Bifascicular Block - ECG

Bifascicular block means combination of blockage of both bundle branches. The most common finding is LAFB + RBBB, or less frequent combination of LPFB + RBBB.

 

Bifascicular Block - ECGThis is a ECG record typical for bifascicular block. It is a combination of LAFB (blue) and RBBB (red). The QRS complexes are dilated.
 

Conslusion: Bifascicular block may be diagnosed randomly and it may (or may not) be related to chronic heart diseases. In older patients this finding may be accompanied with collapses. A relatively rare complication of a bifascicular block is the emergence of third-degree AV block. If the bifascicular block is accompanied with periods of unconsciousness, it is advisable to perform permanent pacing.