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This condition can be hereditary and certain breeds are found to be more prone to developing it. Your dog’s heart rate may decrease or increase to a dangerous level and the symptoms can wax and wane over time. The number one symptom noticed is your dog fainting (syncope).
This syndrome gets its name from the sinus node which initiates your dog’s heartbeat not working properly, causing his irregular heartbeat. There are many other conditions that can have an irregular heartbeat as a symptom and it may difficult for you to determine if your dog’s symptoms have an underlying cause.
Sick sinus syndrome goes by a few names including sinus node dysfunction and bradycardia-tachycardia syndrome. It is defined as abnormalities in the typical rhythm of older and adult dog's heart beats.
Symptoms are mostly generalized, however, there are a few more specific ones to be aware of. Some of these symptoms may only be detected by your veterinarian.
The 2 types of sick sinus syndrome are bradycardia and tachycardia. These are based on how slow or how quick his heart rate is.
There are a few possible causes for sick sinus syndrome and these include inheritance in certain breeds, and age of your dog. Female dogs are more susceptible to developing the syndrome and it is most often found in dogs that are 6 years old or above.
Breeds most prone, although any dog is susceptible:
Age is a factor:
If you are concerned that your dog is possibly suffering from sick sinus syndrome, it will be very important to get him to his veterinarian as soon as possible as this syndrome can be life-threatening if left untreated. Once at his veterinarian, your dog will most likely be given a physical exam and any symptoms you have noticed should be brought to the veterinarian’s attention.
It will be important to share if you noticed him fainting or losing consciousness or if you noticed a quick heart rate with no justification for it. Your veterinarian will want to perform some testing to determine the exact cause of your dog’s symptoms. Some of these tests included in the diagnosis will include electrocardiograph, echocardiogram, blood pressure and x-rays.
The hallmark treatment option is placing a permanent pacemaker. This standard practice is the only proven way to ensure no ongoing issues for your dog. Some medications can be trialed, however there are not any medications that have been found to be effective in the long run. Without treatment, your dog can lose his life as the syndrome is life-threatening.
Your dog will be back on his feet relatively quickly after surgery. Your veterinarian will discuss any follow up appointments as necessary with you following treatment. When treatment is implemented quickly, his prognosis will be good. In up to 90% of dogs treated with surgery and pacemaker implantation, symptoms completely disappear.
Ongoing follow up to ensure there are no further heart beat problems or concerns will be necessary for the remainder of his life. It will also be important to bring him in regularly for checkups of his pacemaker.
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