A minority of them has a QTc ≥480 ms in these subjects, QTc interval remains prolonged. Normal QTc interval does not change over time in preadolescents. For resting heart rate (HR) ≥82 b.p.m., QTcF was independent from HR contrary to QTcB. Mean difference in the calculation of QT between the two formulae was 25 ± 11 ms (P < 0.0001). Conversely, children with 460 ms < (QTcB) <480 ms had a normal QTc interval at the end of the study. In those with QTcB and QTcF ≥480 ms, QTc duration persisted abnormal during the follow-up and they were disqualified. Ten children (0.68%) had an abnormal QTc. At baseline QT interval corrected with the Bazett formula (QTcB) was 412 ± 25 ms and QT interval corrected with the Fridericia formula (QTcF) 387 ± 21 ms, with no changes during follow-up. QT interval was corrected with Bazett (B) and Fridericia (F) formulae. Each athlete was evaluated at baseline, mid-term, and end of the study (mean follow-up: 3 ± 1 years). The aim of this prospective, longitudinal study was to determinate the distribution of QT interval in children practicing sport and to evaluate changes in QT duration overtime.Ī population of 1473 preadolescents practising sport (12.0 ± 1.8 years, 7-15 years) was analysed. However, the interpretation of ECG is sometimes challenging in children, particularly for the repolarization phase. Twelve-lead electrocardiogram (ECG) is an established tool in the evaluation of athletes, providing information about life-threatening cardiovascular diseases, such as long QT syndrome.
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