Abstract
The aim of the study is to determine the features of time and amplitude indicators of the electrocardiogram (ECG) in 7 years olds, born and living in the Northern region. Materials and methods of research: 252 7-year-old children from various educational institutions of Surgut were examined. Time and amplitude indicators of the ECG, the position of the electrical axis of the heart (EAH) were determined in 12 standard leads, the comparative analysis of the ECG indicators was carried out by gender identity. Results: all study participants had a sinus heart rate. Dysfunctions of cardiac automatism in the form of sinus tachycardia and bradycardia were found in 52,8% of 7-year-old children living in the Middle Ob river basin. A deviation of the QRS wave for more than 90 ms in 28,5% of the examined children was revealed.
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