Acute heart failure is also called acute heart failure. The most common is acute pulmonary edema caused by acute left heart failure. Heart failure is defined as cardiac systolic and diastolic dysfunction caused by different causes, which develops to the point where cardiac output cannot meet the blood flow needs of systemic metabolism when the circulating blood volume and vasomotor function are normal, resulting in a clinical syndrome characterized by abnormal hemodynamics and activation of the neurohormonal system. Among them, heart valve disease, coronary artery sclerosis, hypertension, endocrine diseases, bacterial toxins, acute pulmonary infarction, emphysema or other chronic lung diseases can all cause heart disease and produce manifestations of heart failure. Pregnancy, fatigue, rapid intravenous rehydration, etc. can increase the burden on the diseased heart and induce myocardial failure.