Bifascicular Block:

1. Left anterior fascicular block (LAFB) or left posterior fascicular block (LPFB)

AND

2. Right bundle branch block (RBBB)

 

Trifascicular Block (impending):

1. Left anterior fascicular block (LAFB) or left posterior fascicular block (LPFB)

2. Right bundle branch block (RBBB)

AND

3. First degree AV Block (Delayed conduction through the remaining fascicle)

NOTE: If complete blockage, third degree heart block will occur!

REFERENCES

  1. Life in the Fast Lane
  2. Healio.com

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