The objective of our study was to assess the impact of regional living conditions on the Russian population’s mental health. For the analysis, we used data from the cross-sectional stage of a 2013–2014 study, “Epidemiology of Cardiovascular Diseases in the Regions of the Russian Federation (ESSE-RF)”. The final sample included 18,021 men and women 25–64 years of age from 11 regions of Russia. Using principal component analysis, we performed an integral simultaneous assessment of stress, anxiety, and depression. To describe the regional living conditions, we utilized five regional indices, which were computed from publicly available data of the Federal State Statistics Service of Russia. Overall, mental health indicators were improved, on the one hand, with the deterioration of social conditions and an aggravation of the demographic depression in the region, but on the other hand, they were improved with an increase in economic and industrial development, along with economic inequality among the population. In addition, the impact of regional living conditions on mental health increased with a higher individual wealth. The obtained results provided new fundamental knowledge on the impact of the living environment on health, using the case study of the Russian population, which has been little studied in this regard.

Relevance. Sepsis is a life-threatening organ dysfunction caused by dysregulation of the body's response to infection. It is estimated that the annual number of sepsis cases worldwide could be 48 million. An increase in the role of nosocomial infections, an increase in concomitant pathology, and the rapid development of complications lead to negative dynamics in the sepsis incidence and mortality.Aims. Review of the epidemiological characteristics of sepsis in the world and the Russian Federation, study of the etiology, risk factors, complications and prevention of sepsis.Conclusions. The data obtained indicate that sepsis remains an unsolved public health problem in many countries of the world. According to modern data, the annual sepsis (ICD-10: A00-B99, A30-A49, A41) incidence among the adult population in accordance with «Sepsis-3» is 838 per 100 ths. So, assessing the incidence of sepsis and mortality from it, we can identify the negative dynamics of recent years, which is typical for the United States of America, Europe and Asia. For example, the incidence of all forms of sepsis ranges from 25 per 100 ths in Italy (2006) to 883 per 100 ths in Sweden (2019). Moreover, every fourth case of sepsis (24.4%) in the world was acquired during a stay in an ICU. Hospital mortality from all forms of sepsis in various countries ranged from 17.5% in Spain (2013) to 46.3% as a whole and 64.5% with admission to ICU in Brazil (2006–2015). Unfortunately, in the Russian Federation, there are no large studies aimed at assessing sepsis incidence and mortality. According to the results of studies conducted on the basis of ICU in hospitals of St. Petersburg, sepsis incidence was 35 per 100 ICU patients (2006–2007) and 15 per 100 ICU patients (2015). When studying the epidemiological features of sepsis, the following difficulties can be identified: changing the criteria for diagnosing sepsis, comparing data on sepsis, severe sepsis and septic shock, evaluating data on community-acquired and in-hospital sepsis. So, sepsis prevention plays an important role in the public health of many countries. Major preventive strategies to reduce sepsis incidence include raising awareness of sepsis; identification of persons at risk; early diagnosis of sepsis; treatment of comorbid pathology leading to the potential development of sepsis and progression of its complications. The epidemiological status continues to deteriorate due to the growth of antibioticresistant strains, an increase in the proportion of fungal agents, late antibiotic therapy, an unfavorable comorbid status and other factors. Early diagnosis and timely clinical management of sepsis play the main role in the improvement in the quality of life. For example, treatment of chronic infectious diseases, minimization of manageable risk factors, and development of population screening programs will further reduce sepsis incidence and mortality.

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Based on the III International Consensus on the definition of Sepsis and Septic Shock (Sepsis-3), the modern definition of septic shock was proposed: “Septic shock is a type of sepsis that is accompanied by severe hemodynamic, metabolic and cellular disorders, and these disorders are associated with a higher risk fatal outcome”. Despite the classic idea of septic shock development (proinflammatory, immunosuppressive phases and, finally, multiple organ failure with distinct shock organs), the theory of activation of the caspase, endocannabioid system and system of protein of programmed death-1 in evolving septic shock are promising approaches to development of new diagnostic and therapeutic methods. Lymphopenia is already observed at an early stage of septic shock, which further leads to deep immunosuppression. Previous experimental studies have revealed some treatment methods to reduce the pro-inflammatory stage, which, however, did not show desired results in clinics. Now it is necessary to look for ways to inhibit apoptosis, depletion of lymphocytes, macrophages and other immune cells in the course of septic shock. It is known that caspases mediate innate detection of pathogenic microorganisms, cause pyroptosis, activation of monocytes. It has been proven that inhibition of caspase-8, caspase-11 leads to decreased monocyte functioning and cytokine release, which plays an important role in immunopathogenesis of septic shock. Associations of PD-1 and PD-2 expression on CD4+  lymphocytes and monocytes are also shown to be connected with immune dysfunctions, decrease in lymphocyte proliferation, and increased interleukin-10 concentration. Stimulation of the cannabinoid receptors is able to reduce inflammation by inhibiting cytopathic and immunosuppressive effects of pathogens. It has been shown that classic septic shock biomarkers (pro-inflammatory, anti-inflammatory cytokines; procalcitonin, lactate, etc.) do not have predictive power in relation to the outcome of the disease. Circulating and citrullated histones, determined by mass spectrometry, may serve as potential diagnostic markers of septic shock, but they require further study. Use of oxidized phospholipid oxPAPC (Oxidized 1-palmitoyl-2-arachidonoyl-snglycero-3-phosphocholine), hydrogen sulfide and Fasciola hepatica fatty acid binding proteins (hepatic fluke) prevents oxidative stress, synthesis of pro-inflammatory cytokines and provides maturation of macrophages and dendritic cells. Further study of immunological reactions during septic shock is of great importance for substantiation of new approaches to the diagnostics and therapy of septic shock.