thus normal sinus rhythm. If the P wave has a morphology different from the typical sinus morphology, it is termed ectopic, meaning coming from somewhere other than the sinus node. The second ECG ...

Sinus rhythm (a.k.a. normal sinus rhythm ... beats per minute in the setting of a sinus P wave on the ECG. Note that ectopic atrial rhythms can have a P wave before each QRS complex, however ...

Prematurity of an ectopy is determined by the intrinsic escape rhythm of the ectopic focus ... it must precede the next sinus complex; otherwise, sinus depolarization would suppress it 2,3.

Note the gradual onset of the junctional mechanism as the sinus cycle length increases from 635-670 milliseconds while the ectopic rhythm usurps the sinus rhythm at a more rapid cycle length of ...