Abstract
Purpose: This article is about an unusual clinical case of a 14-year-old boy with hypertrophic cardiomyopathy (HCM).Ejection fraction (EF) and shortening fraction (FS) of the left ventricle in children with HCM remain within a normal range for an extended period of time. Therefore, detection of a decrease in segmental myocardial contractility at the initial stage of the disease presents a diagnostic problem.
 Methods: The clinical characteristics of the patient, study results, and analysis of the left ventricular myocardial strain using 2D speckle-tracking mode in an echocardiographic examination are presented.
 Results: A decrease in strain indicators in the anterioseptal, anterior, and anterolateral segments of the left ventricular myocardium and a compensatory increase in the contralateral segments were revealed. This served as an indication to start treatment.
 Conclusions: A decrease in strain indicators in the 2D speckle- tracking mode is most informatively represented by changes in segmental systolic function of the left ventricle at the initial stage of HCM.
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