What does sinus rhythm mean?

In general, sinus rhythm refers to the heart rhythm originating from the sinoatrial (SA) node and represents the normal electrical rhythm of the heart. If any arrhythmia is detected, it is recommended to seek medical attention promptly. The detailed explanation is as follows:

Sinus rhythm is the normal rhythmic electrical activity of the heart, initiated by electrical impulses generated in the SA node of the heart. These impulses travel downward through the right atrium, first reaching the atrioventricular (AV) node, then dividing into left and right bundle branches to propagate further down, triggering ventricular contraction and completing a full cardiac cycle. Under normal conditions, the rate of sinus rhythm ranges between 60 and 100 beats per minute (bpm), which is considered normal and typically does not cause noticeable discomfort. However, when changes occur in cardiac function or heart structure that affect the myocardium's normal ability to contract and relax, the heart rate may change. In adults, if the sinus rhythm exceeds 100 bpm, it is termed sinus tachycardia; if it falls below 60 bpm, it is referred to as sinus bradycardia.

In summary, sinus rhythm is a normal manifestation of the heart's electrical activity and reflects the overall health of the heart. Tests such as electrocardiography (ECG) can help evaluate sinus rhythm, enabling timely detection and management of cardiac issues.