Left Posterior Fascicular Block | Conduction Disorders - MedSchool
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Conduction Disorders
 
 
Conduction Disorders
Left posterior fascicular block occurs due to failure of conduction down the left posterior fascicle.
 

Left Posterior Fascicular Block

 
 

Overview

  • Left posterior fascicular block occurs due to failure of conduction down the left posterior fascicle.
    • Look For

    • Right axis deviation 90° to 180° in the absence of other causes
    • Normal QRS duration <120ms
    • rS pattern in I and aVL: small R wave with large S wave
    • qR pattern in III and aVF
Last updated on November 15th, 2019
 
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