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Conduction Disorders
Conduction Disorders

Bifascicular Block



  • 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.
    • Look For

    • 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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