What is heart failure? What are the reasons and manifestations?

Heart failure, referred to as heart failure, refers to a group of clinical syndromes caused by various heart diseases, such as cardiac systolic and diastolic dysfunction or overload, which reduces cardiac output and cannot meet the needs of tissue metabolism, leading to venous congestion and arterial ischemia. Heart failure is often accompanied by passive congestion of pulmonary circulation and/or systemic circulation, so it is also called congestive heart failure. Heart failure can be divided into acute and chronic according to the occurrence process; According to clinical manifestations, it can be divided into left heart failure, right heart failure and heart failure; According to the absolute or relative decrease of cardiac output, it can be divided into low output heart failure and high output heart failure. This disease can be classified as palpitation, asthma and edema in traditional Chinese medicine.