The literature notes that reentry mechanisms underlie many cardiac arrhythmias. These are associated with the passage of impulses through accessory pathways (AP), the ECG manifestation of which are forms of premature ventricular excitation (PVE) (WPW, CLC, and Mahamma-Levi syndromes and phenomena). This syndrome is quite common in the pediatric population (up to 0.5-0.8%), but they do not always become life-threatening arrhythmias. The leading factors are disturbances in the child's postnatal development, including the conduction structures of the heart. The initial electrophysiological properties of the myocardium (myocardial instability) also play a significant role.

arrhythmia, accessory pathways, preexcitation of the ventricles, children.

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