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Doctor insights on: What Are Differences Between Left Bundle Branch Block And Right Bundle Branch Block

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What are differences between left bundle branch block and right bundle branch block?

What are differences between left bundle branch block and right bundle branch block?

The location: Obviously the location of the electrical block in the conduction of electric impulses from the atrium to the ventricles is different. The electrical signals travel to the two ventricles through the left and the right bundle, the left then bifurcates to two fascicles itself. In my experience, the non-pathologic presence of right bundle branch block is more common. ...Read more

Dr. Milroy Samuel
98 Doctors shared insights

Bundle Branch Block (Definition)

There are 2 main branches of the heart's electrical system within the ventricles, the right bundle branch and the left bundle branch. Additionally, the left bundle branch has two sub-branches, the antero-superior fascicle and the posteroinferior fascicle. When one or more branches are disrupted, the resultant electrical abnormalities can be ...Read more


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Hoping you can tell me, is right bundle branch block (rbbb) something to really stress over everyday?

Hoping you can tell me, is right bundle branch block (rbbb) something to really stress over everyday?

Not really: Rt bbb is a common ekg finding and it may occur in some medical conditions. But it is also common in some people with normal heart
it occurs in conditionsthat effect the right ventricle or the lungs. If you are otherwise healthy and no other symptoms and your doctor gave you clean chit, than you do not need to stress over it every day. ...Read more

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Would it be possible that a rbbb (right bundle branch block) cause a heart murmur?

Would it be possible that a rbbb (right bundle branch block) cause a heart murmur?

No: A rbbb is a pattern seen in the ECG where the electrical impulse is delay or interrupted as it spread along the heart. Prevalence increase with age. At 80 y/o close to 10% people can have it. Somewhat benign but an evaluation need to be done to r/o heart and lung conditions. Conditions like copd, cad, myocarditis, valvular heart disease, and other structural heart conditions. ...Read more

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Right bundle branch block and Z-pack (Azithromycin) prescribed for infection. Haven't taken yet, any concern for heart issues with RBBB and Azithro?

Right bundle branch block and Z-pack (Azithromycin) prescribed for infection. Haven't taken yet, any concern for heart issues with RBBB and Azithro?

BBB: ECG QT interval prolongation can be a concern with azithromycin, the bundle block adds to the measured QT interval, however the more relevant measure is the JT interval that ECG machines don't record/measure, consult locally with the prescribing physician. Also don't delay antibiosis with out the prescriber being aware. ...Read more

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Is left bundle branch block reversible?

Is left bundle branch block reversible?

Yes: It is sometimes seen intermittently. It can be present on an EKG and not on one done at a later date. At times it occurs when the heart is beating fast but not with slower heart rates. ...Read more

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How do you treat left bundle branch block?

How do you treat left bundle branch block?

Treatment of LBBB: There is no specific treatment for left bundle branch block. However, treatment is directed at the underlying cause of this conduction disturbance. ...Read more

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How can left bundle branch block be treated?

It isn't: Treated but factors contributing or causing may need to be...Talk to your physician. ...Read more

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What are causes of left bundle branch block?

What are causes of left bundle branch block?

Various causes: Left bundle branch block is a pattern seen on an EKG indicating an abnormal or different pathway of the electrical signal that causes the heart muscle to contract. It is most often due to an underlying medical condition such as hypertension, a heart attack, an enlarged heart from any cause and only when serious conditions are excluded is it felt due to the benign aging of the conduction pathway. ...Read more

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Is left bundle branch block life shortening?

Is left bundle branch block life shortening?

Possibly: As most people with LBBB have heart muscle abnormalities, yes. But about 15% of people with left bundle branch block have structurally normal hearts, so the answer is maybe or sometimes. ...Read more

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Will left bundle branch block cells regenerate?

Usually not: Left bundle branch block (lbbb) develops when 2/3 electrical "wires" in the heart stop working. Many patients can have LBBB and no sx. Lbbb usually reflects aging of the heart but can be seen in a variety of pathological heart conditions. Rarely, medicines which affect the speed of electrical conduction in the heart can cause LBBB which reverses. This technically not cellular regeneration. ...Read more

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What is left bundle branch block is characterized by?

What is left bundle branch block is characterized by?

Found on EKG: It is caused by a block in the "electrical wiring" of the heart which affects the appearance of the ekg. It most of the time indicates a significant problem with the heart but can at times be benign. ...Read more

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What occurs when someone has a left bundle branch block?

What occurs when someone has a left bundle branch block?

Nothing to severe: Left bundle branch block (lbbb) is a pattern on the ECG that indicates that the heart's electrical waves are following an unusual path. It is common in older age, and usually due to scarring of the pathway. It may cause no symptoms and need no therapy. It can lead to marked slowing that needs a pacemaker. A new LBBB can also be a sign of a heart attack. ...Read more

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If diagnosed with left bundle branch block & doing ok, will my insurance premiums be higher?

Can't answer...: No expert on insurance premiums (thank goodness) but LBBB is not a benign diagnosis or "normal" variant so despite your well compensated or normal feeling state of health the insurers may see it differently...Sorry. ...Read more

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What to do if I have a small left bundle branch block, will I be able to join the army as a 31b?

LBBB: LBBB is like pregnancy - You have it or you don't. You can't have a "small LBBB". (you could have an incomplete LBBB). Whether or not it disqualifies you would depend on the reason it's there, so you need a cardiac evaluation - usually consisting of, at least, an echocardiogram and stress test. ...Read more

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What is the difference between complete right bundle branch block and incomplete right bundle branch block?

What is the difference between complete right bundle branch block and incomplete right bundle branch block?

Duration: A complete right bundle branch block has a qrs duration of 120 milliseconds or more, an incomplete rbbb is less than 120 milliseconds. ...Read more

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Is there a cure for a left bundle branch block?

Cure?: "cure" suggests that LBBB is a disease but it is not. It is associated with underlying structural heart disease and that is what should be addressed. Lbbb causes no symptoms and it requires no treatment. ...Read more

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Can chemotherapy cause left bundle branch block?

Sometimes: A left bundle branch block is a finding on an EKG (the electrical tracing of your heart.) it shows that something has altered the way your heart conducts electrical impulses. Chemotherapy can do it, but so can heart disease. Your doctor should rule out other causes for a left bundle branch block before assuming chemotherapy is the cause. ...Read more