The QRS complexes are narrow (0.08 sec) and have a normal morphology and normal axis between 0° and +90° (positive QRS complex in leads I and aVF). The average heart rate is 42 bpm.

Thus, normal conduction of an electrical impulse through the atrioventricular, or AV, node, then to the ventricles via the His-Purkinje system, is fast and results in a normal QRS duration.

In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).

This results in a rightward QRS axis. There will also be low voltage in leads V3-V6 since these leads are placed on the left side of the chest and no heart is present at that location.

With normal conduction of the QRS complex the secondary ST-segment and T-wave changes were eliminated. No significant ST-segment alteration was present.