This term can be confusing, as not all ECG leads contain all three of these waves; yet a “QRS complex” is said to be present regardless. For example, the normal QRS complex in lead V1 does not ...

The ECG findings presented as normal in athletes were established by an international consensus panel ... In Mobitz type I second-degree AV block, the PR interval progressively lengthens from beat to ...

However, the P wave or T wave axis can also be measured ... some shortcuts to quickly determine the axis are outlined below. The normal QRS axis should be between -30 and +90 degrees.

These ECG voltage attenuations are of extracardiac mechanism, and impact the amplitude of QRS complexes, P-waves, and T-waves, occasionally resulting also in shortening of the QRS complex and QT ...