European Journal of Cardiovascular Medicine

Background and Objectives: Alterations in the QT interval represent a crucial electrocardiographic parameter that holds clinical significance not only among adults but also in the pediatric population. The prevalence of conditions leading to sudden fatalities in children has propelled researchers to explore the realm of electrocardiographic (ECG) investigations. The primary objective of study was to establish normative QT values for pediatric subjects across different age groups and genders. Methods: Employing a cross-sectional design, we enrolled 175 healthy children (100 males, 75 females) and recorded their electrocardiograms. To ensure the homogeneity of the study cohort, individuals with congenital or acquired cardiovascular disorders were excluded from participation. Result: Heart rate exhibited an inverse relationship with the QT and QTc interval, whereas the RR interval displayed direct proportional correlations with both the QT and QTc intervals. As age increased, heart rate declined, while other ECG parameters exhibited progressive increments. Despite the inverse correlation between heart rate and QT/QTc interval, a positive correlation was observed between QT/QTc and RR interval. Conclusion: The integration of ECG as a routine investigative tool for pediatric subjects is warranted, as it aids in the early diagnosis of congenital and acquired cardiac conditions and arrhythmias, discernible through QT interval assessments.