Overview
Bifascicular block occurs when there is failure of conduction down the right bundle branch as well as either the left anterior or left posterior fascicle.
Diagnosis
ECG Findings
- Right bundle branch block - wide QRS (>120ms), RSR' pattern in V1 or V2, slurred S wave in I, V5, V6
- Either left (LAFB) or right (LPFB) axis deviation
- Right bundle branch block:
![Right bundle branch block]()
- Left anterior fascicular block:
![Left anterior fascicular block]()
- Left posterior fascicular block:
![Left posterior fascicular block]()
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