Left anterior fascicular block

His-Purkinje system and hemiblocks

Criteria

Diagnostic criteria include[1]:

  1. Left axis deviation (-45 or more)
  2. QRS 80-110ms
  3. rS in II, III, and AVF
  4. qR in I and aVL
  5. Increased QRS voltage in the limb leads

Significance

  • Considered benign finding
  • LAFB may increase risk of AF, CHF, and death[2]

See Also

External Links

References

  1. ↑ Surawicz B, Knilans T. Chou’s Electrocardiography in Clinical Practice (6th edition), Saunders 2008.
  2. ↑ Mandyam MC, et al. Long-term outcomes of left anterior fascicular block in the absence of overt cardiovascular disease. JAMA. 2013; 309(15):1587-1588.
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