Atrial flutter is a tachyarrhythmia originating in the atria, a rapid and rhythmic electrical activity of the atria. It is often secondary to organic heart disease, and patients may experience chest tightness and severe heart failure. Atrial flutter mostly occurs in organic heart disease, such as coronary heart disease, congenital heart disease, rheumatic heart disease, hyperthyroidism and so on can lead to changes in the structure of the heart, especially the atria enlargement, leading to the heart’s electrical activity disorders, induced atrial flutter occurs. The severity of atrial flutter is related to the primary disease and the speed of the ventricular rate of atrial flutter. The more severe the primary disease and the faster the ventricular rate, the more serious the patient’s condition. Atrial flutter can lead to symptoms such as palpitations, weakness, chest tightness, and in severe cases, fainting. Atrial flutter is a relatively severe arrhythmia that is treated under the supervision of a cardiologist, and some patients may undergo radiofrequency ablation to terminate episodes of atrial fibrillation.