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 ...

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. A sinus morphology is an upright P wave in lead II and ...

Sinus rhythm resumes with increased heart rates during exercise ... The standards for QRS voltage have been derived from studies of populations of clinically normal children. Furthermore, the limited ...

Electrocardiograms can differentiate normal sinus rhythm from various arrhythmias. When the sinus rhythm described above is in the normal range of 60-100 bpm, it's called normal sinus rhythm.