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Left posterior fascicular block

Medical condition

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Definition

The American Heart Association has defined a LPFB as:

  • Frontal plane axis between 90° and 180° in adults
  • rS pattern in leads I and aVL
  • qR pattern in leads III and aVF
  • QRS duration less than 120 ms

The broad nature of the posterior bundle as well as its dual blood supply makes isolated LPFB rare.

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