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.
Normal range at rest is between 60-100 beats per minute (bpm). The basic way to calculate the rate is quite simple. You take the duration between two identical points of consecutive EKG waveforms such as the R-R duration. Take this duration and divide it into 60.