Two channels in the heart one is an extra signaling channel for cardiac conduction, mostly referred to as preexcitation syndrome, and the other is a congenital extra channel inside the heart, referred to as atrial septal defect, ventricular septal defect, aortic malformations and so on. 1. Conduction channel: Pre-excitation syndrome or supraventricular tachycardia is a congenital growth of an extra electrical conduction signal between the atria and the ventricles in some people, which may be asymptomatic or may cause tachycardia, low blood pressure, dizziness, and so on, and in severe cases, angina pectoris and cardiac insufficiency may occur. 2. Congenital heart disease: It is an extra channel in the heart, such as atrial septal defect, ventricular septal defect, arterial ductus arteriosus, aortic malformation and so on. These conditions can affect normal life and can present with cyanosis, dyspnea, and so on. Therefore, two channels patients, need electrocardiogram, cardiac ultrasound examination to confirm the diagnosis, for the preexcitation syndrome repeated tachyarrhythmia incidence of patients can be surgical treatment, for congenital heart disease patients should be interventional therapy, under the guidance of a professional doctor for diagnosis and treatment.