Arrhythmia can lead to serious complications such as blood circulation disorders, changes in heart rhythm, and sudden death. Blood circulation disorder: When arrhythmia occurs, the contractile function of atria and ventricles is changed, which decreases the volume of blood discharged from the heart and causes patients to experience symptoms such as palpitations, chest tightness and weakness. Heart rhythm changes: more serious arrhythmia can lead to sinus arrest, sinus block and bradycardia, and slow-fast syndrome. Sudden death: The most common cause of sudden death is arrhythmia, with ventricular tachycardia, ventricular fibrillation and conduction block causing the highest incidence of death by exhaustion. It is recommended that people with arrhythmias seek prompt medical attention and follow medical advice for standardized treatment.