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]
Definition
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]
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