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Conduction Disorders

Left Posterior Fascicular Block

February 15th, 2021


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
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