Valvular heart diseases

Valvular heart disease (VHD) comprises a group of conditions that affect the heart valves. Valvular defects are either acquired or congenital and manifest as stenosis and/or insufficiency (regurgitation) of the valves. Acquired defects, which are primarily found in the left heart, are the most common form of VHD and often occur secondary to infections (postinflammatory), degenerative processes, or underlying heart disease. The type of valvular disease determines the type of cardiac stress and subsequent symptoms. Valvular stenosis leads to a greater pressure load and concentric hypertrophy, while insufficiencies are characterized by volume overload and eccentric hypertrophy of the preceding heart cavities. Diagnostic procedures typically include ECGs, chest x-ray, and echocardiograms. Management consists of medical therapy for symptoms (e.g., due to heart failure) as well as interventional or surgical procedures to repair, reconstruct, or replace valves.

• Aortic stenosis
  • Most common valve defect in industrialized countries
  • Mostly degenerative
  • Degenerative stenosis usually becomes symptomatic after the age of 75 and is most common in men.
  • Aortic stenosis in young people is usually secondary to congenital defects (e.g., bicuspid aortic valve).
• Aortic regurgitation
  • Age of onset: 40–60 years
  • Severity increases with age
• Mitral stenosis: symptom onset between 20 and 39 years ^[1]
• Mitral regurgitation
  • Overall prevalence of 0.6 to 2.4 %
  • Second most common valve defect
  • More common in women
• Tricuspid valve defects: occur in < 1% of the population
• Pulmonary valve defects: rare outside of congenital conditions

Epidemiological data refers to the US, unless otherwise specified.

Valvular heart defects may either be acquired or congenital. Acquired defects are more common and typically occur secondary to infections (postinflammatory), degenerative processes, or heart disease.

All valvular defects can eventually lead to symptoms of heart failure as a result of excessive strain on the ventricles.

Physical examination

• Complete heart examination: see cardiovascular examination and auscultation of the heart for details.

References:^[4][5]

This section provides a general overview of various management strategies for valvular heart diseases (VHDs). See the respective articles on aortic stenosis, aortic regurgitation, mitral stenosis, and mitral regurgitation for the management of acutely decompensated VHD, and for further details on the management of chronic VHD.

Approach ^[6]

• Perform a thorough initial evaluation, including TTE and assessment of symptoms and comorbidities.
• Consider the need for advanced studies to identify symptom etiology and further characterize valvular lesions.
• Classify the disease according to severity.
• Refer patients with indications for interventional treatment (e.g., those with severe and/or symptomatic VHD):
  • Valve repair vs. prosthetic heart valve replacement
  • Surgical vs. transcatheter approach
• Refer patients without indications for valve intervention at diagnosis to a cardiologist for monitoring.
• Offer supportive care to all patients.

Acutely decompensated VHD (e.g., presenting as cardiogenic shock, acute heart failure, or acute arrhythmia symptoms) requires urgent management and cardiology consultation.

The approach to management depends on the type and severity of VHD, the patient's individual risk profile (e.g., comorbidities, age, and fitness level), evaluation of risks and benefits of each procedure, and shared decision-making.

Minimum diagnostic workup ^[6]

• ECG: to assess cardiac rhythm and check for signs of ventricular hypertrophy
• TTE: to assess cardiac structure, valve morphology, and hemodynamics
• Consider chest x-ray to assess for pulmonary congestion or lung pathology.

Advanced studies ^[6]

• Transesophageal echocardiography (TEE): for more precise estimations of valve anatomy and/or to identify possible complications
• Cardiac MRI: to assess for structural heart disease
• Cardiac catheterization: to assess valve hemodynamics and cardiac pressures
• Exercise stress testing: Consider in patients with unclear symptom history.

Classification ^[6]

• Valvular disease is classified into four stages (A-D) depending on the severity of disease.
• Classification is based on:
  • Presence of symptoms
  • Valve anatomy and hemodynamics
  • Effects on cardiac chambers and pulmonary circulation (e.g., LVEF, chamber dilation, right ventricular function)
• For more information, see:
  • AHA staging for aortic valve stenosis
  • AHA staging for chronic aortic valve regurgitation
  • AHA staging for mitral valve stenosis
  • AHA staging for mitral valve regurgitation

Supportive care ^[6]

• Screen for and manage other traditional atherosclerotic cardiovascular disease risk factors.
• Manage complications, e.g., treatment of heart failure.
• Consider indications for endocarditis prophylaxis before procedures that may cause bacteremia.
• Secondary prevention of rheumatic fever if indicated (see “Prevention” in “Acute rheumatic fever”)
• Prevention of thromboembolism if indicated (e.g., anticoagulant therapy after heart valve replacement)

Monitoring for disease progression ^[6]

Monitor all patients without indications for intervention at diagnosis.

• Repeat patient history and physical examination annually.
• Obtain TTE follow-up at fixed intervals depending on the type and severity of valve defect.
• Consider advanced studies and/or referral for valve intervention depending on findings.

Valve repair ^[6]

• Valve reconstruction
  • Annuloplasty ^[7]
    • A ring-shaped device is attached to the outside of the valve opening to reestablish the shape and function of the valve.
    • Commonly used to treat mitral valve regurgitation ^[8]
  • Leaflet repair: involves the use of a clip device; may be performed in patients with mitral valve regurgitation
• Valvuloplasty
  • A procedure performed in patients with valvular stenosis (e.g., aortic valve stenosis or mitral stenosis) to separate fused or calcified valve leaflets.
  • Approach
    • Percutaneous balloon valvuloplasty: A balloon is advanced into the target valve (either transfemorally or transapically) and inflated, opening the stenotic valve.
    • Open commissurotomy: open surgical procedure to separate fused and/or calcified leaflets

Prosthetic heart valve replacement ^[6]

The choice of mechanical vs. bioprosthetic valve replacement should be based on shared-decision making, patient age and preference, presence of comorbidities (e.g., conditions that increase the patient's surgical risk), and ability to take anticoagulation.

Replacement route

The approach depends on the type of valve (e.g., mechanical vs. bioprosthetic) and the patient's surgical risk.

• Surgical heart valve replacement: may be done in conjunction with a CABG in suitable patients who require both procedures
• Transcatheter aortic valve replacement (TAVR)
  • A minimally invasive, percutaneous procedure that utilizes an endovascular technique to replace the aortic valve.
  • A collapsible replacement valve is inserted via a catheter and placed over the native valve.
  • Once the replacement valve is expanded, it displaces the old valve and assumes its function.
• Transcatheter mitral valve replacement

Complications of heart valve intervention ^[6][9]

• Patient-prosthesis mismatch
  • Caused by implantation of a prosthetic valve with a functional area that is too small for the cardiac demand of the patient
  • Leads to left ventricle hypertrophy and impaired exercise capacity
  • Increased risk of other cardiac events (e.g., arrhythmia, MI) and increased mortality
• Prosthetic valve thrombosis ^[10][11]
  • Etiology
    • Mechanical valves are more prone to thrombosis than biological prosthetic valves.
    • Ιnsufficient anticoagulatory therapy after valve replacement
  • Clinical features
    • Signs of acute heart failure due to valve dysfunction (e.g., dyspnea, fatigue, peripheral edema)
    • New murmur consistent with valve obstruction and/or regurgitation
    • Thromboembolic event (e.g., TIA)
  • Diagnostics
    • First-line imaging: transthoracic or transesophageal echocardiography ^[11]
    • If echocardiography is negative: cardiac CT to assess leaflet anatomy and motility
  • Treatment: anticoagulation and fibrinolysis, surgical valve replacement
• Prosthetic valve dysfunction: e.g., paravalvular leak
• Prosthetic valve stenosis or regurgitation: Clinical presentation is similar to native valve disease.
• Cardiac complications: e.g., prosthetic valve endocarditis, heart failure, pericarditis, high-grade AV block, atrial fibrillation ^[6]
• Vascular complications: e.g., bleeding, femoral artery dissection, hemolytic anemia in patients with a mechanical valve , thromboembolism ^[6]
• Other: e.g., stroke, acute kidney injury

Preoperative risk assessment ^[6]

• Prior to any valve procedure, preoperative testing includes:
  • Coronary angiography to assess coronary anatomy
  • CT imaging
  • Dental examination to assess the risk of infection
• Additional evaluations may be required prior to open surgery: Refer for preoperative testing for high-risk surgery.

Post-procedure follow-up ^[6]

• Monitor patients for recurrent or persistent symptoms and complications of heart valve intervention.
• Obtain TTE to evaluate valve and cardiac function.
  • 1–3 months after valve procedure ^[6]
  • At fixed intervals thereafter depending on type of valve replacement

Anticoagulant therapy after heart valve replacement ^[6]

• Mechanical valve replacement
  • Lifelong anticoagulation with a vitamin K antagonist (VKA) to a target INR ^[6]
  • Bridging anticoagulation is recommended when VKA is interrupted (e.g., for surgery) for patients with:
    • Aortic valve replacement and additional risk factors for thromboembolism
    • Mitral valve replacement
• Biological valve replacement
  • Anticoagulation with VKA for 3–6 months after intervention
  • Low-dose aspirin after discontinuing VKA can be beneficial.
  • In patients with atrial fibrillation and a bioprosthetic valve replacement > 3 months prior, a non-vitamin K oral anticoagulant (NOAC) may be considered based on the CHA₂DS₂-VASc score.

Insufficient anticoagulation increases the risk of thromboembolism, while excessive anticoagulation with VKA increases bleeding risk significantly. In patients with a mechanical valve and uncontrollable hemorrhage, anticoagulation reversal may be indicated.