Right bundle branch block

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ECG characteristics of a typical RBBB showing wide QRS complexes with abnormal morphology in leads V1 and V6.

Right bundle branch block (RBBB) is a cardiac conduction abnormality seen on electrocardiogram (EKG/ECG). An rSR' wave pattern in the V1 precordial lead is diagnostic. The T wave in lead V1 is inverted, which is normal with an RBBB. Lead V6 will show a wide and deep s wave (this is called a slurred s wave) and the small q wave in this lead may not always be present.

During a right bundle branch block, the right ventricle is not directly activated by impulses travelling through the right bundle branch. The left ventricle however, is still normally activated by the left bundle branch and these impulses travel through the left ventricle's myocardium to the right ventricle and activate the right ventricle. This is why the right ventricle's activation is delayed, resulting in a wide QRS complex on the EKG.

Prevalence of RBBB increases with age.

It is seen in Brugada syndrome. However, an isolated RBBB, unlike LBBB, is generally considered benign.

[edit] See also

• Bundle branch block
• Left bundle branch block

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