Left posterior fascicular block
A left posterior fascicular block (LPFB), also known as left posterior hemiblock (LPH), is a condition where the left posterior fascicle, which travels to the inferior and posterior portion of the left ventricle, does not conduct the electrical impulses from the atrioventricular node. The wave-front instead moves more quickly through the left anterior fascicle and right bundle branch, leading to a right axis deviation seen on the ECG.

Definition
The American Heart Association has defined a LPFB as:
Frontal plane axis between 90° and 180° in adults
rS pattern in leads I and aVL
qR pattern in leads III and aVF
QRS duration less than 120 msThe broad nature of the posterior bundle as well as its dual blood supply makes isolated LPFB rare.

See also
Left bundle branch block
Left anterior fascicular block

References
Further reading
Ma FS, Ma J, Tang K,  et al. (March 2006). "Left posterior fascicular block: a new endpoint of ablation for verapamil-sensitive idiopathic ventricular tachycardia". Chin. Med. J. 119 (5): 367–72. doi:10.1097/00029330-200603010-00003. PMID 16542578.


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