left posterior fascicular block (LAPB)
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.
Last reviewed 01/2018