Small amounts of pulmonary regurgitation, caused by pulmonary valve insufficiency, are mainly seen in patients with coronary artery disease, heart failure, dilated cardiomyopathy, etc. When pulmonary valve insufficiency occurs, the patient will have symptoms of exertional dyspnea at the beginning, which is manifested as chest tightness, shortness of breath and dyspnea after a certain amount of labor, and when the condition further worsens, the amount of labor will gradually decrease, and in severe cases, dyspnea will occur even at rest and with a small amount of labor. In more severe cases, the patient may wake up at night, sit up and breathe, and be unable to lie down at night, or even cough up pink foamy sputum. The disease will gradually worsen, with a combination of cough, sputum, and intrapulmonary infection, which can also aggravate the cardiac symptoms of pulmonary valve insufficiency. At the same time, the patient may have edema, low urine output, difficulty in eating, poor feeding, nausea, vomiting and other symptoms.