In recent years, it has been discovered that ions coming out and going in and out of the human cardiac cell membrane are supposed to operate according to a certain pattern, and if there is a serious malfunction, it is called ion channel disease. Mild abnormalities in ion channel activity generally do not cause major problems. But once it constitutes ion channelopathy, it is a major problem, and in severe cases it can cause sudden death at any time by triggering severe ventricular ectopic arrhythmias. Ion channelopathies can be caused by congenital genetic abnormalities or by acquired heart disease, for example. Ion channel abnormalities can be detected by routine electrocardiograms, together with the presence of similar electrocardiogram abnormalities in family members at the same time, and the necessary genetic tests to confirm the diagnosis. That is why sometimes doctors will ask the family members of the patients who can go to the hospital to have their ECG checked. We hope that such patients and their families will actively cooperate. The ECG of common ion channelopathies may show specific prolonged or shortened QT intervals, abnormally large J waves, and abnormal ST-T ECG changes. Some ion channelopathies have extremely specific ECG waveforms, such as the Brugada wave that can be seen on the ECG of patients with Brugada syndrome. These sky-like terms are not something you need to learn to recognize and understand. As long as the doctor suspects the disease, you should actively cooperate with the doctor to do something useful to confirm the diagnosis can be done. For congenital ion channelopathies, if syncope has ever occurred due to a serious arrhythmia such as ventricular fibrillation, especially if it occurs repeatedly, an implantable defibrillator (ICD) should be considered for prevention and treatment. For ion channel abnormalities caused by other acquired diseases, you need to actively treat the primary disease that caused it, and then look for cardiogenic syncope to decide whether to install an ICD. To sum up, you need to have regular checkups to detect relevant abnormal ECG waveforms early, and then seek consultation with a cardiologist.