Hi stranger! Signing up for MypetMD is easy, free and puts the most relevant content at your fingertips.

Get Instant Access To

  • 24/7 alerts for pet-related recalls

  • Your own library of articles, blogs, and favorite pet names

  • Tools designed to keep your pets happy and healthy


or Connect with Facebook

By joining petMD, you agree to the Privacy Policy.

PetMD Seal

Heart Block or Conduction Delay (Left Anterior) in Dogs

Left Anterior Fascicular Block in Dogs

 

Left Anterior Fascicular Block (LAFB) is a heart problem that originates due to an abnormally functioning conduction system, which is responsible for generating electrical impulses (waves) that propagate throughout the musculature of the heart, stimulating the heart muscles to contract and pump blood. If the conduction system is affected, not only will contraction of the heart muscles be affected, but the timing and frequency of heartbeats too. Fortunately, this condition is uncommon in dogs.

 

Symptoms and Types

There are no specific symptoms related to this condition itself, rather, related to the underlying cause of the LAFB.

 

Causes

 

  • Heart surgery
  • Electrolyte abnormalities
  • Heart problems (e.g., ischemic cardiomyopathy, ventricular septal defect, aortic valvular disease, etc.)

 

Diagnosis

 

You will need to give a thorough history of your dog’s health, including the onset and nature of the symptoms. 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 may reveal electrolyte imbalances.

 

Electrocardiography, however, remains the most important tool for diagnosis. Your veterinarian will record your dog’s electrocardiogram (ECG) and compare it with a normal ECG to see if any abnormalities are present. Further evaluation of the heart is usually done with echocardiography. This helps in the diagnosis of underlying heart disease or problem, and the extent of heart involvement.

 

Your veterinarian will also take X-rays of both the thoracic and abdominal regions to see if there are any abnormal masses, tumor, foreign body, and/or abnormal heart position.

 

 

Treatment

 

The form of treatment recommended for your dog grossly depends on the diagnosis and may vary patient to patient. Therefore, correctly diagnosing the underlying cause of the LAFB is paramount.

 

Living and Management

 

Prognosis and follow-up exam schedules varies greatly depending on the underlying disease. However, in cases of severe or advanced heart problems or cancer, prognosis is not good. Consult with your dog's veterinarian in all cases.

 

 

Related Articles

Low Blood Oxygen in Dogs
When the brain is deprived of oxygen, irreversible damage may be the result, even...
READ MORE
Heart Block (Mobitz Type II) in Dogs
Second degree AV block in dogs is a disease in which the electrical conduction system...
READ MORE
Heart Disease of the Sinus Node in Dogs
The sinoatrial node (SA Node, or SAN), also called the sinus node, is the initiator...
READ MORE
  • Lifetime Credits:
  • Today's Credits:
Hurry Before All Seats are Taken!
Enroll
Be an A++ Pet Parent! Take fun & free courses to earn badges & certifications. Choose a course»
Search dog Articles

 

Latest In Dog Nutrition

How Antioxidants Improve Our Pet's Health, ...
The science behind pet nutrition continues to make major advances. One such example...
READ MORE
Five Life-Lengthening Health Tips for Your ...
Anyone who has ever had a dog or cat wishes just one thing — that he or she has a...
READ MORE
How Obesity May Shorten Your Pet's Lifespan
Obesity is a nationwide epidemic for our pets. Unfortunately, being obese can shorten...
READ MORE
Around the Web
MORE FROM PETMD.COM