Sudden cardiac failure is a syndrome that occurs when the heart function decreases beyond its compensatory function due to the aggravation of heart disease (heart failure is a group of syndromes caused by various structural or functional heart diseases that lead to impaired ventricular filling and/or ejection capacity. The clinical manifestations are mainly dyspnea, weakness and limited physical activity and edema. (Treatment of the disease should include preventing and delaying the onset of heart failure, relieving the symptoms of clinical heart failure, improving its long-term prognosis and reducing mortality). Cardiac pathology is increasing and cardiac decompensation exceeds its compensatory function. Heart failure can be caused by almost all types of cardiac and macrovascular diseases. Heart failure reflects the pumping dysfunction of the heart, that is, the diastolic insufficiency of the heart muscle. From a pathophysiological point of view, myocardial diastolic dysfunction can be broadly divided into two categories: primary myocardial damage and myocardial function that eventually develops from compensatory to decompensated due to long-term volume and/or pressure overload of the heart: 1. Primary myocardial damage: coronary ischemia, myocardial infarction, myocarditis, cardiomyopathy, etc. can lead to heart failure. 2, cardiac overload: seen in hypertension, aortic stenosis, pulmonary hypertension, pulmonary stenosis; heart valve closure insufficiency, left, right heart or arteriovenous shunt congenital cardiovascular disease such as septal defect, arteriovenous catheterization, etc.