Sudden cardiac death refers to the sudden mortality caused by heart diseases, and the reasons for sudden cardiac death primarily include the following aspects:

First, structural heart diseases, such as coronary heart disease and acute myocardial infarction; acute myocardial infarction is currently the most common cause of sudden cardiac death.

Second, certain ion channel diseases, such as Brugada syndrome, or long QT syndrome. These types of ion channel diseases often coincide with malignant ventricular arrhythmias, such as torsade de pointes ventricular tachycardia or ventricular fibrillation, thus leading to the occurrence of these fatal phenomena.

Third, severe arrhythmias, such as severe bradycardia or ventricular tachycardia related to structural heart disease, often trigger malignant ventricular arrhythmias, leading to death.