Left posterior fascicular block

Left posterior fascicular block
Classification and external resources
Specialty	cardiology
ICD-10	I44.5
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A left posterior fascicular block (LPFB) 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.

The American Heart Association has defined a LPFB as:

The broad nature of the posterior bundle as well as its dual blood supply makes isolated LPFB rare.

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