Bifascicular block

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Bifascicular block
Bifascicular block ECG.png
bifascicular block on an electrocardiogram
SpecialtyCardiology Edit this on Wikidata

Bifascicular block is a conduction abnormality in the heart where two of the three main fascicles of the His/Purkinje system are blocked.

Most commonly, it refers to a combination of right bundle branch block (RBBB) and either left anterior fascicular block (LAFB) or left posterior fascicular block (LPFB), with the former being more common.[1]

Some authors consider left bundle branch block (LBBB) to be a technical bifascicular block, since the block occurs above the bifurcation of the left anterior and left posterior fascicles of the left bundle branch.[citation needed]



In those with bifascicular block and no symptoms, little with respect to treatment is needed. In those with syncope, a pacemaker is recommended.[citation needed]


  1. ^ "Lesson VI - ECG Conduction Abnormalities". Archived from the original on 16 January 2009. Retrieved 2009-01-07.

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