Research relevance: in recent decades, there has been a significant increase in interest in cardiomyopathies, mainly of the heart muscle, often characterized by an unclear etiology, chronic progressive course and, ultimately, cardiomegaly, progressive heart failure, arrhythmic, thromboembolic syndromes, often ending in sudden cardiac death. Materials and research methods: presentation of results after statistical studies on the clinic, diagnostics of a violation of the conducting system by cardiomyopathy in children aged 1 to 16 years, who underwent inpatient treatment in the cardioreumatology department of the Osh medical children’s clinical hospital from 2016 to 2020, according to clinical material on 67 children with dilated cardiomyopathy. Research objectives: analysis of data on 67 children from 0 to 16 years old who received inpatient treatment for heart disease at the Osh interregional children's clinical hospital from 2016 to 2020. Research results: analysis of the EchoCG data of the study showed that the nature of changes in intracardiac hemodynamics depends on the age of the child: the most pronounced shifts in EchoCG indicators, as a rule, are inherent in young children with inflammatory changes in the myocardium and dilated cardiomyopathy, less pronounced for children of other age groups. Conclusions: indicators reflect severe degree of heart damage in children of this age and indicate, most likely, a weak level of heart compensatory-adaptive mechanisms.