The characteristics of atrial fibrillation include the following three types: first, is the absolute irregularity of the heart rhythm, see patients with atrial fibrillation, the heart rhythm fast and slow is relatively large fluctuations, sometimes 160 times/min, sometimes 80 times/min, sometimes 120 times/min, beating very large, the heart rhythm is absolutely irregular; second, is the intensity of the heart sound is not equal, the force of each heart contraction is not the same, this kind of patients also The third clinical manifestation will appear; third, is the shortness of the pulse, precisely because the strength of each contraction of the heart is different, the amount of blood output inside the heart is also unequal in size, so the patient’s pulse rate and heart rate are not equivalent, the heart rate of normal people is equal to the pulse rate, but the pulse rate of patients with atrial fibrillation, the heart rate may be 120 times/min, the pulse rate is always less than the heart rate, these are the three main characteristics of atrial fibrillation.