Under normal circumstances, the excitation of the heart starts from the sinus node, which emits regular electrical excitation (60-100 beats/minute) and passes through the atria and atrioventricular node to the ventricles in turn, causing the whole heart to contract and diastole in a regular and coordinated manner, thus ensuring the pumping function of the heart to meet the needs of the body. Atrial fibrillation, short for atrial fibrillation, is an extremely common type of tachyarrhythmia. In atrial fibrillation, the direction of excitation in the atria is inconsistent and the frequency is fast and irregular, which deprives the atria of effective contraction. In atrial fibrillation, the frequency of atrial excitation is as high as 300-600 beats/min. Although these excitations cannot all reach the ventricles due to the protective effect of the atrioventricular node, the ventricular rate (heart rate) can still reach 100-160 beats/min, which is not only much faster than the normal sinus heart rate, but also has an absolutely irregular rhythm. Studies have shown that there are about 10 million patients with atrial fibrillation in China, and the prevalence of atrial fibrillation in adults ranges from 1% to 6%, and the prevalence of atrial fibrillation increases sharply with age, and has even reached 10% in people over 75 years of age.