Quantitative characteristics of cardiomyopathy phenotypes in children and adults by the value of deviation from the norm of echocardiographic parameters

The widespread use of the term “cardiomyopathy” in modern cardiology dictates the need to systematize and concretize the use of this term. Based on the approximation of changes in the function, cavities and thickness of the walls of the chambers to known dilated, hypertrophic and restrictive cardiomyopathy, imaging methods in cardiology have made it possible to combine many pathological changes in the chambers of the heart into certain sets of visual perception and to form the concepts of phenotypes and phenotypes of most heart diseases.Aim: To develop quantitative criteria for phenotypic changes in the left ventricle (LV), which can be used to control the dynamics of the disease and evaluate the effectiveness of treatment based on the results of a retrospective analysis of a large volume of digital data of echocardiographic studies in patients with myocardial diseases and healthy individuals.Material and Methods. A retrospective analysis of echocardiography protocols for the period 2009-2021 was performed in 13023 healthy individuals aged 2 days to 59 years and 317 patients with various heart diseases: hypertrophic, dilated and restrictive cardiomyopathies, and LV non-compaction myocardium aged 4 days to 60 years.Results. Criteria have been developed and proposed for the quantitative assessment by Z-index of pathological phenotypes of the left ventricle, which have a high (more than 95%) negative specificity in healthy individuals of any age and a positive one in patients with cardiomyopathies. The ability to quantify the dynamics of the course of diseases occurring with manifestations of restriction, dilation and LV hypertrophy was shown.