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Difference between RBBB and LBBB

Difference between RBBB and LBBB

There are two main types of heart rhythm abnormalities, right bundle branch block (RBBB) and left bundle branch block (LBBB). While both conditions can interfere with the normal flow of blood through the heart, they do so in different ways. RBBB is caused by a problem with the right side of the heart, while LBBB is caused by a problem with the left side of the heart. Understanding the difference between these two conditions can help you better understand your own health condition and provide you with important information about how to best manage it.

What is RBBB?

RBBB is a condition that affects the heart’s electrical activity. The main symptom of RBBB is a wide QRS complex on an electrocardiogram (ECG). RBBB occurs when the electrical signal that travels from the top of the heart to the bottom is delayed or blocked.

This can happen for a number of reasons, including damage to the heart’s electrical system, abnormalities in the heart’s structure, or a buildup of scar tissue.

RBBB is usually not life-threatening, but it can sometimes lead to more serious problems, such as heart failure. treatment typically focuses on managing the underlying condition that is causing RBBB. In most cases, RBBB does not require treatment and will resolve on its own.

What is LBBB?

LBBB, or left bundle branch block, is a common type of heart arrhythmia. It occurs when electrical impulses are delayed or blocked in the left bundle branch, which is one of the main arteries that carry electrical signals to the heart muscle.

This can cause the ventricles to beat out of sync, resulting in a slow or irregular heartbeat. LBBB is often first diagnosed during a routine physical exam or electrocardiogram (ECG).

In most cases, LBBB does not cause any symptoms and does not require treatment. However, in some cases, LBBB can lead to heart failure or other serious complications. LBBB is most commonly seen in older adults, but it can occur at any age.

Difference between RBBB and LBBB

RBBB and LBBB refer to two different types of heart block.

  • RBBB, or right bundle branch block, occurs when electrical signals are delayed in the right bundle branch. This can cause the ventricles to beat out of sync, leading to a number of symptoms including fatigue and shortness of breath.
  • LBBB, or left bundle branch block, occurs when electrical signals are delayed in the left bundle branch. This can also cause the ventricles to beat out of sync, but the symptoms tend to be more severe than with RBBB.
  • In both cases, treatment typically involves medications to help regulate heart rhythm. In some cases, a pacemaker may also be necessary. RBBB and LBBB are both serious conditions that require medical attention.

However, with proper treatment, most people with RBBB or LBBB can live normal, healthy lives.


Although the two heart rhythms may look very similar, they have different implications for patient health. Knowing how to identify each rhythm is important for healthcare providers so that they can provide appropriate treatment. It’s also important for patients and their families to be able to recognize the difference in order to understand what their diagnosis means for them. If you have any questions about RBBB or LBBB, be sure to speak with your doctor.

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