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The article presents an overview of publications describing the mechanisms of the development of the pathological process in patients infected with SARS-CoV-2 coronavirus. The authors analysed publications showing that damage to the endothelium and endothelial glycocalyx is the main factor influencing the development of coronavirus COVID-19 infection. It is the endothelium inflammation caused by a virus that leads to the dysfunction of the vascular system and the development of coagulopathy. Using scanning electron microscopy and flow cytofluorimetry, we showed that patients with COVID-19 of moderate severity (CT2) had significant desquamation of endothelial cells (concentration of circulating endothelial cells (CEC) in blood is 300-400 cells/ml whereas the normal range is no more than 10 cells/ ml). Such desquamation should cause exposure of the pro-inflammatory and thrombogenic subendothelial matrix, which, as a results, leads to the development of thrombotic disorders of the circulatory system. Therefore, it is only natural to try to counteract disease progression by protecting the endothelial glycocalyx from damage. Sulodexide, a mixture of fast-moving heparin fraction (80%) and the glycocalyx element dermatan sulfate (20%) obtained from the mucous membrane of the small intestine of pigs, is very promising in this regard. This drug can significantly reduce the inflammatory process, protect the glycocalyx and endothelium from damage, resulting in lowering the degree of thrombus formation in patients with coronavirus COVID-19 infection, which relieves the course of the disease and improves its outcome. The experimental data presented in the review, although obtained in not large enough population of patients, allow us to consider sulodexide a promising drug that protects the endothelium and suppresses thrombosis in COVID-19.

Arterial thrombosis is a result of complex interaction between blood cells, soluble coagulation factors in plasma and vessel wall. Antiplatelet drugs do not always provide the necessary antithrombotic effect of sufficient strength, because their influence does not extend to all three factors involved in this process. Low doses of direct oral inhibitors of thrombin are able to potentiate antithrombotic effect of antiplatelet therapy. The combination of rivaroxaban in a dose of 2.5 mg and standard double antiplatelet therapy turned out to be the most promising for clinical use, since studies with dabigatran and apixaban at the II and III stages of the trials were found to be unsuccessful due to the unacceptably high frequency of bleeding. Studies of the combination of rivaroxaban at a dose of 2.5 mg and standard antiplatelet therapy conducted in previous years among patients with acute myocardial infarction showed a decrease in the frequency of complications of atherothrombosis associated with their ischemic nature, while at the same time there was a slight increase in hemorrhagic complications. In the COMPASS study the combination of rivaroxaban (2.5 mg) plus aspirin reduced the risk of the primary endpoint (myocardial infarction, ischemic stroke, cardiovascular death) more significantly than aspirin alone in patients with stable ischemic heart disease and ischemic brain disease. The pathophysiological rationales for the use of low doses of rivaroxaban when added to dual antiplatelet therapy are considered, and the significance of recent studies in patients with acute coronary syndrome, stable ischemic heart disease and in the prevention of ischemic stroke is discussed.

Aim. The aim of the study is to evaluate important additional cardiovascular (CV) risk factors of major adverse cardiac events (MACE) in patients with acute coronary syndrome (ACS) during the first 30 days after index event. Materials and methods. Overall 750 patients with ACS were enrolled in the single center prospective registry from 2012-2015yy. 569 patients received dual antiplatelet therapy and in 425 cases platelet function testing (PFT) were performed. Most of the patients characterized as high risk elderly patients with multiple CV risk factors and high comorbidity index. Results. At 30-day follow-up the mortality rate was 10,1%. Singlevariate analysis showed strong association between MACE and age, atrial fibrillation, stroke, chronic kidney disease, low ejection fraction, type 2 myocardial infarction (T2MI). Multivariate analysis showed that high-on-treatment platelet reactivity (PFT> 45%) with odds ratio 4.418 (p=0.0001), chronic kidney disease (OR 6.538 p=0.001) and T2MI (OR 1.925 p=0.0001) were significantly associated with adverse outcome. Conclusion. ACS registry showed high mortality level in real-life practice compared with randomized clinical trials due to the high prevalence of elderly patients with high comorbidity index. Patients with T2MI have significantly more severe prognosis and chronic kidney disease associated with increased MACE. PFT in this category of patients is reasonable for more accurate risk stratification.

Thrombocytopenia in blood count may be a reflex of haemostatic problems of different origin – from autoimmune disease to iatrogenic nature. Sometimes, thrombocytopenia may be revealed in patient with coronary heart disease before PCI procedure as well as some hours or days later. Dual antithrombotic therapy and thrombocytopenia have the same main side effect – bleeding. Etiology of disease and details of medical decision before percutаneous coronary intervention (PCI) in CHD patients are discussed.

The article is a critical review of the current literature on the issue of antithrombotic therapy in the acute phase of ischemic stroke. Despite the overall pathogenesis today, there are significant differences in the antithrombotic strategy used in acute coronary syndrome and ischemic stroke. Although reperfusion therapy is the most effective method of treatment of patients with thrombotic occlusion of the arteries of the heart or brain, only about 5% of neurological patients receive intravenous thrombolysis tissue plasminogen activator. In emergency neurology unused opportunities of platelet antiplatelet agents last generations, not appointed anticoagulants. The article examines issues of interdisciplinary collaboration and perspectives of modern antithrombotic strategies in neurology from the point of view of the neurologist, cardiologist and expert on antithrombotic therapy.

Use of antiplatelet therapy in the world indicates real difference in individual drug effect between patients, including the effect on prognosis. Problems of personification of individual approach, concerning antiplatelet therapy, are discussed.

Aim: to assess relation ofhigh functional activity ofplatelets to prognosis ofunfavorable cardiovascular events in patients with Acute Coronary Syndrome (ACS).Materials. The study was based on the data of a single center ACS registry conducted in the Central Clinical Hospital of the Presidential Affairs Department of Russian Federation. Of 529 included patients in 425 without contraindications to double antiplatelet therapy we carried out analysis of dependence of 30 days level of unfavorable events on parameters of functional activity of platelets.Results. High on-treatment platelet reactivity (HTPR) was found to be associated with 3.5 increase of mortality in the group of patients with high cardiovascular risk. Logistic model of prognosis of unfavorable events based on multifactorial analysis of data from patients with measured platelet aggregation included chronic kidney disease, type of myocardial infarction, and degree ofplatelet aggregation >45%. C -statistic was equal to 0.77. We also present in this paper discussion of problems related to studying approaches to individualization of anti-aggregation therapy in real clinical practice and problems of organization ofsimilar studies.Conclusion. The study showed that patients with ACS increased platelet aggregation, as well as chronic kidney disease and type 2 MI are associated with a 30 day prognosis of adverse events.

Optimal duration of dual antiplatelet therapy (DAPT) after stent implantation is uncertain. Some patients have an extended risk of thrombotic complications including that of very late stent thrombosis after cessation of recommended course of DAPT (6-12 months). On the other hand, there is a real risk of bleeding on DAPT. In this review, we present and discuss results of clinical trials of long-term DAPT and data of their meta-analyses. The review also contains consideration of some aspects of new AHA/ACC recommendations (2016) on duration of DAPT.

Dual antiplatelet therapy, including clopidogrel and aspirin, in a significant share of patients after acute coronary syndrome (ACS) is characterized by high level of platelet reactivity, which is associated with an increased incidence of cardiovascular events. Perhaps it will make reasonable the prescription of new antiplatelet drugs, particularly the combination of ticagrelor with aspirin.Aim. To assess the cost-effectiveness of VerifyNow P2Y12 platelet reactivity testing in patients after ACS.Material and methods. The analysis was performed for patients aged 55 years after ACS by modeling based on the results of the PLATO trial considering Russian epidemiological data. The time horizon of simulation was 5 years. It was assumed that the patients were receiving either generic clopidogrel or ticagrelor for 1 year, or before maintenance treatment VerifyNow P2Y12 assay had been performed, and the patients with platelet reactivity index >230 24-48 hours after ACS were receiving ticagrelor and the remaining patients - generic clopidogrel. It was expected that after 1 year the patients would discontinue treatment with clopidogrel or ticagrelor, and hereafter additional therapeutic effect of their use would be absent. The costs of antiplatelet agents in the reference case corresponded to the weighted average price of public procurement in 2013 in Russia. The costs of treatment of complications corresponded to the compulsory health insurance rates for St. Petersburg in 2014. The cost and life expectancy were discounted at 3.5% per year.Results. The platelet reactivity test and the prescription by its results of the combination of clopidogrel plus aspirin or ticagrelor plus aspirin can prevent 5 myocardial infarction and 6 deaths per 1000 patients additionally as compared with the prescription of clopidogrel plus aspirin combination to all patients. The costs for one additional year of life as compared with the combination of clopidogrel plus aspirin were 376.5 and 373.2 thousand rubles, respectively, the costs for one additional quality adjusted life year (QALY) were 433.8 and 509.8 thousand rubles, respectively. The total predictive value of costs per 1 patient with ACS using the test was 32% lower than in the routine use of ticagrelor in all patients.Conclusion. Assessment of platelets reactivity using VerifyNow P2Y12 assay in patients with ACS and modification of antithrombotic therapy in accordance with the received data can be considered as a cost-effective intervention which can reduce treatment costs as compared with the routine use of new antithrombotic drugs.