Left ventricle mechanics in the first third sistole in healthy children born full-term

The aim of the study is to assess the left ventricle rotation and twist in the first third of the systole in healthy children and adolescents born full-term. Material and Methods. The analysis was carried out in 108 healthy children aged 5 months to 18 years, born full-term, who belonged to the health groups I-II. Prior to inclusion in the study, nobody has suffered and acute respiratory viral infections in the past 6 months Depending on the age, children and adolescents were divided into the following subgroups: from 5 months to 3 years, 3 to 6 years, 6 to 11 years and over 11 years. On the basis of the sex ratio, the distinguished sub-groups of children did not differ among themselves. Left ventricle rotation is assessed at the level of basal segments, papillary muscles, apex segments and left ventricle twisting in the first third of the systole and towards the end of the systole. Results. Left ventricle rotation in the first third of the systole at the level of the basal segments was recorded in 75.9% of healthy children who had type I of left ventricle twist and in 29.4% of healthy children with the second type of left ventricle twist. Left ventricle rotation at the level of the apical segments was revealed - in 20.37% of children with type I left ventricle twist. The phenomenon of «lack of left ventricle twist in the first third of the systole» was found in 12.96% of healthy children and adolescents born full-term at the age before 4 years. The presence of this phenomenon did not depend on the type of left ventricle twist at the end of systole, the left ventricle sphericity index at the end of systole and diastole of left ventricle. In the phenomenon of «lack of left ventricle twist in the first third of the systole», the time to the peak rate of left ventricle twist rate in systole is less than 85 ms.