Fig. 4. Parameter of correction for calculation of corrected QT interval using the Fridericia formula (1/ 

heavy dashed line ) and the Bazett formula (1/ 

light dashed line ) are displayed for heart rates between 40 and 125 beats/min. The approximated parameter of the Fridericia correction (approximated QTc  ^f ) is displayed by the  solid line (   appendixand  table 1 ).