“…Circadian variation of QT dispersion in healthy subjects has been suggested by Ishida et al, 8 Molnar et al, 9 Lee et al, 10 Yetkin et al, 19 Batur et al, 20 Bilan et al, 21 and Bonnemeier et al, 22 but the results are contradictory and the studies have different setups in respect to number of leads used, measurement frequency, and whether heart rate correction of QT dispersion is used or not.…”