Heart function and heart failure indices are usually assessed using the cardiac index. The cardiac index is the amount of blood ejected from the heart per minute, which is the heart’s output per beat multiplied by the number of heartbeats per minute. The lower the cardiac index, the more severe the heart failure. Cardiac ejection fraction and B-type natriuretic peptide are more commonly used in clinical practice. 1. Cardiac ejection fraction: It refers to the percentage of blood volume ejected from the left ventricle during each contraction of the left ventricle, and this value can be calculated by cardiac ultrasound, and the normal value is between 50 and 70%. If the ejection fraction is lower than 50%, there is cardiac insufficiency, and the lower the ejection fraction, the worse the cardiac function. 2. B-type natriuretic peptide: it is a peptide hormone synthesized and released by cardiomyocytes, and is secreted more when the atrial wall is pulled. Its normal value range is 0-100ng/ml, below 100ng/ml can rule out acute heart failure, below 35ng/ml can rule out chronic heart failure, greater than 400ng/ml can be sure that there is heart failure. The prognosis can be judged by the degree of its decline after treatment. When patients have exertional dyspnea, lower limb edema and other manifestations of cardiac insufficiency, it is necessary to go to the hospital in a timely manner to clarify the diagnosis and the degree of cardiac insufficiency, and according to the condition of the patient to choose the appropriate treatment plan to start treatment as soon as possible, so as not to delay the condition.