Patients with heart disease should pay special attention to some common heart-like diseases that can easily induce sudden death, the following is a popularization of various types of heart disease that are more likely to induce sudden death. Acute heart failure Acute heart failure from any cause, if not treated with timely intervention, can lead to circulatory failure itself as well as secondary arrhythmias. Acute heart failure is usually caused by acute massive myocardial infarction, acute myocarditis, valvular heart disease, and mechanical causes such as massive pulmonary artery embolism. Arrhythmogenic right ventricular dysplasia. Valvular heart disease In follow-up of patients after aortic valve replacement, a high incidence of ventricular arrhythmias has been found, especially after aortic stenosis, or multivalve surgery, where sudden death occurs in association with ventricular arrhythmias as well as thrombosis or embolism. Other valve stenoses have a low incidence of sudden death, and valve closure insufficiency, especially chronic aortic valve closure insufficiency or acute mitral valve closure insufficiency, can cause sudden death, but the risk is much lower than that of aortic valve stenosis. Ventricular hypertrophy Left ventricular hypertrophy is an independent risk factor for sudden cardiac death, and other combined causes of sudden death include arrhythmias. The causes of ventricular hypertrophy include; hypertension, heart disease (with or without atherosclerosis), valvular heart disease, obstructive or nonobstructive hypertrophic cardiomyopathy, and primary pulmonary hypertension with right ventricular hypertrophy, all of which are at risk for sudden cardiac death, especially severe hypertrophy that is prone to arrhythmias and death. Hypertrophic obstructive cardiomyopathy Early clinical and hemodynamic studies have confirmed that hypertrophic obstructive cardiomyopathy has a risk of sudden cardiac death, with fatal arrhythmias being the main cause of sudden death. Dynamic electrocardiography: most of them present with premature ventricular beats or short bursts of ventricular tachycardia or induce fatal arrhythmias during cardiac electrophysiological examinations. In athletes under 35 years of age, hypertrophic cardiomyopathy is the better leading cause of sudden death, while in athletes over 35 years of age, ischemic heart disease is the better common cause of sudden death. Advances in the treatment of congestive heart failure have improved the long-term prognosis for this group of patients, but sudden death has not decreased in some patients with hemodynamically stable heart failure. Studies have shown that up to 40% of deaths in heart failure occur suddenly and that the risk of sudden death increases with deteriorating left heart function. Arrhythmogenic mechanisms (VT/VF and bradycardia, cardiac arrest) are associated with sudden death. In patients with cardiomyopathy, the overall mortality rate is lower in those with better cardiac function (class 1 or II) than in those with poor cardiac function (class III or IV). However, sudden death occurs more frequently in those with better cardiac function. After myocardial infarction, ventricular arrhythmias and reduced ejection fraction are both risk factors for sudden death. Ventricular arrhythmias have a high incidence in patients with arrhythmogenic right ventricular dysplasia, especially recurrent ventricular tachycardia, and although the symptoms of ventricular tachycardia were recognized many years ago, the risk of sudden death was not fully appreciated. Isolated right ventricular cardiomyopathy and arrhythmogenic right ventricular dysplasia have similar histopathological features, and perhaps they are different types of the same disease, with right ventricular cardiomyopathy having a high risk of sudden death.