What does mitral valve regurgitation of the heart mean?

　　Mitral regurgitation refers to the backflow of blood through the mitral valve. It occurs when the mitral valve does not close completely, allowing a small amount of blood to flow backward from the left ventricle into the left atrium. A detailed analysis is as follows:

　　Mitral regurgitation is one of the more common valvular heart diseases in clinical practice and may result from either congenital abnormalities or acquired conditions, such as leaflet damage, annular dilation, or coronary artery disease. During left ventricular contraction, the valve fails to close properly, causing part of the blood that has flowed from the left atrium into the left ventricle to regurgitate back into the left atrium. This leads to a series of pathological changes in the heart and associated clinical symptoms. If severe, it may even lead to heart failure.

　　Patients with mitral regurgitation may experience symptoms such as shortness of breath after physical activity, palpitations, and orthostatic syncope. Because acute mitral regurgitation can progress rapidly, individuals should seek immediate medical attention whenever symptoms like dyspnea or palpitations occur, regardless of severity. For patients with chronic mitral regurgitation or those who develop mitral regurgitation during pregnancy, if they begin to experience exertional dyspnea or paroxysmal nocturnal dyspnea—even if previously asymptomatic—they are advised to seek medical care as early as possible.