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 ...

The heart's normal sinus rhythm is created by electrical signals that spread throughout the heart in an organized manner along a certain route at a particular speed. This article explores sinus ...

then the term “ectopic atrial rhythm” is used. Because the origination of this electrical activity is not from the sinus node, the P wave would not have its normal sinus appearance ― that is ...