Sudden cardiac collapse due to often-prescribed drugs causing QTc prolongation

As all clinicians know, the conventional ECG wave points are identified as PQRST, from P, the atrial contraction, to T, the ventricular repolarisation wave. The length of the ventricular section, from Q to the end of T, is the QT interval. For comparison of different patients, each individual’s QT length in milliseconds is converted (or standardised) to what it would have been if their heart rate had been 60 beats/minute. This approximation is the QT corrected (or QT_c) interval.