What Is Pulmonic Stenosis?
Pulmonic stenosis (PS) is a congenital heart defect in which the pulmonic valve, the valve between the right ventricle and the artery to the lungs, is narrowed, thickened, or partly fused. The right ventricle has to push harder to move blood through it, and over time that wall of the heart thickens. Along with subaortic stenosis and patent ductus arteriosus, it is one of the most common inborn heart defects in dogs. It is uncommon in cats.
Breeds at higher risk include English Bulldogs, French Bulldogs, Boxers, Beagles, Chihuahuas, Miniature Schnauzers, Samoyeds, and several terrier breeds.
Why it matters
Mild pulmonic stenosis often causes no problems for life. Severe cases can lead to fainting, abnormal rhythms, and right-sided heart failure, so knowing the grade early shapes the plan.
Signs Owners Notice
- Often none; a heart murmur found at a puppy check is the usual first clue
- Tiring quickly or not keeping up on walks
- Fainting or collapse with exercise or excitement
- A swollen belly from fluid build-up in advanced right-sided heart failure
Diagnosis and Treatment
An echocardiogram (heart ultrasound) with Doppler confirms PS and measures the pressure difference across the valve, which grades it as mild, moderate, or severe. Chest X-rays and an ECG may be added.
- Monitoring only for most mild cases, with repeat scans as advised
- Beta-blockers, such as atenolol, may be used in moderate to severe cases to ease the load on the heart
- Balloon valvuloplasty, a catheter procedure that stretches the valve open, is often recommended for severe PS and can greatly improve the outlook
- Extra imaging in bulldogs, since some have an abnormal coronary artery that changes whether balloon treatment is safe
Practical Tips for US Pet Owners
- If you are getting an at-risk breed, ask whether the parents had a cardiologist exam (OFA cardiac clearance).
- Ask for a cardiology referral if your puppy has a murmur that doesn’t fade by about 16 weeks.
- Keep a note of any fainting episodes, including what your dog was doing, to share with your vet.
- Find cardiology-capable and referral practices through veterinary clinic listings.
When to see a vet
Book a heart workup for any murmur or unusual tiredness in a young dog. Seek emergency care for collapse, labored breathing, a rapidly swelling belly, or pale or blue gums.
Key Takeaways
- Pulmonic stenosis is an inherited narrowing of the valve leading from the heart to the lungs.
- An echocardiogram grades severity, and severity drives the outlook.
- Many mild cases live normal lives; severe cases may benefit greatly from balloon valvuloplasty.
FAQ
Is pulmonic stenosis the same as pulmonary stenosis?
Yes. Both names describe the same narrowing at the pulmonic valve.
Can dogs with PS exercise?
Dogs with mild PS usually can. With moderate or severe PS, ask your vet or cardiologist about safe activity levels.
Should dogs with PS be bred?
No. Because it is inherited, affected dogs should not be used for breeding.