This is not recognizable on the 12-lead ECG because the time that SA node fires is not able to be determined. The ECG may simply show sinus rhythm or sinus bradycardia. This is different than a ...

Ectopic, originating outside of the SA node, and thus, the P wave morphology ... or the ectopic PR interval will be prolonged. The ECG will show a premature, ectopic P wave and then no QRS complex ...