Pulmonic Valve Disease¶
Chapter 278 | Part 6: Disorders of the Cardiovascular System
KEY CLINICAL POINTS¶
- Pulmonic stenosis is primarily congenital, with rare acquired causes including carcinoid tumors, endocarditis, and annular enlargement.
- Severe pulmonic stenosis is defined by a peak systolic gradient >64 mmHg (mean >35 mmHg) with Doppler jet velocity >4 m/s.
- Pulmonic regurgitation (PR) results from primary valve disease, annular dilation, or post-procedure complications, leading to RV dilation and dysfunction.
- Diagnosis relies on echocardiography (TTE/TEE) and cardiac catheterization for gradient measurement and anatomical assessment.
- Treatment for severe PS includes percutaneous valvuloplasty or surgery, while PR management focuses on addressing underlying causes and managing symptoms.
1. DEFINITION & OVERVIEW¶
Pulmonic valve disease encompasses stenosis (obstruction) and regurgitation (insufficiency) of the pulmonic valve. Pulmonic stenosis is predominantly congenital, while regurgitation may arise from structural abnormalities, annular dilation, or post-procedural complications. The condition is classified by hemodynamic severity and etiology.
Table 278-1 Causes of Pulmonic Valve Disease¶
| VALVE LESION | ETIOLOGIES |
|---|---|
| Pulmonic stenosis | Congenital, carcinoid tumor, endocarditis |
| Pulmonic regurgitation | Primary valve disease, annular enlargement, post-procedural complications |
1.1 Pulmonic Stenosis¶
Defined by a systolic pressure gradient between the right ventricle (RV) and main pulmonary artery (PA). RV hypertrophy (RVH) develops due to sustained outflow obstruction. Severe cases present with exertional dyspnea, fatigue, and syncope.
1.2 Pulmonic Regurgitation¶
Results from primary valve pathology, annular enlargement, or post-procedural changes. Severe PR causes RV dilation, elevated jugular venous pressure, and right heart failure.
2. EPIDEMIOLOGY¶
Pulmonic stenosis is congenital, with isolated cases typically presenting in infancy. Pulmonic regurgitation is more common in adults with congenital heart disease (e.g., tetralogy of Fallot) or acquired conditions like carcinoid syndrome. Risk factors include Noonan syndrome, Marfan syndrome, and chronic pulmonary hypertension.
2.1 Incidence/Prevalence¶
Congenital pulmonic stenosis is a common congenital heart defect, while acquired pulmonic regurgitation is associated with structural heart disease or surgical interventions.
2.2 Demographics¶
Pulmonic stenosis predominantly affects males. Pulmonic regurgitation is more prevalent in adults with prior surgical repairs (e.g., tetralogy of Fallot) or carcinoid syndrome.
3. ETIOLOGY & PATHOPHYSIOLOGY¶
Pulmonic stenosis is congenital, with valve malformations (e.g., domed valve, dysplasia). Acquired causes include carcinoid tumor, endocarditis, and annular dilation. Pulmonic regurgitation arises from valve leaflet dysfunction, annular enlargement, or post-procedural changes. Pathophysiology involves RV pressure overload, RVH, and progressive dysfunction.
3.1 Pulmonic Stenosis¶
Hemodynamic obstruction causes RV hypertrophy and prolonged ejection. Severe cases lead to RV dilation, reduced cardiac output, and systemic symptoms.
3.2 Pulmonic Regurgitation¶
PR increases RV preload and afterload, leading to chamber enlargement, diastolic dysfunction, and progressive right heart failure.
4. CLINICAL FEATURES¶
Mild/moderate pulmonic stenosis is often asymptomatic. Severe cases present with exertional dyspnea, fatigue, angina, and syncope. Pulmonic regurgitation causes fatigue, peripheral edema, and signs of right heart failure (e.g., elevated JVP, hepatomegaly).
4.1 Symptoms¶
Severe stenosis: exertional dyspnea, fatigue, syncope. Severe PR: fatigue, peripheral edema, abdominal distension.
4.2 Physical Findings¶
Mid-systolic ejection murmur (PS), Graham Steell murmur (PR), RV lift, and elevated JVP. P2 is diminished or absent in PS.
5. DIFFERENTIAL DIAGNOSIS¶
Pulmonic stenosis must be differentiated from aortic stenosis and other congenital heart defects. Pulmonic regurgitation should be distinguished from tricuspid regurgitation and other causes of right heart failure.
5.1 Pulmonic Stenosis¶
Differentiate from aortic stenosis (LV vs. RV hypertrophy), mitral valve disease, and other congenital defects.
5.2 Pulmonic Regurgitation¶
Distinguish from tricuspid regurgitation, chronic pulmonary hypertension, and RV dysfunction due to other etiologies.
6. INVESTIGATIONS & DIAGNOSIS¶
Diagnosis relies on echocardiography (TTE/TEE) for anatomical assessment and Doppler to measure gradients. Cardiac catheterization is used for definitive gradient measurement. Chest x-ray shows poststenotic PA dilation.
Pulmonic Stenosis Gradient Classification¶
| Severity | Peak Gradient (mmHg) | Doppler Jet Velocity (m/s) |
|---|---|---|
| Mild | <36 | <3 |
| Moderate | 36–64 | 3–4 |
| Severe | >64 | >4 |
6.1 Diagnostic Tests¶
Echocardiography (TTE/TEE) for valve morphology, jet velocity, and RV function. Cardiac catheterization for gradient measurement and procedural planning.
6.2 Imaging¶
Chest x-ray: poststenotic PA dilation. CMR for detailed anatomical assessment in complex cases.
7. MANAGEMENT & TREATMENT¶
Mild stenosis requires monitoring. Moderate/severe cases undergo percutaneous valvuloplasty or surgery. PR management focuses on addressing underlying causes (e.g., PA hypertension) and surgical valve replacement in severe cases.
7.1 Pulmonic Stenosis¶
Percutaneous balloon valvuloplasty for moderate/severe cases. Surgery for dysplastic valves (e.g., Noonan syndrome).
7.2 Pulmonic Regurgitation¶
Treat PA hypertension with vasodilators. Surgical valve replacement for carcinoid/endocarditis-related PR. Transcatheter valve replacement in post-repair patients.
8. PROGNOSIS & COMPLICATIONS¶
Mild stenosis has excellent prognosis. Severe cases without treatment may progress to RV failure. Complications include syncope, arrhythmias, and progressive right heart failure.
8.1 Prognosis¶
Early intervention improves outcomes. Untreated severe stenosis leads to progressive RV dysfunction and mortality.
8.2 Complications¶
RV failure, arrhythmias, thromboembolism, and infective endocarditis in prosthetic valves.
9. SPECIAL CONSIDERATIONS¶
Pregnancy in patients with pulmonic stenosis requires close monitoring due to increased cardiac workload. Pediatric patients with tetralogy of Fallot may develop severe PR post-repair. Carcinoid syndrome requires multidisciplinary management.
9.1 Pregnancy¶
Increased risk of RV failure; anticoagulation and fetal monitoring required.
9.2 Pediatrics¶
Post-repair PR in tetralogy of Fallot patients may require surgical intervention.
10. KEY POINTS & CLINICAL PEARLS¶
- Mild pulmonic stenosis is asymptomatic; severe cases require intervention.
- Pulmonic regurgitation is often secondary to structural heart disease.
- Echocardiography is the cornerstone of diagnosis.
- Percutaneous valvuloplasty is preferred for moderate/severe stenosis.
- Transcatheter valve replacement is emerging for post-repair PR.