The criteria for judging mitral valve regurgitation mainly depend on the percentage of the regurgitation area in relation to the left atrial area. If the area of mitral regurgitation exceeds 40% of the left atrial area, it is medically termed as severe regurgitation. If it is below 20%, it is considered mild regurgitation. Generally, patients with severe regurgitation require surgical treatment. This treatment can be conducted through mitral valve replacement surgery or mitral valve repair surgery. Surgical treatment can effectively prevent the occurrence of heart failure, thereby improving the quality of life and extending the patient's lifespan.