Coarctation of the aorta

Aortic stenosis (Aortic stenosis)

1) Disease description (causes and symptoms)

• Definition: A condition in which the aortic valve or the area around the valve becomes narrowed when blood is pumped from the left ventricle into the aorta, restricting blood flow.
• Pathophysiology: Increased resistance to left ventricular ejection due to valve stenosis → left ventricular pressure overload → reactive left ventricular hypertrophy (symmetrical, concentric hypertrophy) → long-term decline in left ventricular relaxation and contraction, resulting in heart failure and myocardial ischemia.
• Main causes: Congenital (bicuspid aortic valve), valve calcification (senile), rheumatic valvular disease (rare), genetic syndromes (e.g., Williams syndrome). In many cases, no clear cause is identified.
• Main symptoms: Often asymptomatic. When symptoms are present, they may include shortness of breath during exercise (a sign of advanced heart failure), chest pain (similar to angina), syncope (especially during activity), fatigue, and growth delay (in children). Prognosis may worsen rapidly once symptoms develop.

2) Treatment methods and precautions

• Diagnostic evaluation: Echocardiography is essential (assessment of valve area, flow velocity and pressure gradient, left ventricular function, and associated abnormalities). If necessary, cardiac catheterization (accurate pressure measurement), electrocardiography, chest X-ray, CT (assessment of calcification and anatomy), and blood tests (preoperative evaluation) may be performed.
• Medication: Does not directly correct valve stenosis. Used to relieve heart failure symptoms (diuretics, and, when necessary, cautious use of vasodilators and beta-blockers). Symptomatic treatment and optimization before surgery.
• Procedures and surgery
  • Balloon valvuloplasty (BPV): Used as initial treatment in neonates and infants or as emergency or bridging treatment in patients at high surgical risk. Restenosis may occur depending on the degree of leaflet malformation or calcification.
  • Surgical aortic valve replacement (SAVR): Replacement of the valve (mechanical valve or tissue valve). Mechanical valves require lifelong anticoagulation (warfarin), while tissue valves may require replacement again. In children and young patients, the Ross procedure (transplantation of the pulmonary valve to the aortic position) may be selected.
  • Transcatheter aortic valve implantation (TAVI/TAVR): A major alternative for older adults and adults at high surgical risk. Selection depends on anatomical indications (such as the location of calcification and the aortic access route) and overall health status.
• General indications for surgery: Severe symptomatic aortic stenosis, or severe aortic stenosis with reduced left ventricular function regardless of whether symptoms are present. Reference indicators of severe valvular stenosis include a mean pressure gradient of ≥40 mmHg, a peak velocity of ≥4.0 m/s, or a valve area of ≤1.0 cm2 on echocardiography. (Assessment must be based on the individual patient's circumstances.)
• Prevention of complications and precautions
  • Patients with prosthetic valves or a history of infective endocarditis may require antibiotic prophylaxis to prevent infective endocarditis during dental treatment and similar procedures (follow the doctor's instructions).
  • Patients with mechanical valves require lifelong anticoagulation management (warfarin)—regular INR monitoring and attention to drug and food interactions.
  • When symptoms are present, avoid strenuous physical activity and severe dehydration or hypovolemia (which increase the risk of syncope).
  • Regular follow-up echocardiography (monitor changes in severity even before symptoms develop).

3) Checklist before an outpatient visit (items to bring and records, etc.)

• Items to bring: A list of all medications currently being taken (name, dose, and time of administration); if taking an anticoagulant, the most recent INR record; previous echocardiography, cardiac catheterization, CT, or surgical records (reports, if possible); history of allergies (medications and contrast media); identification and insurance card.
• Symptom records: Circumstances when shortness of breath has recently occurred (level of exertion and duration), chest pain (onset, duration, and characteristics), episodes of syncope or weakness, and weight changes (rapid increase).
• Lifestyle history: Smoking and alcohol use, exercise capacity (e.g., whether shortness of breath occurs when climbing stairs), and pregnancy plans (for women).
• Other: Measuring and recording blood pressure, heart rate, and weight for several days can help with diagnosis and management.
• Important information to tell the healthcare provider at the outpatient visit: Recent infections (especially dental or upper respiratory infections), a tendency to bleed, supplements and anticoagulants currently being taken, and a history of surgery or anesthesia.

4) Examples of general questions to ask the doctor

• "How severe is my valve stenosis? (How should the echocardiography values be interpreted?)"
• "Given my current condition, which treatment is recommended among surgery, TAVI, and balloon valvuloplasty? Why?"
• "What risks and complications can be expected from the treatment, and how long will the recovery period take?"
• "If I need a prosthetic valve, when should I start taking an anticoagulant, and for how long will I need to take it?"
• "What should I be careful about regarding daily life, exercise, and pregnancy planning?"

5) Examples of disease-specific questions

• "I (or my child) have only mild symptoms, but the pressure gradient (or valve area) on echocardiography is relatively severe. Why do you recommend surgery right now?"
• "I am elderly and have systemic diseases. Is TAVI suitable instead of SAVR, and what is the long-term prognosis after TAVI (restenosis, regurgitation, and valve-related complications)?"

If you would like, you can also provide your individual test results (echocardiography values, symptom patterns, etc.), and I can help organize a more specific explanation and a list of questions useful for consultation.