A QRS duration of greater than 0.12 seconds is considered abnormal. The QRS duration will lengthen when electrical activity takes a long time to travel throughout the ventricular myocardium.

The QRS rate for junctional rhythms is typically less than 100 ... in black/African athletes that are normal variants and should be distinguished from abnormal findings suggestive of a pathological ...

The goal of ECG interpretation in athletes is to classify the ECG as: (1) ‘normal’—no further evaluation needed or (2) ‘abnormal’—further evaluation needed. Normal ECGs include common, ...

This is referred to as "LVH with QRS widening". Also, repolarization may be affected via similar mechanisms which can result in abnormal ST segments or T waves. This is referred to as "LVH with ...