Mild cardiac reflux refers to a small amount of blood reflux from the left ventricle into the left atrium during systole or from the right ventricle into the right atrium, and a small amount of blood reflux from the aorta into the left ventricle or from the pulmonary artery into the right ventricle during diastole. For mild reflux, most patients do not have symptoms of chest pain, chest tightness or panic, and the function of the left ventricle is often normal as indicated by cardiac ultrasound. The purpose of the follow-up is to see if the patient’s clinical symptoms have appeared or worsened, and to check whether there is progressive enlargement of the left ventricle and progressive decrease in the ejection fraction of the left ventricle, so as to assess the impact of mild cardiac regurgitation on the human body.