Vol 24, No 8 (2017)

The development of solid-state electronics technology has led to the technically advanced electrical installation emergence, in particular Digital transformer substations (DTS) 10 (20)/0,4 kV. However, due to the uniqueness and novelty of the development the adverse health effects of the digital transformer substation are currently absent. The article presents the theoretical studies results of negative effects of the industrial frequency of electromagnetic fields (EMF) on personnel health operating the high-voltage equipment DTS. EMF performance evaluation (intensity of electric and magnetic fields, body current capacitor) during DTS operation in various installed capacity 10/0,4 kV and 20/0.4 kV has been done. The obtained results are compared to EMF level being created by high-voltage equipment of existing transformer substations and checked for compliance with current health standards. The characteristic curve of intensity of electric and magnetic fields, body current capacitor at nominal rating power, voltage and DTS electrical equipment are presented. It is shown that use of DTS in distribution networks scarcely has negative effect on the operating personnel health.

The examinees were 102 male habitants of Anadyr and Chukotsky Autonomous District, 17-19 aged, Europeans (Caucasians) and Aborigines. Functional reserves of autonomic regulation were studied and influence of its changes on cardiohemodynamics at active orthostatic test in different ethnic groups with similar types of original autonomic nervous system. The findings testified that, irrespective of ethnic origin or autonomic tonus similar responses to active orthostatic test were observed focused on weakening parasympathetic section of autonomic nervous system and strengthening sympathetic one. However, fundamental difference was registered in normotonic subjects and occurred in low frequency component of the heart rate power (LF). Cardiac hemodynamic analysis showed that, Europeans (Caucasians) and Aborigines who had different types of autonomic regulation, however, demonstrated their functional indices to largely coincide with each others at either baseline or at active orthostatic test. Some revealed differences were caused by types of autonomic regulation rather than by ethnic origin.

Chronic occlusive disease of lower limb arteries is a widespread disease of the blood vessels, where due to arteriostenosis there appears arterial misperfusion in the limb. According to the data, nowadays from 2 to 15 % of the adult population suffer from this disease. The literature review shows the relevance of studying the problem of peripheral arteries occlusive diseases (PAD) in the extreme environmental conditions of the Northern latitudes. The analysis conducted by scientists of Surgut city showed that the most important etiological factors resulting in PAD are atherosclerosis (54.5 %) and occlusive tromboangitis (45.3%). Occlusive diseases of the vascular system have multisegmental nature and appear at a young age and often have malignancy flow. The development of atherosclerotic process in its classic version starts at the age of 40-50 years, more often with sectoral lesions in the iliac segment. Occlusive process, once appeared, has no tendency to reverse development, and the outcome of this process (40 % of patients with PAD) is a disability or limb amputation. The study results showed that in young people living in KHMAO-Yugra, endothelial function was characterized by more evident disorders compared to normal rates; the severity of dysfunction was higher than in healthy individuals with risk factors for cardiovascular diseases. The biological age of the subjects met people over 40, and in men, the processes of biological aging was characterized by greater severity.

Objective: to study changes in the course of the duodenal ulcer in patients residing in the European North, using melatonin as an addition to standard antiulcer therapy. Materials and methods: the study involved 80 patients with uncomplicated active duodenal ulcer. Patients were divided into 2 groups: Group I (test, 40 patients), received a triple regimen (omeprazole, clarithromycin, amoxicillin) and melatonin as an addition; Group II (control, 40 patients) received only a triple regimen. Taking into account the peculiarities of photoperiodism in the region subgroups A and B were marked in the 1st Group, subgroups C and D - in the 2nd group (A and C- received treatment from March to August; and B and D-from September to February). Results: Before treatment in all groups and subgroups patients complained of epigastric burning, ulcerative pain and sleep disturbance. Complaints disappeared faster in the test group than in the control; in the subgroup A and B compared to subgroups C and D respectively. Study of time limits of patients' physical status recovery did not reveal statistically significant differences between test and control groups, however, faster recovery was observed in subgroup A compared to sub-group C. Cicatrization according EGD on the 14 day of the therapy took place in 100 % cases in the study group and the subgroups A and B, whereas in the control group and in the sub-groups C and D - 60, 80 and 40 %, respectively. Conclusions: antiulcer therapy in combination with melatonin is more effective, especially when administered in a period of growth and maximum day light duration.