Vol 25, No 7 (2018)

Mercury is capable of atmospheric transfer by large distances, offers resistance to the environment, is able to bioaccumulation in ecosystems and leads to significant negative consequences for the public health. Aim: to study the mercury content in the hair of rural residents of the Yamalo-Nenets Autonomous District and assess the population health risks. Methods: A single-step epidemiological study was conducted with the formation of a representative selection of rural residents in the Yamal-Nenets Autonomous District. The hair samples were taken from the occipital part of the head using a standard WHO technique. Chemicoanalytical study of samples wwas carried out in a licensed laboratory using mass-spectrographic method with inductively coupled argon plasma. The statistical analysis was performed using the Statistica v.8.0 program. Differences were assessed as statistically significant at p < 0.05. Results: Mercury concentration in the hair of the inhabitants living in the rural settlements varied from 0.204gg/g to 9.99 gg/g and those leading the traditional (nomadic) lifestyle varied from 0.303 gg/g to 5.21 gg/g. Increased risk to public health of Tazovsky settlement was detected in 48.8 % of cases, for residents who led the traditional way of life in Gydansky, Antipayutinskaya and Nakhodka tundra - 86.6 %, Harsaim settlement - 77.3 %. Absolute average values of mercury content in hair of the aboriginal population were 2.6 times higher than in the migrants. Conclusions: It is necessary to strengthen control over mercury content in natural environments and its accumulation in food chains and to carry out measures to reduce the population health risk.

Aim: identification of gender differences in the parameters of psychomotor reactions among cadets of the Ministry of Internal Affairs university. Summary: two methods were used for psychomotor sphere evaluation. The "Search" method combines a number of tests to estimate the speed of visual recognition of a moving object among a set of stationary objects similar to it. The "Coordination" method is used to evaluate the psychomotor factor of limb movements coordination and bilateral asymmetry of motor functions. The essence of the tests is the consecutive performance of the given reactions (pressing the right and left buttons, the foot pedal), each of which is linked to a certain signal (red, yellow, green). Results: An analysis of the results obtained showed a low efficiency of the visual detection of a moving object in the group as a whole. In general, the effectiveness of movement's coordination among boys corresponded to a high level. Differentiated analysis of level formation of professionally important qualities (PIQ) showed statistically significant gender differences in the efficacy parameter in the group with a medium level PIQ (р = 0,031), on the value of latency (р = 0,014) and stability (р = 0,044) in the group with a level lower than the medium. Assessment of psychomotor parameters of movement's coordination revealed a statistically significant difference in the overall effectiveness of the assignment (р = 0,004). Correlation analysis between the levels of development of PIQ and the parameters of visual-motor reactions have demonstrated the direct dependence of the level of coordination from the male sex of the subject (r = 0,50, р = 0,050), the efficiency of detecting a moving object and reverse dependent on the efficiency of foot reactions. Conclusions: А more effective implementation of sensorimotor reactions (SMR) complex than the simple SMR may point to the complexity and novelty of the presented test modality in a simple SMR, which requires a longer perceptual process time. The obtained gender differences may be associated with a higher levels of activation of the CNS in young men, differences in the emotional sphere of boys and girls by level of anxiety.

Aim: Determination of quantitative characteristics of temporal variations in ECG dispersion mapping (DM ECG) and heart rate variability (HRV) in Caucasians, born in Magadan Region in the 1st and 2nd generation, with the initial vagotonic type of autonomic regulation. Methods: The ratio of HRV parameters to heart ECG was analyzed among male volunteers aged 15-17, whose initial autonomic nervous system (ANS) activity level was characterized by vagotonic orientation (68 people out of 160): moderate - group 1 (41 people) and pronounced - group 2 (27 people), respectively. Results: When comparing the HRV parameters with the averaged values of the DM for the "Rhythm" characteristic, it turned out that in group 2 the range of values corresponded to 19-40 % (the norm up to 20 %) significantly exceeding the values characteristic for group 1 (10-23 %). The "Myocardium" integral indicator values in the two groups were close to the upper limit of the norm (15-17 %). The greatest number of non-zero values indicating the reference pathology similarities is observed in G1-G2 and G9. More than half of the volunteers in group 2 had G1-G2 characteristics indicating depolarization deviations in the atria caused by different localization of the potentials. The G9 indicator deviations with a value fluctuations ranging up to 5 conv. units were observed more often. The non-expressed deviations of dispersion characteristics in terms of the G3-G8 indices toward the boundary states of the norm were single. Conclusions: In groups with a moderate and elevated level of autonomic regulatory contour influence on the heart rhythm, there are differences in all the analyzed cardiorhythm parameters. With pronounced vagotonic orientation, cardiorhythm deviations, similarly with the reference pathology in the processes of atrial depolarization caused by different localization of the potentials (G1-G2), as well as in the ventricle depolarization initial front velocity characteristics enhancements are noted more often (G9).

The intussusception (IS) often is followed mesadenitis, however a question, whether it is the reason or a consequence of formation of the intussusception, remains disputable. Aim: To estimate a role of the mesadenitis in formation of the intussusception in children. Methods: Retrospective study of results of treatment of all treated children with intussusception (n = 270) in the Arkhangelsk regional children's hospital in 1981-2012 is executed. Estimated the frequency of the background infectious and inflammatory diseases capable to be the cause for the mesadenitis. Studied the frequency of identification and the sizes of lymph nodes (LN) in structure of the intussusception according to ultrasonography and hydrocolonic sonography (HS) depending on duration of symptoms of IS. Results: It was verified that symptoms of diseases which are followed mesadenitis initially met in 66 % of patients. Thus according to ultrasonography in structure of intussusceptum LN in 82 % of patients were defined. It wasn't revealed statistically significant interrelation between time from the moment of the beginning of an IS, length of the LN (x2(2) = 0,11; р = 0,948) and cross size (x2(2) = 0,05; р = 0,975). The largest LN was localized in the head of the intussusceptum. Reduction by method of HS allowed to visualize LN in structure of the intussusceptum, its efficiency made 95,6-100 %. Conclusion: Mesadenitis is the most frequent reason of the intussusception in small children. The understanding of the role of mesadenitis in formation of the IS promotes more effective conservative treatment.