What Is Aortic Stenosis? How Cardiologists Diagnose and Treat a Narrowing Heart Valve

What Is Aortic Stenosis?

Aortic stenosis is a condition where the aortic valve in the heart becomes narrowed and doesn't open fully. This valve sits between the left ventricle (the main pumping chamber) and the aorta (the body's largest artery). When the valve leaflets thicken or stiffen, blood flow out of the heart is restricted. Over time, this extra pressure can strain the heart, leading to symptoms and complications.

Why It Matters

• The left ventricle must work harder to pump blood through the narrowed valve.
• Untreated severe aortic stenosis can lead to heart failure, irregular heart rhythms, or sudden cardiac events.
• Early detection and treatment can improve quality of life and long-term outcomes.

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Causes and Risk Factors

Aortic stenosis can develop for different reasons. Common causes include:

• Calcific (Degenerative) Stenosis
  Calcium deposits build up on the valve leaflets, most common in people over 65.

• Bicuspid Aortic Valve
  A congenital condition where the valve has two leaflets instead of three. Symptoms may appear earlier in adulthood.

• Rheumatic Fever
  Rare in developed countries, but prior infection can scar the valve leaflets.

Risk factors that increase the chance of developing aortic stenosis:

• Age over 65
• High blood pressure
• High cholesterol
• Diabetes
• Smoking
• Family history of valve disease

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Signs and Symptoms

In early stages, aortic stenosis may have no noticeable symptoms. As it progresses, common symptoms include:

• Chest Pain (Angina):
  A feeling of pressure or tightness, especially during exertion.
• Shortness of Breath:
  Difficulty breathing during activity or when lying flat.
• Dizziness or Fainting (Syncope):
  Especially with exertion, due to reduced blood flow to the brain.
• Fatigue:
  General tiredness, even with mild activity.
• Heart Palpitations:
  Awareness of an irregular or rapid heartbeat.

If you're experiencing any of these symptoms, you can quickly assess your risk using Ubie's free AI-powered Aortic Stenosis (AS) symptom checker to help determine whether you should consult a cardiologist.

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How Cardiologists Diagnose Aortic Stenosis

Diagnosing aortic stenosis involves a combination of medical history, physical exam, and imaging tests.

1. Medical History and Physical Exam

• Listening for a Murmur:
  A characteristic "harsh, crescendo-decrescendo" sound heard with a stethoscope.
• Check for Signs of Heart Strain:
  Swelling in legs, signs of fluid overload, or irregular pulse.

2. Echocardiography (Echo)

The key test for aortic stenosis. It uses ultrasound to visualize the valve and measure:

• Valve area
• Pressure gradient across the valve
• Heart chamber size and function

Types of Echo:

• Transthoracic Echocardiogram (TTE): Standard, non-invasive.
• Transesophageal Echocardiogram (TEE): More detailed images via a probe in the esophagus.

3. Electrocardiogram (ECG)

Assesses heart rhythm and detects signs of left ventricular hypertrophy (thickening).

4. Chest X-Ray

May show:

• Enlarged heart
• Calcification of the aortic valve
• Changes in the lung fields

5. Cardiac MRI or CT Scan

Provides detailed images when echo results are unclear or to plan for interventions.

6. Cardiac Catheterization

An invasive test reserved for:

• Confirming severity when non-invasive tests conflict
• Assessing coronary arteries before valve replacement

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Grading Severity

Aortic stenosis severity guides treatment decisions. It's graded as:

• Mild:
  Valve area >1.5 cm², mean gradient <20 mm Hg
• Moderate:
  Valve area 1.0–1.5 cm², gradient 20–40 mm Hg
• Severe:
  Valve area <1.0 cm², gradient >40 mm Hg

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Treatment Options

1. Watchful Waiting (Mild to Moderate)

• Regular follow-up with echocardiograms (every 6–12 months).

• Lifestyle adjustments:

  • Moderate exercise as tolerated
  • Heart-healthy diet (low in sodium, saturated fats)
  • Avoiding tobacco

• Medications to manage:

  • High blood pressure
  • High cholesterol
  • Irregular heartbeats

2. Medications

No drugs can reverse stenosis, but medications help control symptoms:

• Diuretics: Reduce fluid buildup and ease breathing.
• Beta-Blockers or Calcium Channel Blockers: Manage heart rate and blood pressure.
• Statins: Control cholesterol (no clear benefit on valve progression).

3. Valve Replacement or Repair

When aortic stenosis becomes severe or symptoms appear, cardiologists recommend valve intervention.

A. Surgical Aortic Valve Replacement (SAVR)

• Open-heart surgery to remove the diseased valve and replace it with:
  • Mechanical valve (durable, requires lifelong anticoagulation).
  • Biological (tissue) valve (less durable, usually no lifelong blood thinners).

Pros:

• Proven long-term durability.
• Excellent symptom relief.

Cons:

• Longer recovery.
• More invasive.

B. Transcatheter Aortic Valve Replacement (TAVR)

• Minimally invasive catheter-based procedure.
• A new valve is delivered via a blood vessel (usually the femoral artery).

Pros:

• Shorter hospital stay.
• Faster recovery.
• Option for patients at high surgical risk.

Cons:

• Durability still under study (improving each year).
• Risk of pacemaker requirement post-procedure.

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After Treatment: Recovery and Follow-Up

• Regular Cardiology Visits:
  Check valve function and heart health with periodic echos.
• Blood Thinner Management:
  If you receive a mechanical valve, you'll need lifelong anticoagulants.
• Lifestyle and Rehabilitation:
  Cardiac rehab programs can help rebuild stamina and confidence.
• Watch for Symptoms:
  New or recurring symptoms—shortness of breath, chest pain, dizziness—should prompt medical attention.

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Living with Aortic Stenosis

• Stay Active:
  Engage in moderate exercise approved by your cardiologist.
• Nutrition:
  Focus on lean proteins, whole grains, fruits, vegetables, and low sodium.
• Monitor Blood Pressure:
  High blood pressure can worsen valve strain.
• Dental Hygiene:
  Good oral care reduces the risk of infective endocarditis (rare but serious).

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When to Seek Help

Aortic stenosis can be progressive. Speak to a doctor if you notice:

• New or worsening chest discomfort
• Increasing shortness of breath
• Dizziness or fainting spells
• Sudden swelling in legs or feet

Any sudden or severe symptoms could signal a serious event. Always reach out to healthcare professionals right away.

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Aortic stenosis is a manageable condition when detected early and treated appropriately. Regular check-ups, lifestyle measures, and timely intervention can help you maintain an active, fulfilling life. If you're concerned about your heart health, don't wait—use Ubie's free AI-powered Aortic Stenosis (AS) symptom checker to evaluate your symptoms in just a few minutes and be sure to speak to a doctor about any worrisome or life-threatening symptoms.