From Wikipedia, the free encyclopedia
Medical condition
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]
See also
References
^ Kevin J. Koop; et al., eds. (2010). "23". Atlas of emergency medicine (3rd ed.). New York: McGraw-Hill Professional.
ISBN
978-0071496186 .
^
"Lesson VI - ECG Conduction Abnormalities" . Retrieved 2009-01-07 .
^ Surawicz B, Childers R, Deal BJ, Gettes LS, Bailey JJ, Gorgels A, Hancock EW, Josephson M, Kligfield P, Kors JA, Macfarlane P, Mason JW, Mirvis DM, Okin P, Pahlm O, Rautaharju PM, van Herpen G, Wagner GS, Wellens H (2009).
"AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology" . J. Am. Coll. Cardiol . 53 (11): 976–81.
doi :
10.1016/j.jacc.2008.12.013 .
PMID
19281930 .
^ James, TN (Dec 1965).
"Anatomy of the coronary arteries in health and disease" . Circulation . 32 (6): 1020–33.
doi :
10.1161/01.cir.32.6.1020 .
PMID
5846099 .
^ Rokey, R.; Chahine, R. A. (June 1984).
"Isolated left posterior fascicular block associated with acquired ventricular septal Defect" . Clinical Cardiology . 7 (6): 364–369.
doi :
10.1002/clc.4960070608 .
PMID
6744692 .
Further reading
External links