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Pulmonary Stenosis in Children

Valvular, Subvalvular, and Supravalvular Right Ventricular Outflow Obstruction

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Çocuk Sağlığı ve Hastalıkları department. Book Appointment →

What is Pulmonary Stenosis in Children?

Pulmonary stenosis (PS) refers to congenital narrowing of the right ventricular outflow tract at the valvular (most common, 80–90%), subvalvular, or supravalvular level, resulting in right ventricular pressure overload.

Valvular PS commonly involves doming, dysplastic, or bicuspid pulmonary valve; dysplastic valves are characteristic of Noonan syndrome.

Severity is classified by peak Doppler gradient: mild (<36 mmHg), moderate (36–64 mmHg), and severe (>64 mmHg) on transthoracic echocardiography.

Often associated with other congenital heart defects (tetralogy of Fallot, double-outlet right ventricle) and syndromes (Noonan, Williams, Alagille, congenital rubella).

Symptoms

Mild PS: typically asymptomatic, detected by murmur on routine examination
Moderate to severe PS: exertional dyspnea, fatigue, decreased exercise tolerance
Cyanosis in critical PS or PS with right-to-left atrial shunt (PFO/ASD)
Right-sided heart failure signs in severe long-standing disease: hepatomegaly, peripheral edema, jugular venous distension
Syncope or sudden cardiac death rare but reported in severe untreated PS
Auscultation: ejection click (decreases with inspiration in valvular PS), systolic ejection murmur at left upper sternal border, widely split S2 with delayed P2 in severe disease

Risk Factors

Genetic syndromes: Noonan syndrome (PTPN11, SOS1, RAF1 mutations) — present in 25–50% of cases with dysplastic valves
Williams-Beuren syndrome (supravalvular PS), Alagille syndrome (peripheral pulmonary stenosis)
Maternal congenital rubella syndrome (peripheral pulmonary artery stenosis)
Family history of congenital heart disease
Maternal diabetes, phenylketonuria, or teratogen exposure (lithium, valproate)
Trisomy 21 (less commonly than other CHDs) and other chromosomal abnormalities

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Newborn with cyanosis or heart murmur
  • Child with exertional dyspnea, fatigue, or decreased exercise tolerance
  • Asymptomatic murmur detected on routine pediatric examination
  • Known PS with new symptoms: chest pain, syncope, worsening exercise tolerance
  • Children with syndromes associated with PS for cardiac screening (Noonan, Williams, Alagille)

Treatment Methods

01
Mild PS: clinical observation with periodic echocardiography every 2–5 years; no exercise restrictions; endocarditis prophylaxis no longer routinely recommended unless other indications
02
Moderate to severe PS: percutaneous balloon pulmonary valvuloplasty is the first-line treatment, with excellent immediate and long-term results in typical valvular PS (success >85%)
03
Surgical pulmonary valvotomy or valvuloplasty for dysplastic valves (less responsive to balloon), supravalvular or subvalvular obstruction, or when associated lesions require open repair
04
Pulmonary valve replacement (homograft, bioprosthesis, or transcatheter Melody/Sapien valves) for late progressive pulmonary regurgitation after relief of stenosis
05
Critical neonatal PS: prostaglandin E1 infusion to maintain ductal patency, urgent balloon valvuloplasty in catheterization lab, and consideration of patent ductus arteriosus stenting
06
Long-term follow-up: lifelong cardiology surveillance, exercise testing, monitoring for residual stenosis or progressive regurgitation, and pulmonary valve replacement timing per Brown criteria
07
Genetic counseling and screening when syndromic etiology suspected; family screening for Noonan and similar inherited cardiomyopathies
08
Patient and family education on activity restrictions during severe disease, signs of decompensation, and adherence to scheduled imaging

Which Department to Visit?

You can visit our Çocuk Sağlığı ve Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.