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Conduction Disorders
Conduction Disorders

Left Anterior Fascicular Block

February 15th, 2021


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

  • Left axis deviation -45° to -90° in the absence of other causes
  • Normal QRS duration <120ms
  • qR pattern in aVL: small Q wave with large R wave
  • Long R peak time (time from start of QRS to peak of R) >45ms in aVL
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