There are several methods of staging chronic heart failure, the most commonly used clinically is the New York Classification of Cardiac Function, which is mainly divided into 4 levels, as follows: 1. Grade I means that general physical activity is not limited, and there is no shortness of breath, shortness of breath, etc.; 2. Grade II means that the general condition can only be significantly limited by heavy physical activity, and there is basically no significant shortness of breath in daily activities; 3. After grade III, it is equivalent to lighter Class IV is even more serious, meaning that there will be panic and shortness of breath at rest; therefore, the New York Heart Function Classification is a common classification method for chronic heart failure. Now in the United States, according to the new disease development status, it can be further divided into A, B, C, D. In fact, grade III and IV, which are equivalent to grade C and D in A, B, C, D grading, are as follows: 1. For stage A, it means that the patient has some susceptibility factors, such as hypertension, diabetes, coronary artery disease, but now there is no structural change of the heart, and there is no performance of heart failure; 2. has structural changes in the heart, such as enlarged heart, valvular disease, wind heart disease, but at this time the patient still has no clinical manifestations of heart failure; 3, stage C refers to the beginning of obvious clinical manifestations of heart failure, which is equivalent to the New York cardiac function grading stage III and IV mentioned earlier; 4, grade D refers to the conventional treatment is less effective, is a refractory heart failure, requiring more advanced This is called refractory heart failure stage D. So these are the two classifications used in clinical practice now.