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Left anterior fascicular block (LAFB)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

This occurs if there is a failure of conduction of either the anterior or posterior fascicle of the left bundle. If there are no other conduction abnormalities then the duration of the QRS complex is not prolonged beyond 0.11s.

  • if there is left anterior fascicle block then this results in left axis deviation.
  • if there is left posterior fascicle block then this is associated with right axis deviation.

Click here for an example ECG of left anterior fascicular block

Click here for an example ECG of left posterior fascicular block

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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