Again, in contrast with the Bethesda guidelines, the recommendation for competitive sports restriction was unchanged for genotype-positive patients with normal or borderline QT values.45 As is evident ...

The normal QT interval is controversial ... Due to the effects of heart rate, the corrected QT interval (QTc) is frequently used. The QTc is considered prolonged if greater than 450 ms in males ...

The absolute QT interval on this ECG is approximately 640 ms which is quite long, but the QTc when accounting for the slow heart rate is about 380 ms which is normal. This is why the "corrected QT ...