Pulmonary Stenosis
A narrowing that limits blood flow from the heart to the lungs
Quick Facts
- Type: Heart valve / congenital heart condition
- What it is: Narrowing of the path to the lungs
- Usual cause: Present from birth (congenital)
- Treatment: Often a balloon procedure or surgery
Overview
Pulmonary stenosis is a narrowing of the pathway that carries blood from the right side of the heart to the lungs, most often at the pulmonary valve. This valve normally opens to let blood flow toward the lungs to pick up oxygen. When it is narrowed, the heart's right lower chamber (the right ventricle) must work harder to push blood through.
Pulmonary stenosis is usually a congenital condition, present from birth, and is one of the more common congenital heart problems. It may occur on its own or as part of a more complex heart defect. Severity ranges widely: mild cases often cause no symptoms and need only monitoring, while more severe narrowing strains the heart and requires treatment to relieve the obstruction.
Symptoms
Mild pulmonary stenosis often causes no symptoms and may be found only when a doctor hears a heart murmur. More significant narrowing can cause:
- Shortness of breath, especially with exertion
- Fatigue and reduced ability to exercise
- A fluttering or pounding heartbeat
- Chest discomfort
- Dizziness or fainting
- In severe cases in infants: poor feeding, rapid breathing, or a bluish tinge to the skin
Fainting, severe shortness of breath, or a bluish color to the lips or skin are warning signs that need urgent medical attention. In a newborn, poor feeding, fast breathing, or blue coloring is an emergency.
Causes
Pulmonary stenosis is most often congenital, developing as the heart forms before birth. The exact cause is usually unknown.
- Congenital narrowing: The pulmonary valve or the area just above or below it forms too narrow.
- Part of a complex defect: It can occur with other congenital heart conditions.
- Genetic conditions: It is more common in some genetic syndromes, including Noonan syndrome.
- Acquired causes: Rarely, narrowing develops later in life, for example after certain infections or tumors near the heart.
Risk Factors
- Other congenital heart defects
- Certain genetic conditions, such as Noonan syndrome
- A family history of congenital heart disease
- Some infections during pregnancy that affect heart development
Diagnosis
Diagnosis often begins when a doctor hears a heart murmur and is confirmed with imaging.
- Echocardiogram: The main test, an ultrasound of the heart that shows the narrowing, how severe it is, and how the right ventricle is coping.
- Electrocardiogram (ECG): To look for signs of strain on the right side of the heart.
- Chest X-ray: To assess the heart and lungs.
- Cardiac catheterization: Sometimes used to measure pressures precisely and, in many cases, to treat the narrowing at the same time.
Treatment
Treatment depends on how severe the narrowing is and whether it is causing symptoms or straining the heart.
- Monitoring: Mild pulmonary stenosis often needs only periodic check-ups, as it may not worsen and may not require any procedure.
- Balloon valvuloplasty: For many cases of significant valve narrowing, a catheter with a balloon is used to widen the valve; this is the usual first treatment and avoids open surgery.
- Surgery: Used for narrowing that cannot be treated with a balloon or when other heart defects need repair.
- Follow-up: Ongoing cardiology care to watch for re-narrowing or valve leakage over time.
Many people, including those treated in childhood, do well with appropriate care and follow-up.
Prevention
Because pulmonary stenosis is usually congenital, it generally cannot be prevented. The focus is on detection and follow-up:
- Prompt evaluation of a heart murmur or relevant symptoms
- Good prenatal care, which can reduce some risks to heart development
- Lifelong cardiology follow-up after treatment to detect re-narrowing or valve problems early
When to See a Doctor
See a doctor if you or your child has shortness of breath with activity, unusual fatigue, palpitations, or a known heart murmur that has not been evaluated. Seek emergency care immediately for:
- Fainting or collapse
- Severe shortness of breath
- A bluish color to the lips, tongue, or skin
- In a newborn: poor feeding, rapid breathing, or blue coloring
Frequently Asked Questions
What is pulmonary stenosis?
Pulmonary stenosis is a narrowing of the path that carries blood from the heart to the lungs, usually at the pulmonary valve. It makes the right side of the heart work harder to push blood through and is most often present from birth.
Does pulmonary stenosis always cause symptoms?
No. Mild pulmonary stenosis often causes no symptoms and is found only when a doctor hears a heart murmur. More severe narrowing can cause shortness of breath, fatigue, palpitations, or fainting.
How is pulmonary stenosis treated?
Mild cases are often just monitored. Significant valve narrowing is frequently treated with balloon valvuloplasty, a catheter procedure that widens the valve without open surgery. Surgery is used for cases a balloon cannot treat.
Is pulmonary stenosis serious?
It can range from mild and harmless to severe enough to strain the heart. Mild cases may never need treatment, while severe narrowing requires a procedure. Lifelong follow-up helps detect any later valve problems.
When is pulmonary stenosis an emergency?
Seek emergency care for fainting, severe shortness of breath, or a bluish color to the lips or skin. In a newborn, poor feeding, rapid breathing, or blue coloring needs immediate attention.
References
- American Heart Association. Pulmonary Valve Stenosis.
- Mayo Clinic. Pulmonary valve stenosis.
- MedlinePlus, U.S. National Library of Medicine. Pulmonary valve stenosis.
- Centers for Disease Control and Prevention (CDC). Congenital Heart Defects.