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The presented lecture focuses on epidemiology, classification, pathophysiology and clinical course of ventricular arrhythmia in children. Special attention is to the issues of risk evaluation for the development of arrhythmic dysfunction of myocardium at the background of exact rhythm disorder. The term “idiopathic” ventricular arrhythmia is considered, and the main extracardiac causes of ventricular arrhythmia are described, those relieve is crucial for treatment success. Also it is underlined that organic heart lesion in a child with ventricular arrhythmia is of a great importance for the disease outcomes and scoring of risk. Based upon national and international guidelines the recommendations are provided for follow-up of the children with ventricular arrhythmia, selection of antiarrhythmic therapy and radiofrequency ablation of arrhythmia source.