Clinical children’s arrhythmia is relatively common, for example, the heart rate of a 5-month-old child is not more than 160 beats per minute/minute, and the older the child is, the faster the heart rate is. The most common are the following: 1, sinus arrhythmia: manifested with breathing and change, inhalation heart rate increases, more obvious when exhaling, some can reach 165-170 beats per minute, exhalation heart rate slows down to 140 beats per minute or so, in the fever, exercise, emotional stress, crying, the child’s heart rate will increase; 2, sinus tachycardia: manifested as a normal heart rate of the pediatric population depending on the age of the child, if the The newborn’s heart rate is more than 200 beats per minute, the heart rate under 1 year old is 160 beats per minute, and more than 140 beats per minute when 1-2 years old, then it is called sinus tachycardia. It is common in exercise, stress, crying, fever, anemia, shock, myocarditis, heart failure, etc.; 3, sick sinus syndrome: it is due to sinus node failure and causes the abnormalities of agitation and conduction. Children can be due to myocarditis, cardiomyopathy, digitalis poisoning, congenital heart disease caused by sick sinus node syndrome; 4, paroxysmal tachycardia: that is, the slow-fast syndrome, this is a kind of relatively terrible arrhythmia, children, if the emergence of the child is also to be actively treated. The incidence of this disease has 60% occurred in healthy children, the patient’s original pre-excitation syndrome, there can also be respiratory infections, congenital heart disease, myocarditis, hypoxia, digitalis intoxication, hyperthyroidism, etc. Children under 4 months of age are common, often a sudden onset of this time, there can be irritability, pallor, cold sweating, cold limbs, shortness of breath, do not eat milk, cyanosis, etc., which can last for a few seconds, minutes or hours suddenly stop. It may last for a few seconds, minutes, or hours and stop suddenly. The blood pressure will be low and the heart sounds will be weak on auscultation. When the heart rate of newborns reaches 300 beats per minute, infants and young children reach 200-300 beats per minute, and older children reach 100-180 beats per minute, it needs to be actively dealt with; 5. Premature beats: it is due to premature atrial and ventricular pulsations, and there is a single premature cardiac beat, which can be categorized into atrial, ventricular, and junctional premature beats, which can be diagnosed by electrocardiogram.