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Article History

Received: 12 May 2022

Revised: 22 September 2022

Accepted: 18 November 2022

First Online: 27 April 2023

CONFLICT OF INTEREST

: The authors declare the absence of an obvious and potential conflict of interest related to the publication of this article.

: All studies were carried out in accordance with the principles of biomedical ethics formulated in the Declaration of Helsinki of 1964 and its subsequent updates and approved by the local ethical committee Research Institute of Cardiology (Tomsk) (protocol No. 210 dated February 18, 2021).

: The informed consent obtained from the legal representatives of each parent of the childsigned after explaining the potential risks and benefits and the nature of the study to be undertaken.

: Pavlyukova Elena Nikolaevna—concept development (idea formation; formulation and development of key goals and objectives), research (study of children’s heart contractility using the “spot trace” method (Speckle Tracking Imaging—2D Strain), analysis and interpretation of the received instrumental data), preparation of a published work in terms of data visualization/display, preparation and editing of the text, and approval of the final version of the article. Kolosova Marina Vladimirovna—concept development (idea formation; formulation and development of key goals and objectives), research (preparation of clinical material, analysis and interpretation of the study data, analysis, and generalization of literature data), preparation of a published work in terms of data visualization/display, preparation and editing of the text, and approval of the final version of the article. Neklyudova Galina Vladimirovna— research (collection, systematization, analysis and interpretation of clinical trial data, post-processing processing of instrumental research methods, the “spot trace” method (Speckle Tracking Imaging—2D Strain)). Karpov Rostislav Sergeevich—general management of the research group, development of the concept (formation of the idea; formulation and development of key goals and objectives), approval of the final version of the article.