What does NSR stand for in cardiology?

In cardiology, NSR stands for "Normal Sinus Rhythm." This term describes the heart's natural rhythm when it is functioning properly, originating from the sinoatrial (SA) node, which is the natural pacemaker of the heart. A normal sinus rhythm indicates that the electrical impulses in the heart are being generated and conducted in a normal and expected manner, resulting in a steady beat that reflects a healthy cardiovascular system.

The characteristics of normal sinus rhythm include a regular heart rate typically ranging from 60 to 100 beats per minute, and the presence of consistent P waves on an electrocardiogram (ECG), which signify proper atrial depolarization. Understanding NSR is fundamental in cardiology, as deviations from this rhythm can indicate various cardiac issues that may require further investigation and management.