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Test Findings
 
 

Bifascicular Block

 
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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.
  • 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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