Mitral Stenosis

Mitral stenosis is a narrowing of the mitral valve, which sits between the heart’s left atrium and left ventricle. This narrowing makes it harder for blood to move forward into the left ventricle, so pressure can build up behind the valve. Rheumatic disease is a common cause in many parts of the world, while age-related calcium buildup and congenital valve problems are other possible causes. Some people have few symptoms at first, but breathing problems and reduced stamina can develop as the valve becomes more restricted.

Mild mitral valve stenosis may cause no noticeable symptoms. Symptoms can become clearer during exercise, pregnancy, an infection, or an irregular heart rhythm, and they may gradually worsen as blood flow becomes more restricted.

Scarring, thickening, or fusion of the mitral valve leaflets can reduce the valve opening and obstruct blood flow from the left atrium to the left ventricle. Calcium deposits can also stiffen the valve or the ring around it. This narrowing is different from mitral incompetence, also called mitral regurgitation, in which the valve leaks instead of opening too narrowly.

Risk factors for mitral valve disease include age, previous rheumatic fever or rheumatic heart disease, congenital valve abnormalities, prior chest radiation, and inflammatory conditions. Living in or having close connections to regions where rheumatic fever remains common can also increase the likelihood of rheumatic disease. Prompt treatment of streptococcal throat infections can help prevent rheumatic fever and later valvular stenosis.

Complications are more likely when the valve opening becomes severely narrowed or symptoms are not treated. Pressure rising behind the valve can cause congestion in the lungs and eventually strain the right side of the heart. The risk depends on the valve’s structure and blood flow measurements, not symptoms alone.

Diagnosis begins with a review of symptoms and medical history, followed by a physical examination for a murmur or another abnormal heart sound. Tests then show the valve’s anatomy, how well it opens, and how blood flows through the heart. Echocardiography is the main test for confirming mitral stenosis and grading its severity.

Mitral stenosis treatment depends on the degree of narrowing, symptoms, valve anatomy, clot risk, heart rhythm, and overall health. Mild or symptom-free disease may be monitored, while medicines can manage fluid buildup, rhythm problems, or clot risk but usually cannot open the narrowed valve. Intervention is considered when stenosis is severe, symptomatic, or causing heart or lung complications.

Balloon Mitral Valvotomy

During balloon mitral valvotomy, a catheter-mounted balloon is guided to the mitral valve and inflated to widen a suitable narrowed opening. It may benefit people whose valve anatomy is favorable and who do not have a clot or other finding that makes the procedure unsafe. Recovery is generally shorter than recovery from open surgery, but bleeding, valve leakage, rhythm problems, clot-related events, or other complications are possible. Follow-up is needed to check whether the valve remains open and whether narrowing returns. Medicines may be used alongside or instead of a procedure to control fluid retention, rhythm problems, or clot risk.

Mitral Valve Repair or Replacement Surgery

Surgery may be considered when the valve is severely damaged, balloon treatment is unsuitable or unsuccessful, or symptoms and heart or lung effects remain significant. Repair preserves the person’s valve by separating fused areas or correcting damaged tissue when possible; replacement removes the valve and inserts a mechanical or tissue valve. Recovery usually takes longer than catheter treatment and includes activity restrictions and cardiac follow-up. A mechanical replacement generally requires lifelong anticoagulation, while tissue valves may have different durability and medication considerations.

Mitral stenosis may remain stable for years but can progress, particularly after rheumatic damage or significant calcification. The outlook depends on the degree of narrowing, symptoms, heart rhythm, lung pressure, and complications. Prognosis is generally better with regular monitoring, treatment of rhythm or clot risks, and timely valve intervention when it is indicated.

Arrange a medical appointment for unexplained shortness of breath, reduced exercise tolerance, persistent fatigue, palpitations, or swelling in the legs or ankles. You should also seek evaluation if you have a history of rheumatic fever or known valve disease. If you have been diagnosed with mitral stenosis, keep scheduled cardiology visits so changes can be detected and treated.