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.
This electrical activity, in turn, is the result of small molecules (ions such as sodium and potassium) passing in and out of channels in the membranes surrounding heart cells. A prolonged QT interval indicates an abnormality in electrical activity that leads to irregularities in heart muscle contraction. One of these irregularities is a specific pattern of very rapid contractions (tachycardia) of the lower chambers of the heart called torsade de pointes, a type of ventricular tachycardia.