Bad Day at Black Rock is a suspenseful, mature, masculine movie (something Hollywood does not really produce anymore) laden with talented actors and patriotic veterans. Tracy plays a man who served our country in WW 2, while Ryan, Marvin, and Borgnine actually did.
This correction formula is usually programmed into the machine that measures your ECG and the corrected QT interval (QTc) value is part of the information printed on the ECG. For men the QTc is normally less than 420 msec and for women the QTc is normally less than 440 msec.
In one literature analysis, patients were using between 2 and 1680 mg/day and the percentage of patients with prolonged QTc intervals varied from 9% to 88%. 1 ECG readings showed QTc intervals of 413-457 msec with a change from baseline of 12-42 msec. The analysis found that some studies showed a dose-dependant effect on increasing QTc interval, while others did not.