Asked by: Atocha Cortacans
medical health heart and cardiovascular diseases

What does a left bundle branch block indicate?

Last Updated: 24th March, 2020

A left bundle branch block usually is a sign of an underlying heart disease, including dilated cardiomyopathy, hypertrophic cardiomyopathy, high blood pressure, aortic valve disease, coronary artery disease and other heart conditions. While left bundle branch block can appear in healthy people, it most often does not.

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Besides, how serious is a left bundle branch block?

Left bundle branch block can reflect damage to the left ventricle caused by high blood pressure, a heart attack, a failing aortic valve, coronary artery disease, heart failure, or other cardiac conditions. If a bundle branch block is causing symptoms, then the problem may be severe enough to require a pacemaker.

Similarly, what does left bundle branch block mean on ECG? Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.

Consequently, can a left bundle branch block go away?

The prevalence of left bundle branch block (LBBB) increases with advancing age in the general population. Unfortunately LBBB is not reversible. In your case, in the absence of any structural heart disease and symptoms, the overall risk of cardiovascular morbidity or mortality should be very low.

What is the treatment for bundle branch block?


  • A pacemaker. If you have bundle branch block and a history of fainting, your doctor might recommend a pacemaker.
  • Cardiac resynchronization therapy. Also known as biventricular pacing, this procedure is similar to having a pacemaker implanted.

Related Question Answers

Zhan Valet


Can you live a normal life with LBBB?

In young and healthy people, left bundle branch block is rare. This condition seems to have little effect on how long you live if you have no other underlying heart problems. You may not need any treatment at all, . especially when you have no other disease affecting your heart.

Eukene Lastre


Can left bundle branch block cause heart attack?

The main complication of bundle branch block, right or left, is to progress to a complete block of the electric conduction from the upper chambers of the heart to the lower. This can slow your heart rate, which can cause fainting and lead to serious complications and abnormal heart rhythms.

Karlota Laburu


Is left bundle branch block hereditary?

Most cases of heart block are not genetic and are not considered progressive familial heart block. The most common cause of heart block is fibrosis of the heart, which occurs as a normal process of aging. Other causes of heart block can include the use of certain medications or an infection of the heart tissue.

Zhongmin Balahowski


Which is worse right or left bundle branch block?

This prospective study demonstrated that men with left bundle branch block showed both a much higher risk for developing high degree atrioventricular block and a markedly higher hazard ratio for all-cause mortality than individuals with right bundle branch block.

Tenesor Ruppach


Is left bundle branch block genetic?

Is there a genetic predisposition to develop LBBB? Data from inherited diseases. of the His bundle. mutations in SCN5A, SCN1B and TRPM4 have been identified as the causal genes of inherited progressive cardiac conduction disease.

Lidong Groht


Is LBBB considered heart disease?

Most people with left bundle branch block have some form of underlying heart disease. The most common cardiovascular disorders found in the setting of LBBB include hypertension, CAD, heart failure, hypertrophic cardiomyopathy, or valvular heart disease.

Naira Corte


Can you have surgery with a bundle branch block?

These data suggest that the presence of BBB does not significantly increase the likelihood of cardiac complications following surgery, but that patients with LBBB may not tolerate the stress of perioperative noncardiac complications.

Mammie Mayer


What heart block feels like?

First-degree heart block often does not cause symptoms. It may be detected during a routine electrocardiogram (ECG/EKG), but the patient's heart rate and rhythm are usually normal. Symptoms of second- and third-degree heart block include fainting, dizziness, fatigue, shortness of breath and chest pain.

Mohand Cross


What medication is given for heart block?

Medication Summary
Common drugs that induce atrioventricular (AV) block include beta-blockers, calcium channel blockers, antiarrhythmics, and digoxin. Withdrawal of the offending drugs is the first treatment for heart block.

Sadrac Anzizu


What does a left bundle branch block look like?

A simple way to diagnose a left bundle branch in an ECG with a widened QRS complex (> 120 ms) would be to look at lead V1. If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present. With the faster heart rate, the QRS complex morphology changes to that of a LBBB.

Jovanka Ewig


Can left bundle branch block cause AFIB?

Background: Left bundle branch block (LBBB) is associated with atrial fibrillation (AF) and systolic heart failure, which can be treated with cardiac resynchronization therapy (CRT) that includes an implantable cardiac device (ICD).

Vasiliki Sagales


Can LBBB cause chest pain?

Background: Intermittent left bundle branch block (LBBB) has been linked to chest pain, and causes cardiac memory electrocardiographic (ECG) changes mimicking ischemia. Purpose: To present a case of chest pain with ECG abnormalities suggestive of ischemia, both likely caused by LBBB.

Mansoor Liddell


Can a stress test show a blockage?

A normal stress test result only shows that there is not a significant coronary artery blockage. For example, a nuclear stress test may be inaccurate if someone has severe blockages in all three main coronary arteries. The test looks for differences in blood flow between areas of the heart.

Chadwick Galena


Are beta blockers contraindicated in left bundle branch block?

Professor Dollery: A beta receptor blocking drug should not be used in anybody who has complete block and only very cautiously in the presence of bundle branch block. Minor conduction defects do not appear to be contraindications to beta blockade.

Roselle Berrozpe


Can stress cause heart block?

If stress itself is a risk factor for heart disease, it could be because chronic stress exposes your body to unhealthy, persistently elevated levels of stress hormones like adrenaline and cortisol. Studies also link stress to changes in the way blood clots, which increases the risk of heart attack.

Bader Gilissen


How is a bundle branch block diagnosed?

A bundle branch block can be diagnosed when the duration of the QRS complex on the ECG exceeds 120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex and may shift the heart's electrical axis slightly to the right.

Yusef Garchitorena


Where is the left bundle branch located?

There are two branches of the bundle of His: the left bundle branch and the right bundle branch, both of which are located along the interventricular septum. The left bundle branch further divides into the left anterior fascicles and the left posterior fascicles.

Hamido Stelmach


Can Lyme cause left bundle branch block?

Lyme disease may present with a variety of cardiac manifestations ranging from first degree to third degree heart block. Atrioventrical conduction abnormalities are the most common manifestation of Lyme carditis. Less common, are alternating right bundle branch block (RBBB) and left bundle branch block (LBBB).

Corrie Orange


Can you die from a right bundle branch block?

In people with known or suspected heart disease, right bundle branch block is associated with a greater risk of death, especially after a heart attack. Some people with right bundle branch block may ultimately need a permanent pacemaker, but this is rare.