Aortic valve disease
Why in News?
Transcatheter Aortic Valve Implantation/Replacement (TAVI/TAVR) is a minimally invasive procedure that replaces a diseased aortic valve using a catheter, avoiding open-heart surgery. It enables faster recovery, reduced complications, and is especially beneficial for elderly or high-risk patients with severe aortic stenosis.
What is Aortic Valve Disease?
- Anatomy: The aortic valve is one of the four main valves in the human heart. It is situated between the left ventricle (the main pumping chamber) and the aorta (the body's primary blood vessel).
- Function: It features leaf-like flaps (cusps) that open to allow oxygen-rich blood to exit the heart and close tightly to prevent blood from leaking backward.
- The Disease: Aortic valve disease occurs when this specific valve does not function correctly, placing extra strain on the heart muscle.
Main Types of Aortic Valve Disease
- Aortic Stenosis: The valve flaps become thick, stiff, or calcified, causing the valve opening to narrow. This restricts or obstructs normal blood flow out to the body.
- Aortic Regurgitation (Insufficiency): The valve flaps do not close tightly. This allows blood to leak backward into the left ventricle instead of moving forward, forcing the heart to pump harder.
Key Symptoms
In early stages, the disease is often asymptomatic. As it progresses, symptoms include:
In early stages, the disease is often asymptomatic. As it progresses, symptoms include:
- Shortness of breath (dyspnea), particularly during physical activity or when lying flat.
- Unusual fatigue and lack of energy.
- Chest pain, pressure, or tightness during exertion.
- Dizziness, lightheadedness, or fainting (syncope).
- Irregular heartbeats or palpitations.
- Fluid retention leading to swollen ankles, legs, or feet.
- Note for children: Poor feeding and inadequate weight gain are primary indicators in infants.
Primary Causes & Risk Factors
- Age-Related Calcification: Natural wear-and-tear as people age can cause calcium deposits to build up on the valve.
- Congenital Heart Defects: Being born with an abnormal valve structure, such as a bicuspid aortic valve (two leaflets instead of the normal three).
- Rheumatic Heart Disease: Caused by untreated strep throat or rheumatic fever during childhood, which scars the heart tissue later in life.
- Infections: Endocarditis, an infection of the heart's inner lining and valves.
- Cardiovascular Risks: Chronic kidney disease, high blood pressure, diabetes, smoking, and high cholesterol.
Diagnosis and Treatment
- Diagnosis: Doctors typically detect a characteristic heart murmur using a stethoscope. The condition is officially confirmed via an echocardiogram (ultrasound of the heart), alongside tools like cardiac CT scans, ECGs, or cardiac catheterization.
- Medical Management: Mild forms are carefully monitored through routine imaging and blood pressure control medications. However, medications cannot reverse mechanical valve damage.
- Surgical Interventions: Severe cases require structural intervention:
- Surgical Aortic Valve Replacement (SAVR): Traditional open-heart surgery using mechanical or biological tissue valves.
- TAVI / TAVR: A highly preferred, minimally invasive catheter-based treatment route for older, frail, or high-risk patients, yielding rapid recovery times.
