Left posterior fascicular block causes

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Left posterior fascicular block Microchapters


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Differentiating Left posterior fascicular block from other Diseases

Epidemiology and Demographics

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Case #1

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ayokunle Olubaniyi, M.B,B.S [2]


Isolated left posterior fascicular block is often an uncommon finding[1] owing to the fact that the left posterior fascicle has a dual blood supply, and it is exposed to lower pressures and turbulence, hence, it is rarely damaged. It usually accompanies right bundle branch block (RBBB) or in the setting of arteriosclerotic heart diseases such as myocardial infarction. Other less common causes include: infectious (e.g. diphteritic myocarditis, Chagas disease); genetic (e.g. myotonic dystrophy).


Life Threatening Causes

Life-threatening causes include conditions which may result in death or permanent disability within 24 hours if left untreated.

Common Causes

Causes by Organ System

Cardiovascular Cardiomyopathy, coronary artery disease, diphteritic myocarditis, hypertensive heart disease, myocardial infarction
Chemical/Poisoning No underlying causes
Dental No underlying causes
Dermatologic No underlying causes
Drug Side Effect No underlying causes
Ear Nose Throat No underlying causes
Endocrine No underlying causes
Environmental No underlying causes
Gastroenterologic No underlying causes
Genetic Kearns-Sayre syndrome, limb-girdle muscular dystrophy, myotonic dystrophy
Hematologic No underlying causes
Iatrogenic No underlying causes
Infectious Disease Chagas disease, diphteritic myocarditis
Musculoskeletal/Orthopedic Limb-girdle muscular dystrophy, myotonic dystrophy
Neurologic Kearns-Sayre syndrome
Nutritional/Metabolic No underlying causes
Obstetric/Gynecologic No underlying causes
Oncologic No underlying causes
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary Cor pulmonale
Renal/Electrolyte Hyperkalemia
Rheumatology/Immunology/Allergy No underlying causes
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous No underlying causes

Causes in Alphabetical Order


  1. Godat, FJ.; Gertsch, M. (1993). "Isolated left posterior fascicular block: a reliable marker for inferior myocardial infarction and associated severe coronary artery disease". Clin Cardiol. 16 (3): 220–6. PMID 8443995. Unknown parameter |month= ignored (help)