The ECG findings presented as normal in athletes were established by an international consensus panel of ... In an ectopic atrial rhythm, P waves are present but are a different morphology compared to ...

This results in an upright P wave in lead II on the ECG. If there is a P wave before every QRS complex, and it has a sinus morphology, then normal sinus rhythm, or NSR, is said to be present.

Ectopic, originating outside of the SA node, and thus, the P wave morphology would be different from the normal sinus P wave ... will be prolonged. The ECG will show a premature, ectopic P wave ...

Figure 18B shows the 12-lead ECG of the entrainment tracing of Figure 18A. The QRS morphology in all 12-lead ECGs during entrainment is identical to that of pacing in the absence of tachycardia as ...