Left posterior fascicular block

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Left posterior fascicular block
Other names	Left posterior hemiblock
Specialty	Cardiology

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,^[1] 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.^[2]

The American Heart Association has defined a LPFB as:^[3]

• 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 ms

The broad nature of the posterior bundle as well as its dual blood supply^[4] makes isolated LPFB rare.^[5]

• Left anterior fascicular block
• Left bundle branch block

• 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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