Skip to Main Content
Ask About Financing

What is an atrioventricular heart block?: Diagnosis & Treatment

Heart block is when the electrical signals sent to your pet's heart from their brain aren't properly conducted from the top to the bottom of your companion's heart. This cardiac issue can be quite serious if not identified and addressed. Here, our vets explain what atrioventricular heart block is, its diagnosis, and the treatment for heart block in pets from Englewood and beyond.

What is a Heart Block?

Heart block, in general, is the delayed or absent conduction through the communication point between the upper and lower chambers of the heart (called the atrioventricular, or AV node). Essentially, the top of your pet's heart isn't properly conducting electrical signals from the brain to the bottom of their heart, affecting their heartbeat.

There are several types of heart block, including first-degree, second-degree, and third-degree (complete) heart block. However, the most serious forms are known as high-grade second-degree AV block and third-degree AV block.

The most common cause of these types of heart block is the buildup of fibrous tissue on your pet's heart that interferes with the conduction of brain signals through the AV node.

Other causes include electrolyte abnormalities, high resting nervous system tone (called high vagal tone), some medications, and inflammatory or infectious processes. Alterations in nervous influence are generally due to a secondary health condition like diseases of the nervous system, respiratory system, or gastrointestinal system and are not a primary cardiac issue.

How is Heart Block Diagnosed?

Most cases of heart block are diagnosed by performing an electrocardiogram (ECG). An ECG records conduction through the heart and therefore enables detection of the various types of heart block. In some cases, a specific test, called an “atropine response test” will be performed as well to confirm that the heart block is due to a cardiac cause. In cases of intermittent heart block, a Holter monitor (24-hour ECG monitor) may be recommended.

An echocardiogram may also be recommended depending on physical examination findings to assess heart structure and function.

How is Heart Block Treated?

If the heart block is due to a primary cardiac issue, then the treatment depends on the severity of the condition. If the heart block is causing symptoms (decreased energy level or fainting episodes), then the treatment of choice is to place a permanent pacemaker to control the heart rhythm and alleviate these symptoms.

If a permanent pacemaker is not an option, then medical management options can be considered. However, these are often less successful than pacemaker therapy.

If the heart block is due to a non-cardiac issue, treatment of the underlying disease process is recommended. In some cases, medical management of the heart rate might be necessary.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

Are you worried your dog or cat may be suffering from heart block? Interested in learning more about our treatment options? Contact VRCC Veterinary Specialty & Emergency Hospital to learn more about our services including cardiology.

New Patients Welcome

VRCC Veterinary Specialty & Emergency Hospital in Englewood is always accepting new patients! Our board-certified specialists and emergency veterinarians are passionate about restoring good health to Denver Metro area pets.

Contact Us

(303) 874-7387 Contact

Open Modal