According to the American New York Heart Association’s cardiac function classification, there are a total of four grades instead of five. 1. Heart Function Class I: Patients are in the compensatory stage of heart function, can do daily physical activities without physical limitation, and will not have complications such as dyspnea, palpitations, and weakness. 2. Cardiac function class II: the patient is in mild heart failure, heart function is slightly limited, no symptoms when resting, and the above complications may occur during daily activities. 3. Heart Function Class III: moderate heart failure with marked limitation of physical activity, no symptoms at rest, even though non-daily activities or physical labor lighter than daily life may cause complications such as dyspnea. 4. Cardiac function class IV: in severe heart failure, unable to engage in any physical activity, any physical activity can be seen after the worsening of symptoms, even at rest can be seen angina or congestive heart failure. It is recommended to consult a doctor in time and standardize the treatment under the doctor’s guidance.