UDC

612.17

DOI

10.17238/issn2542-1298.2019.7.4.399

Authors

Ol’ga G. Litovchenko* ORCID: 0000-0002-8368-2590
Anna A. Ukhanova** ORCID: 0000-0002-9438-6316
*Surgut State University (Surgut, Khanty-Mansi Autonomous Okrug – Yugra, Russian Federation)
**Surgut City Clinical Hospital No. 1 (Surgut, Khanty-Mansi Autonomous Okrug – Yugra, Russian Federation)
Corresponding author: Anna Ukhanova, address: ul. Sibirskaya 14/2, Surgut, 628403, Khanty-Mansiyskiy avtonomnyy okrug – Yugra, Russian Fderation; e-mail: lege-artis73@mail.ru

Abstract

The age of 10 to 12 coincides with the start of the middle school, when children experience a lot of stress due to a wider education curriculum. Adverse climatic and geographical conditions increase the functional load on the child’s body. Considering that the cardiovascular system is one of the main indicators of adaptation processes in the body, it is important to study the functional state of the myocardium in 10–12-year-olds living in the unfavourable conditions of the Khanty-Mansi Autonomous Okrug – Yugra. Recent years have seen an increase in the prevalence of circulatory system diseases among children and adolescents living in Yugra. We analysed electrocardiograms of 273 healthy and relatively healthy children of both sexes aged 10–12 years that had been permanently living in the area for at least 10 years. The survey was conducted with an informed consent of the children’s legal guardians. The research revealed various functional disorders of the cardiovascular system in 51.74 % of the subjects. Sinus bradycardia in 10- and 12-year-old boys was significantly more frequent than in girls of the same age groups. Disorders of atrial conduction in 10-year-old children were significantly more frequent, compared to 12-year-olds. Girls showed signs of increased electrical activity of the right atrium and impaired atrioventricular conductivity more often than boys. The proportion of children with prolonged electrical systole tended to increase with age (from 10 to 12 years) both in boys and in girls.

Keywords

Khanty-Mansi Autonomous Okrug – Yugra, 10–12-year-old children, functional changes, cardiovascular system

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