Mitral Stenosis

What is Mitral Stenosis?

Mitral stenosis is a condition where the mitral valve, which regulates blood flow between the left atrium and left ventricle, becomes narrowed and stiff. This restricts blood flow, causing the left atrium to work harder to pump blood into the left ventricle. Over time, increased pressure can lead to lung congestion, atrial fibrillation, and heart failure.

How Does Mitral Stenosis Affect the Heart?

• Increased Left Atrial Pressure: The left atrium struggles to push blood through the narrowed valve.
• Pulmonary Hypertension: Blood backs up into the lungs, leading to shortness of breath.
• Atrial Fibrillation: The heart's electrical system can be disrupted, causing irregular heart rhythms.
• Heart Failure: If left untreated, the condition can progress to heart failure.

Causes and Risk Factors

Several conditions can contribute to the development of mitral stenosis. The most common cause is rheumatic fever, which results from untreated streptococcal infections (such as strep throat or scarlet fever). Other causes include:

Primary Causes:

• Rheumatic Heart Disease: The most common cause, where repeated inflammation from rheumatic fever scars the valve.
• Congenital Mitral Stenosis: Some people are born with a defective mitral valve.
• Calcium Deposits: Aging can cause calcium buildup on the valve, restricting its movement.
• Radiation Therapy: Past radiation treatment to the chest can damage heart valves.
• Autoimmune Diseases: Conditions like lupus or rheumatoid arthritis can contribute to mitral valve damage.

Risk Factors:

• History of rheumatic fever or strep infections.
• Family history of heart valve disease.
• Older age (higher risk of calcium buildup on valves).
• Exposure to environmental toxins that affect heart function.

Symptoms of Mitral Stenosis

Mitral stenosis symptoms may develop gradually over several years. Some individuals may remain asymptomatic until the condition progresses.

Common Symptoms:

• Shortness of breath: Especially during exercise or lying down.
• Fatigue: Due to reduced oxygen circulation.
• Swelling in legs and feet: Caused by fluid buildup.
• Heart palpitations: Irregular heartbeats due to atrial fibrillation.
• Frequent respiratory infections: Recurring bronchitis or pneumonia.
• Chest discomfort: Tightness, pain, or pressure in the chest.
• Coughing up blood (hemoptysis): Due to increased lung pressure.

Symptoms tend to worsen during pregnancy, infections, or other illnesses due to increased heart workload.

Diagnosis of Mitral Stenosis

To diagnose mitral stenosis, a cardiologist will perform a physical exam and order diagnostic tests.

Common Diagnostic Tests:

• Stethoscope Exam: A heart murmur is often the first sign.
• Echocardiogram (Echo): Uses ultrasound to visualize valve narrowing.
• Electrocardiogram (ECG or EKG): Checks for irregular heart rhythms (AFib).
• Chest X-ray: Detects lung congestion and heart enlargement.
• Cardiac MRI or CT Scan: Provides detailed images of the mitral valve.
• Cardiac Catheterization: Measures blood flow pressure in the heart.

Treatment and Management

The treatment of mitral stenosis depends on the severity of symptoms and valve damage.

1. Lifestyle Modifications

• Low-sodium diet: Helps manage fluid retention and blood pressure.
• Regular exercise: Moderate physical activity is recommended.
• Avoiding excessive exertion: Reduces strain on the heart.
• Quit smoking & limit alcohol: Improves overall heart health.

2. Medications for Symptom Management

• Diuretics: Reduces fluid buildup and swelling.
• Beta-blockers: Slows heart rate and reduces workload.
• Anticoagulants (Blood thinners): Prevents blood clots in atrial fibrillation.
• Antiarrhythmic medications: Controls irregular heartbeat.

3. Surgical & Minimally Invasive Procedures

• Balloon Valvuloplasty (Balloon Commissurotomy): A catheter with a balloon is inserted to widen the narrowed valve.
• Mitral Valve Repair: Surgeons reshape or remove scar tissue to improve function.
• Mitral Valve Replacement: A severely damaged valve is replaced with a mechanical or biological prosthetic valve.