EKG sinus rhythm is a normal heart rhythm. There is a special knot on the right atrium, called the sinus node, the body’s normal heartbeat should be issued from here, so the medical will be the normal origin of the sinus node of the heart rhythm is called sinus rhythm, which is the normal rhythm of the heart. The sinus node is a structure that can have a rhythm and automatically generates electric current, which carries out electrical activity in all parts of the heart in accordance with the conduction sequence of the heart, thus producing rhythmic cardiac contraction and diastole and accomplishing normal physiological activities. Sinus rhythm is characterized by an upright P-wave in the I, II, and AVF leads and an inverted P-wave in the AVR lead, which is sinus rhythm on the electrocardiogram. In conclusion, sinus rhythm is the normal rhythm of the heart. If there is a sinus rhythm that is too fast or too slow, it may indicate other diseases, but the cardiac pacing point is normal.