Sick Sinus Syndrome (SSS) in Dogs

Overview of Sick Sinus Syndrome in DogsSick sinus syndrome (SSS) is a cardiac condition of unknown cause that affects the heart rate and rhythm of both humans and dogs. In this disease, the heart’s electrical impulse-generating sites (called sinuses) fail to function normally. As a result, dogs with this problem will be unable to maintain normal heart rates and many also suffer other changes in heart rhythm.This disease will vary in severity among dogs, with some suffering catastrophic failure to pump blood (when the heart rhythm is severely disturbed) while others can live perfectly normal lives.For more severely affected dogs the syndrome can be divided into two different classes of patients based on their abnormal heart rhythms: those for whom the rhythm varies from slow to fast (“bradycardia-tachycardia”) and those in which the rhythm is characterized by slowness and occasional stopping (“bradycardia and sinus arrest”).Sick sinus syndrome has been identified in older female Miniature Schnauzers, Dachshunds, Cocker Spaniels, West Highland White Terriers and Pugs, though other breeds have occasionally been diagnosed with it as well.

What to Watch For

A low heart rate (or another abnormal rhythm) is the most common finding, but some dogs will be diagnosed only after they’ve fainted (known as a “syncopal episode”) or had a seizure. Episodic weakness is also commonly associated with sick sinus syndrome. Sudden death is always a risk with these patients.

Diagnosis of Sick Sinus Syndrome in Dogs

Diagnosis of sick sinus syndrome is based on the history, physical examination as well as the following tests:

For all these cases, a veterinary cardiologist is the go-to veterinarian when it comes to diagnosing and treating this disease.

Treatment of Sick Sinus Syndrome in Dogs

Dogs who suffer symptoms of sick sinus syndrome are candidates for treatment. Others may not necessitate any treatment whatsoever.

Treatment options may include:

Veterinary Cost

The cost of diagnosis and pacemaker placement for sick sinus syndrome patients varies according to the facility and geographic location, but $5,000 to $15,000 is a fairly typical expenditure for affected dogs.

Those for whom this great expense is not assumable should know that some medical therapies are available, though they are by no means as reliable as the pacemaker approach and dogs may suffer significant side effects from their use. Typical costs run from $30-$100 a month for these drugs when used in small breed dogs. Pacemaker patients may also be best served by instituting these drug therapies, thereby increasing the long-term cost of the condition.