These lines are comprised of three main parts: In normal sinus rhythm, the P-P interval (the time between consecutive P waves) is the same throughout the ECG. Also, the heart rate (how fast the ...

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...

Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node. This results in an upright P wave in lead II on the ECG.