In our work, we often encounter the problem that when patients see the ECG report, especially those who have less ECG, they often ask “Doctor, it says sinus rhythm, what does it mean, is there something wrong with my heart?”. . Here’s what sinus rhythm is all about. The heart, the most important organ of human beings, is composed of countless cardiomyocytes, which can be divided into ordinary myocardium and special myocardium according to their functions. The common myocardium, which makes up the atria and ventricles, is contractile and acts as a “pump” to send blood throughout the body. The special myocardium consists of the sinoatrial node, intersegmental bundle, atrioventricular node, Hitchcock’s bundle, right and left bundle branches, and Purkinje fibers, which are the conduction system of the heart and are autoregulatory in nature, acting as a “transmitter and transmitter” to direct the activity of the atria and ventricles. The sinus node is the most autoregulatory, followed by the atrioventricular node. Under normal conditions, the whole heart beats rhythmically according to the electrical impulses from the sinoatrial node, just as everyone in the kingdom obeys the king’s orders. Therefore we call the normal heart rhythm, sinus rhythm. When the heart is in a pathological state, the autoregulation of the sinus node decreases, or the autoregulation of the AV node, atria, or ventricles increases, and the dominance of the sinus node is replaced by the AV node, atria, or ventricles, at which point the heart rhythm is known as atrioventricular junctional rhythm, atrial rhythm, or ventricular rhythm. After reading the above introduction, when you see the words sinus rhythm again, there is no need to be nervous in the future, it is a normal heart rhythm.