[Comparison of four formulas of adjusting QT interval for the heart rate in young elite athletes]. / Intervalle QT chez les athlètes : comparaison de quatre formules de correction dans une population de jeunes sportifs de haut niveau.

ABSTRACT

PURPOSE: Sudden cardiac death in young athlete is always tragic. Some international guidelines recommend the realization of an electrocardiogram before practicing competitive sports to carry out the risk of sudden cardiac death due to genetic cardiopathy like QT long syndrome. Unfortunately, the diagnosis can be difficult because intensive sport can increase the QT interval over normal recognized values for sedentary people. Using a QT correction formula free of heart rate appears essential. PATIENTS AND METHODS: Four hundred and forty-six young athletes (aged 10 to 18) had an electrocardiogram. QT intervals were measured and four methods were used to correct the QT interval for heart rate. RESULTS: The Bazett formula performed the worst in terms of rate adjustment success. Hodges and Fridericia formulas are the best both in males and females, independently of age. Female had longer QTc intervals than males. CONCLUSION: The most widely used Bazett formula should be surrendered whereas Hodges and Fridericia formulas should be preferred, particularly in young athletes.