Atrial flutter refers to atrial flutter, which, if left untreated, may affect normal life, cause heart disease, and be life-threatening. 1. Impact on normal life: In atrial flutter, symptoms such as panic, shortness of breath, fatigue and chest pain may occur. In severe cases, it may affect hemodynamics and lead to low blood pressure as well as dizziness. It may affect daily work, study and life. 2. Trigger heart disease: prolonged atrial flutter may increase the risk of thrombosis, which may lead to thromboembolism. If the thrombus is dislodged, it may cause myocardial infarction or angina pectoris. 3. Life-threatening: If there are complications, such as more harmful myocardial infarction, the patient will experience persistent chest tightness, breath-holding, chest pain, dyspnea, sweating, and sudden death. If the patient has a large acute myocardial infarction, he or she may even die suddenly. When atrial flutter occurs, it is recommended to seek timely medical attention, follow the doctor’s instructions for further examination, and actively cooperate with the doctor’s treatment.