If severe tricuspid regurgitation occurs, it is very dangerous. Because the tricuspid valve is the main valve connecting the right ventricle and the pulmonary artery, once the tricuspid valve regurgitation is severe, it means that the pulmonary artery high pressure is very high, and the danger of pulmonary artery crisis may occur at any time, and once this situation occurs, the patient may have a sudden death, so the tricuspid regurgitation is very dangerous. After the appearance of tricuspid regurgitation, it is necessary to go to the hospital in time to do cardiac color ultrasound examination. Through the examination of cardiac color ultrasound, it is possible to clarify the degree and location of severe tricuspid regurgitation, as well as the size of regurgitation. In addition, according to the cardiac function and pulmonary artery pressure assessed by the cardiac ultrasound, the next step of treatment will be decided, whether it is to use medication to reduce pulmonary pressure or to perform tricuspid valve replacement surgery.