The spectral parameters of heart rate variability at children with premature beats

Abstract

Introduction: Premature ventricular contractions are early depolarizations of the myocardium originating in the ventricle. PVCs are common with an estimated prevalence of 40% to 75% in the general population on 24 to 48 h Holter monitoring. Frequent premature contractions are rare in healthy children. Purpose: Evaluation of the spectral parameters of heart rate variability at children with supraventricular and ventricular premature beats. Material and methods: The study included I group 160 (84,2 %) children with premature supraventricular and ventricular beats, average age (13,32±0,23) years and II group, healthy children 30 (15,79 %), average age (12,2±0,72) years, who were examined with ECG, ECOCG, ECG Holter monitoring over 24 hours, and ambulatory monitoring of blood pressure over 24 hours. Results: Ambulatory ECG Holter monitoring for 24 hours have been determined supraventricular premature beats in 86,25% cases vs 13,33% healthy children (p<0,001) and supraventricular tachycardia in 43,38% cases I group vs 13,33% II group (p<0,001). Spectral parameters of the heart rate variability at children have been calculated during 24 hours period and there were observed a prevalence of waves with low and very low frequency at children with premature beats. Conclusions: Results of the study showed that cases from I group are associated with supraventricular premature beats in 86,25% cases. Analysis of the spectral parameters of the heart rate variability on ECG Holter monitoring over 24 hours, demonstrates prevalence of waves with low and very low frequency at children.