EKG sinus rhythm is a normal rhythm, which is the rhythm of the heart caused by the pacing of the sinus node, and whether the EKG is normal or not needs to be further determined based on the waveform. Sinus rhythm is a normal rhythm of the heart, which is the process of generating impulses from the sinus node and conducting them to the ventricles via the structures of the interjunctional bundle, atrioventricular node, right and left bundle branches, and Purkinje fibers, causing excitation. Sinus rhythm is characterized on the ECG by the regular appearance of P waves, which are upward in leads I, II, and aVF and downward in lead aVR. Sinus rhythm indicates that the heart has a normal pacing position, but it can also be accompanied by conduction velocity abnormalities such as sinus tachycardia with a heart rate of more than 100 beats/minute and sinus bradycardia with a heart rate of less than 60 beats/minute; conduction block such as second-degree type I and second-degree type II atrioventricular block; ectopic pacing such as ventricular preterm systole and atrial preterm systole; and myocardial abnormalities such as ischemia and myocardial infarction. When the ECG sinus rhythm, need to be judged by the doctor whether there are other ECG abnormalities, early diagnosis and early treatment, so as not to delay the condition.