Changes in the end part of the QRS complex and the ST-T segment in patients with coronavirus infection

This article is devoted to the patterns of changes in the QRS complex and the ST-T segment in patients with a new coronavirus infection. The article presents the results of a comparison of electrocardiogram data in 70 patients with COVID-19 who were treated in 1st Department of Internal Medicine Postgraduate Training from April to July 2020. Each patient had at least two electrocardiograms taken (at the beginning and at the end of the disease). In the course of the work, a new method for measuring the area of the teeth P, T, QRS complex and ST-T segment was developed and described using the dynamic mathematical program GeoGebra Classic 6.0 by correlating the millimeter grids of the electrocardiogram and the program and further constructing an irregular shape taking into account the polarity of the teeth and segments. According to the study, the sum of the ST-T segment areas in all 12 leads is statistically significantly greater at the end of the disease in individuals over 30 years old. It is also significantly higher in the right thoracic leads (V1-V2) in for all ages. Probably, these changes are associated with the severity of the underlying disease and, consequently, with the overload of the right parts of the heart.