| 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, 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 ms
The broad nature of the posterior bundle as well as its dual blood supply makes isolated LPFB rare.
See also
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.