations accompanying the modern concept of modular education, and propose variants of modern technology usage as a part of education of future doctors. The authors present possibilities of context and problem education when teaching senior students. The article contains the information on the most advanced educational technologies imitating the future occupational activity of medical students and implemented at the department of internal diseases No. 1 of Kursk State Medical University. It is concluded that innovative educational technologies should be certainly used as they enable to organize an educational process so that it is possible to achieve the main purpose - formation of students' professional competences.

Abstract  Reaction of resorcinol with phosphorylated acetals or ethoxyvinylphosphonic acid esters in acidic media leads to calix[4]resorcinarenes, containing dialkoxyphosphoryl fragments at the lower rim of the molecule. When the alkyl substituent in alkoxy groups at phosphorus atom is not very long, a partial hydrolysis of the initially formed products takes place to give calixarenes with alkoxyhydroxyphosphoryl fragments. [ABSTRACT FROM AUTHOR]

Abstract  Aggregation in poly(ethylenimine)-calix[4]resorcinarene-water-DMF systems was studied by the methods of conductometry and dynamic light scattering. The sizes (radii) of the aggregates formed and the critical micelle concentrations were determined. The catalytic activity for these systems in the hydrolisys of phosphorus acid esters was shown. [ABSTRACT FROM AUTHOR]

Abstract  New derivatives of photochromic 2-aryl-1-(4-nitrophenyl)-1,1a-dihydroazireno[1,2-a]quinoxalines were synthesized by condensation of 4-methyl-and 4,5-dimethyl-1,2-phenylenediamine with 1,3-diaryl-2,3-dibromopropan-1-ones. The reactions of 4-methyl-1,2-phenylenediamine produce mixtures of regioisomers. The chemical properties of the reaction products were studied. The structure of one of the latter was established by X-ray diffraction. [ABSTRACT FROM AUTHOR]

Abstract  Acid-catalyzed reaction of 2,6-dihydroxypyridine hydrochloride with diethyl 2,2-diethoxyethylphosphonate or 2-ethoxyvinylphosphonyl dichloride in aqueous ethanol furnished a tetramer, phosphorus-containing analog of calix[4]resorcinarene with pyridine fragments in the molecule. [ABSTRACT FROM AUTHOR]

In experimental study confirmed the acceleration of wound healing and forming normotrophic scars tissue in laboratory animals using the transdermal administration of blood plasma 0 (I) by pulsed electrophoresis under the influence of an external magnetic field. It was established that the method proposed by the authors prevents the development of hypertrophic and keloid scars, and also stimulates tissue regeneration in the surgical area due to the activation of local regeneration processes.