Abstract
This study provides examination of cardiovascular system of children who live in Ust-Kamenogorsk, mainly in its environmentally polluted areas as industrial zones and Ulbinsk region. The work focused on studying the age and gender characteristics of the cardio vascular system in children living in environmentally unfavorable conditions of Ust-Kamenogorsk. The study highlighted the role of contamination into the development of many diseases that affect cardiovascular system of children in various age categories. The features of cardiorespiratory system were evaluated by methods of pneumotachometry, variational pulsometry, electrocardiography, Holter daily monitoring of electrocardiography. There was detected a gradual increase in sympathetic regulation of heart rate in boys and humoral regulation in girls aged 9-12 years. It was shown that the resistance of children’s organism to the harmful environmental effects depend on their constitutional features. The increased level of stress also affects the well-being of children, as caused by the unfavourable conditions. The method of daily ECG monitoring revealed an increase in the frequency of elevation ST segment, to a lesser extent its depression, so the incidence of bradycardia is more often than tachycardia.