Aortic stenosis (AS) is recognized as one of the most serious and common valve diseases globally, affecting millions, particularly as populations age. This progressive condition involves the narrowing of the heart’s aortic valve opening, severely restricting the blood flow necessary to supply the rest of the body.
Untreated, particularly when symptoms of aortic stenosis appear, the survival rate is extremely poor, often worse than many common cancers. At Phyathai Hospital, we combine world-class expertise with advanced technology to provide timely and comprehensive management of aortic stenosis, ensuring optimal outcomes and a higher quality of life for our international community of patients.
Key Takeaways
- Aortic Stenosis (AS) is a serious, progressive narrowing of the aortic valve with a poor prognosis if symptomatic and untreated.
- Aortic Stenosis is primarily caused by age-related calcification, congenital defects, or rheumatic fever.
- Key risk factors of aortic stenosis include advanced age and atherosclerotic conditions (e.g., high blood pressure, diabetes).
- Untreated severe AS risks major complications like Heart Failure, Arrhythmias, Stroke, and Sudden Death.
สารบัญบทความ
- What is aortic stenosis?
- Symptoms of aortic stenosis
- What causes aortic stenosis?
- What are the risk factors for aortic stenosis?
- Complications of aortic stenosis?
- How is aortic stenosis diagnosed?
- What are aortic stenosis treatments?
- Can aortic stenosis be prevented?
- Aortic stenosis at Phyathai Hospital
What is aortic stenosis?
Aortic stenosis is the narrowing of the aortic valve, which separates the left ventricle (lower left heart chamber) and the aorta (main artery). Normally, the tricuspid aortic valve opens fully with each heartbeat to ensure correct blood flow.
Aortic stenosis prevents the valve from opening completely, forcing the powerful left ventricle to work much harder to pump blood through the smaller opening. This strain increases pressure and can cause the left ventricle wall to thicken, reducing blood volume and potentially leading to heart failure if untreated. The severity of the obstruction determines the stage of the disease, ranging from mild to severe aortic stenosis.
Symptoms of aortic stenosis
Many people with aortic valve stenosis are asymptomatic for years, with noticeable aortic stenosis symptoms only appearing when blood flow is significantly restricted. This insidious onset, especially in the elderly, makes it a silent, life-threatening concern.
Symptoms typically manifest when the valve is critically narrowed, and the heart is strained. Signs of progression include chest pain or tightness, often with physical activity, reduced activity level, difficulty walking, shortness of breath, dizziness, or fainting after exertion.
A doctor often detects a distinctive aortic stenosis murmur, a sound indicating turbulent flow, upon listening to the heart. Recognizing these severe aortic stenosis symptoms and seeking prompt diagnosis is crucial to prevent permanent heart damage.
What causes aortic stenosis?
Understanding what causes aortic stenosis is vital for assessing risk and progression.
- Calcification : The most common etiology in adults, involving the age-related deposition of calcium and scarring on the valve flaps over time. Typically begins after age 60, with symptoms often appearing in the 70s or 80s.
- Congenital Heart Defect : A major cause, often resulting in earlier disease onset (e.g., in a patient’s fifties or sixties). Examples include a bicuspid aortic valve (two cusps instead of the normal three), which leads to early calcium buildup.
- Rheumatic Fever : A complication of untreated strep throat that can damage heart valves by causing scar tissue to form and narrow the opening. This is a form of nonrheumatic aortic valve stenosis.
What are the risk factors for aortic stenosis?
Risk factors for aortic valve stenosis include
- Older Age : The condition most frequently impacts older individuals due to calcium buildup on the valve, which begins usually after age 60.
- Heart Conditions Present at Birth: Having congenital defects, particularly a bicuspid aortic valve (two cusps instead of three), significantly increases the likelihood of developing stenosis earlier in life.
- Chronic Kidney Disease : Long-term kidney disease, indicated by a low Glomerular Filtration Rate (GFR), is strongly and inversely correlated with the severity of aortic valve calcification.
- Atherosclerotic Risk Factors : Lifestyle and metabolic conditions often associated with general heart disease, including diabetes, high cholesterol, and high blood pressure, contribute to the disease progression.
- Obesity and High BMI : A high Body Mass Index (BMI) is consistently found to be a significant risk factor (normal BMI for most adults is between 18.5 – 24.9), and the severity of calcified aortic valve stenosis is significantly related to patient BMI.
- Abnormal Mineral Levels : Higher average serum phosphorus and calcium levels have shown a statistically significant positive relationship with the severity of aortic valve calcification.
- Smoking : Smoking is generally a major risk factor for heart disease, and it has been found to correlate significantly with the severity of calcified aortic valve stenosis.
- Infections : Past infections that affect the heart, such as rheumatic fever or infective endocarditis, may predispose patients to future valve issues.
Complications of aortic stenosis?
Possible complications, categorized under general heart disease issues, include
- Heart Failure : The heart muscle strains severely trying to push blood through the narrowed opening, leading to left ventricular hypertrophy (thickening), which eventually weakens the heart’s pumping ability. This weakening can result in fluid backing up into the heart and flooding the lungs, a condition known as congestive heart failure.
- Irregular Heartbeats (Arrhythmias) : Severe valve stress can trigger abnormal heart rhythms, known generally as arrhythmia. One specific and serious type of arrhythmia that may occur is atrial fibrillation (AF), which is characterized by a rapid, fluttering heartbeat.
- Stroke and Blood Clots : The presence of heart disease and conditions like atrial fibrillation increase the risk of forming blood clots, which can lead to complications such as ischemic stroke or other forms of systemic thromboembolism.
- Endocarditis : The damaged valve can be more susceptible to infection, potentially leading to infective endocarditis.
- Sudden Death : In advanced phases, aortic stenosis can tragically cause sudden loss of consciousness or sudden death.
How is aortic stenosis diagnosed?
Key diagnostic and evaluative tests include
- Echocardiogram (Echo) : uses sound waves for live images to assess stenosis severity, blood flow, and heart muscle function.
- Transesophageal Echocardiography (TOE) : TOE may be used for more detail.
Other important tests include
- Electrocardiogram (ECG/EKG) : Measures electrical activity to detect heart disease or chamber enlargement due to AS strain.
- Exercise/Stress Tests : Monitors heart’s reaction to physical exertion, revealing symptoms and assessing blood pressure response.
- Cardiac CT Scan : Uses X-rays for detailed images, assessing aorta size and quantifying calcium buildup on the valve, especially for TAVI planning.
- Cardiac MRI Scan : Uses magnetic fields for detailed pictures, determining AS severity, measuring aorta size, and assessing for myocardial fibrosis.
- Cardiac Catheterization (Angiogram) : is less common for primary diagnosis but may be needed if non-invasive tests are inconclusive or to check for blocked coronary arteries before valve replacement surgery.
What are aortic stenosis treatments?
Aortic stenosis management is highly individualized based on severity and symptoms. Mild or asymptomatic AS requires regular monitoring. As no medication reverses AS, intervention, often valve replacement, is strongly indicated for symptomatic severe AS to prolong life and relieve symptoms.
Treatment options generally fall into the following categories
- Medical Management : Medications treat symptoms (e.g., lower blood pressure, prevent atrial fibrillation, remove excess fluid) but do not repair the faulty valve.
- Balloon Valvuloplasty : A catheter procedure to temporarily widen the valve. It is often a short-term ‘bridge’ for critically ill patients or used in children, as narrowing often recurs in adults.
- Aortic Valve Replacement (AVR) : The definitive treatment, replacing the damaged valve with a biological or mechanical one.
- Surgical AVR (SAVR): Traditional open-chest surgery, the gold standard for younger (<70) and low-risk patients, or those needing other heart interventions (e.g., coronary artery disease, multiple valve disease). Recovery is four to 12 weeks.
- Transcatheter AVR (TAVR/TAVI): Minimally invasive, via a catheter (usually through the groin), without open-chest surgery. Recommended for older (≥70) or intermediate-to-high-risk surgical patients. Recovery is much faster (sometimes days).
The choice between SAVR and TAVI is complex, made by a multidisciplinary Heart Team based on the patient’s age, surgical risk, overall health, anatomy, and long-term durability needs.
Can aortic stenosis be prevented?
While there is currently no medical cure to stop or significantly slow the progression of calcific aortic stenosis (AS), a healthy lifestyle and diligent management of chronic conditions may help prevent its onset or slow its deterioration, as AS shares risk factors with general atherosclerotic heart disease. Key preventative strategies include
- Adopting a heart-healthy diet.
- Engaging in regular physical activity (with limitations for diagnosed AS patients).
- Controlling chronic conditions like high blood pressure, diabetes, and high cholesterol.
- Cessation of tobacco use.
- Maintaining good dental hygiene.
- Promptly treating infections (e.g., strep throat) to prevent complications like rheumatic fever.
Aortic stenosis Care at Phyathai Hospital
If you or a loved one has symptoms like chest pain, breathlessness, or dizziness, especially with diagnosed moderate or severe aortic stenosis, prompt care is vital. Phyathai Hospital’s Cardiovascular Center offers comprehensive care for complex heart disease, with expert cardiac surgeons and cardiologists with more than 30 years of experience.
Recognized for superior heart surgery in Bangkok, we use advanced diagnostics (Echocardiogram, Stress Tests) to stage your aortic valve stenosis. We offer cutting-edge procedures like Transcatheter Aortic Valve Implantation (TAVI), a minimally invasive alternative to traditional open-heart surgery.
TAVI has been shown to provide better outcomes with lower complication and mortality rates than traditional surgery. Now increasingly used for patients over 70, the procedure offers results comparable to surgical repair but with faster recovery times and less patient anxiety due to the lack of surgical scars.
For international patients seeking the latest non-surgical options for severe aortic stenosis, we provide dedicated assistance and multilingual support in over 20 languages. Let us be your Heart Partner, every beat matters. We’re here to support every patient 24/7.
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References
- Aortic Stenosis Overview. (2020, October 26). American Heart Association. https://www.heart.org/en/health-topics/heart-valve-problems-and-disease/heart-valve-problems-and-causes/problem-aortic-valve-stenosis
- Lamprea‐Montealegre, J. A., & Otto, C. M. (2018). Health Behaviors and Calcific Aortic Valve Disease. Journal of the American Heart Association, 7(3). https://doi.org/10.1161/jaha.117.008385
- Mayo Clinic Staff. (n.d.). Aortic valve stenosis. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/aortic-stenosis/diagnosis-treatment/drc-20353145
