Sinus heart rate should actually be called sinus rhythm, which is the characteristic rhythm of a healthy human heart. The normal heart rate of an adult at rest is usually 60-100 beats per minute. Sinus rhythm originates in the sinus node, where the normal heartbeat of the human body is emitted from and which is the pacing point of the heart. The sinoatrial node is a piece of tissue located on the right atrial epicardium, which can automatically and rhythmically generate electric currents, that is, command signals, and only under the orderly operation of this system can the heart’s muscles coordinate their work and complete the work of blood supply with uninterrupted activity 24 hours a day.