Left anterior fascicular block causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Overview

Left anterior fascicular block, which is more common than left posterior fascicular block, may be due to damages to the left anterior fascicle as it passes through the left ventricular outflow tract, such causes include aortic stenosis, hypertensive heart disease and cardiomyopathy. It can also be caused by congenital heart diseases such as Atrial septal defect, atrioventricular septal defect, single ventricle, e.t.c However, life threatening conditions such as myocardial infarction must be promptly identified and treated accordingly.

Causes

Life Threatening Causes

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

• Myocardial infarction

Common Causes

• Aortic stenosis
• Cardiomyopathy
• Coronary artery disease
• Hypertensive heart disease
• Left ventricular hypertrophy
• Myocardial infarction

Causes by Organ System

Cardiovascular	Alcoholic cardiomyopathy, anomalous origin of the left coronary artery, aortic stenosis, atrial septal defect, atrioventricular septal defect, coronary artery disease, double outlet right ventricle, hypertensive heart disease, hypertrophic cardiomyopathy, ischemic cardiomyopathy, left ventricular hypertrophy, Lev's disease, myocardial infarction, postpartum cardiomyopathy, restrictive cardiomyopathy, single ventricle, transposition of the great vessels, tricuspid atresia
Chemical/Poisoning	No underlying causes
Dental	No underlying causes
Dermatologic	Lentiginosis
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	Atrial septal defect, Charcot-Marie-Tooth disease, double outlet right ventricle, Kearns-Sayre syndrome, lentiginosis, limb-girdle muscular dystrophy
Hematologic	No underlying causes
Iatrogenic	Aortic valve replacement, septal myomectomy, subvalvar aortic resection, Tetralogy of Fallot repair, ventricular septal defect surgery
Infectious Disease	Chagas disease
Musculoskeletal/Orthopedic	Limb-girdle muscular dystrophy
Neurologic	Charcot-Marie-Tooth disease, Kearns-Sayre syndrome
Nutritional/Metabolic	No underlying causes
Obstetric/Gynecologic	Postpartum cardiomyopathy
Oncologic	No underlying causes
Ophthalmologic	No underlying causes
Overdose/Toxicity	No underlying causes
Psychiatric	No underlying causes
Pulmonary	Obstructive sleep apnea
Renal/Electrolyte	No underlying causes
Rheumatology/Immunology/Allergy	No underlying causes
Sexual	No underlying causes
Trauma	No underlying causes
Urologic	No underlying causes
Miscellaneous	Ageing

Causes in Alphabetical Order

• Ageing
• Alcoholic cardiomyopathy
• Anomalous origin of the left coronary artery
• Aortic stenosis
• Aortic valve replacement
• Atrial septal defect
• Atrioventricular septal defect
• Chagas disease
• Charcot-Marie-Tooth disease
• Coronary artery disease
• Double outlet right ventricle
• Hypertensive heart disease
• Ischemic cardiomyopathy
• Kearns-Sayre syndrome
• Left ventricular hypertrophy

• Lentiginosis
• Lev's disease
• Limb-girdle muscular dystrophy
• Myocardial infarction
• Obstructive sleep apnea
• Postpartum cardiomyopathy
• Restrictive cardiomyopathy
• Septal myomectomy
• Single ventricle
• Subvalvar aortic resection
• Tetralogy of Fallot repair
• Transposition of the great vessels
• Tricuspid atresia
• Ventricular septal defect surgery

References

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