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 ...

The ECG findings presented as normal in athletes were established by an international consensus ... and the QRS complex usually narrow unless the baseline QRS has a bundle branch block. Sinus rhythm ...

If there is sinus rhythm, and the heart rate is less than 60 beats per ... If there are no P waves present, or the P wave morphology is not normal, then the exact rhythm must be determined.