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 Bundle) in Cats

Left Bundle Branch Block (LBBB) in Cats

 

Left Bundle Branch Block (LBBB) is a defect in the heart’s electrical conduction system. It occurs when the left ventricle (one of the cat's four heart chambers) is not directly activated by the electric impulses through the left posterior and anterior fascicles of the left bundle branch, causing the deflections in the electrocardiographic tracing (QRS) to become wide and bizarre. LBBB may be complete or partial in nature.

 

Symptoms and Types

 

Often, no specific symptoms are seen that can be attributed to LBBB, only those that are related to the underlying disease causing the defect.

             

Causes

 

  • Cardiomyopathy
  • Cancerous tumors
  • Direct or indirect cardiac trauma (e.g., hit by car and cardiac needle puncture)
  • Narrowing just below the aortic valve, which supplies the body with oxygenated blood (subvalvular aortic stenosis)
  • Replacement of heart muscle with scar tissue (fibrosis)
  • Ischemic cardiomyopathy (i.e., hardening or thickening of the coronary arteries, death of heart muscle due to lack of oxygen)

 

Diagnosis

 

You will need to give a thorough history of your cat’s health, including the onset and nature of the symptoms, to the 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 non-specific.

 

Left bundle branch block is often only found accidentally, perhaps while performing an echocardiogram. In the case of this defect, he or she may identify structural defects in the heart without left-side enlargement. Thoracic and abdominal radiography may also show masses and other abnormalities, while Holter monitoring may reveal intermittent LBBB.

 

 

Treatment

 

Treatment is directed towards treating underlying cause.

 

Living and Management

 

This condition itself is not life-threatening and treating the underlying cause results in complete resolution of problem. However, if left untreated, LBBB can lead to more severe heart rhythm changes or even complete heart block.

 

You may be required to take your pet for regular follow-ups exams to evaluate the status of disease and the cat's response to treatment. No diet modifications are necessary, unless required to manage underlying condition.

 

 

Related Articles

Heart and Lung Diseases in Cats
Endomyocarditis, or inflammation of the inner heart muscle and lining, is an acute...
READ MORE
Congenital Heart Defect (Ebstein’s Anomaly...
Ebstein's anomaly is a rare congenital malformation of the heart in which the opening...
READ MORE
Heart Block (Mobitz Type II) in Cats
Second degree AV block in cats is a disease in which the above mentioned electrical...
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 cat Articles

 

 

PETMD POLL

What do you use to prevent ticks from feeding on your pet?

Around the Web
MORE FROM PETMD.COM