Normal sinus rhythm is indeed a good thing, as it indicates that the heart is beating in a regular and healthy manner. As a cardiologist, I can explain that the term "normal sinus rhythm" refers to the heart's electrical activity originating from the sinus node, which is the heart's natural pacemaker. This rhythm is considered the standard for a healthy heart. The criteria for normal sinus rhythm include: - Normal P waves, which are the small deflections on an ECG that represent the electrical activity of the sinus node. - A normal heart rate, which is typically between 60 to 100 beats per minute for an adult. - All other ECG measurements being normal. When all these criteria are met, it means the heart is functioning as it should, and there are no signs of arrhythmia or other electrical disturbances. read more >>

By convention, the term "normal sinus rhythm" is taken to imply that not only are the P waves (reflecting activity of the sinus node itself) normal in morphology, but that all other ECG measurements are also normal. Criteria therefore include: Normal heart rate (classically 60 to 100 beats per minute for an adult).read more >>