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 atrioventricular node (AV node, or Aschoff-Tawara node) electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart; it is part of the electrical conduction system of the heart. The AV node lies at the ...
. 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
The American Heart Association (AHA) is a nonprofit organization in the United States that funds cardiovascular medical research, educates consumers on healthy living and fosters appropriate Heart, cardiac care in an effort to reduce disability ...
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
*
Left anterior fascicular block
*
Left bundle branch block
References
Further reading
*
External links
Cardiac arrhythmia
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