Pulmonic Stenosis in Dogs
Pulmonic stenosis is a congenital (present at birth) defect characterized by the narrowing and obstruction of blood through the heart's pulmonary valve, which connects the pulmonary artery to the right ventricle (one of the heart's four chambers). Depending on the severity of the obstruction, it can cause anything from a murmur to an arrhythmia to congestive heart failure.
The breeds most susceptible to this defect include the English bulldog, Scottish terrier, wirehaired fox terrier, miniature schnauzer, West Highland white terrier, Chihuahua, Samoyed, mastiff, cocker spaniel, boxer, and beagle.
Symptoms and Types
There are three types of pulmonic stenosis: valvular pulmonic stenosis (occurring in the valve), subvalvular pulmonic stenosis (occurring below the valve, and supravalvular pulmonic stenosis (just inside the pulmonary artery). Valvular pulmonic stenosis is the most common form seen in dogs.
If the stenosis is mild, no clinical symptoms may be present, whereas severely affected patients may collapse with exertion or suffer from congestive heart failure (CHF). Other visible signs of pulmonic stenosis include:
- Abdominal distention
- Difficulty breathing
- Inability to exercise normally
Congenital (present at birth).
You will need to give a thorough history of your dog’s health, including the onset and nature of the symptoms, to your veterinarian. He or she will then perform a complete physical examination, as well a biochemistry profile, urinalysis, and complete blood count (CBC) -- the results of which are typically normal. Some dogs may also be revealed to have polycthemia, a condition which causes an abnormally high number of red blood cells.
Other diagnositc procedures include thoracic X-rays (which may show heart enlargement), abdominal X-rays (which may show abnormal accumulation fluid in abdominal cavity (ascites), and echocardiography (which may show increase in size of right ventricle and other abnormalities related to ventricle). A more advanced version of echocardiography, Doppler Echocardiography, may be used to measure the speed of blood flow. Angiography, on the other hand, is an imaging technique used to visualize the inside of blood vessels and heart chambers, which can help identify the precise structural abnormalities before surgery.
The act of making an opening narrower.
Pertaining to the lungs
Pertaining to the chest
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
a) A cavity in certain animals b) Term refers to a rear chamber in the heart or a cavity in the brain
The prediction of a disease’s outcome in advance
The process of making something larger by dilating or stretching it
The collection of fluid in the peritoneal cavity.
A large blood vessel that transports blood out of the heart.
To make something wider
The widening of something
The space in the abdomen that holds the major digestive organs in an animal. Normally referred to as the area between the diaphragm and the pelvis. Also referred to as the peritoneal cavity.
A procedure that is used to evaluate the health and structures of the heart