Left anterior hemiblock: Difference between revisions
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**It can be seen with acute inferior wall myocardial infarction.< | **It can be seen with acute inferior wall myocardial infarction.< | ||
*It also associated with hypertensive heart disease, aortic valvular disease, cardiomyopathies, and degenerative fibrotic disease of the cardiac skeleton. | *It also associated with hypertensive heart disease, aortic valvular disease, cardiomyopathies, and degenerative fibrotic disease of the cardiac skeleton. | ||
==Causes== | |||
Anomalous origin of the left coronary artery | |||
The anatomy of the left coronary artery is abnormal. | |||
Autosomal dominant bundle branch disease | |||
A genetic disease | |||
Cardiomyopathy: | |||
Ischemic cardiomyopathy | |||
Alcoholic cardiomyopathy | |||
Hypertrophic cardiomyopathy | |||
Restrictive cardiomyopathy | |||
Hypertensive cardiomyopathy | |||
Postpartum cardiomyopathy | |||
Coronary artery disease | |||
Double-outlet right ventricle | |||
Left ventricular hypertrophy | |||
Lentiginosis | |||
Persistent AV canal and Down syndrome | |||
Septal myomectomy | |||
A surgical procedure that removes a portion of the septum that separates the ventricles | |||
Single ventricle | |||
Subvalvar aortic resection | |||
Tetralogy of Fallot repair | |||
Transposition of the great vessels with a ventricular septal defect | |||
Tricuspid atresia | |||
A poorly formed tricuspid valve | |||
Ventricular septal defect repair | |||
==Examples== | ==Examples== | ||
Revision as of 01:52, 13 July 2012
| Left anterior hemiblock | |
 | |
|---|---|
| Example of left anterior hemiblock | |
| ICD-10 | I44-I45 |
| ICD-9 | 426.9 |
| DiseasesDB | 10477 |
| MeSH | D006327 |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]
Overview
Left anterior hemiblock is caused by interruption of the anterior division of the left bundle branch. This fascicle is fragile, easily exposed to damage, and has a single blood supply (the left anterior descending coronary artery).
Characteristics
Normal activation of the left ventricle proceeds down the left bundle branch, which consist of two fascicles the left anterior fascicle and left posterior fascicle. Left Anterior Fascicular Block (LAFB), which is also known as Left Anterior Hemiblock (LAHB), occurs when a cardiac impulse spreads first through the left posterior fascicle, causing a delay in activation of the anterior and lateral walls of the left ventricle which are normally activated via the left anterior fascicle.[1]
Although there is a delay or block in activation of the left anterior fascicle there is still preservation of initial left to right septal activation as well as preservation of the inferior activation of the left ventricule (preservation of septal Q waves in I and aVL and small initial R wave in leads II, III, and aVF). The delayed and unopposed activation of the remainder of the left ventricle now results in a shift in the QRS axis leftward and superiorly, causing marked left axis deviation. This delayed activation also results in a widening of the QRS complex, although not to the extent of a complete LBBB. [2]
Criteria for LAHB
- Left axis deviation (usually between -45° and -90°), some consider -30° to meet criteria
- QRS interval < 0.12 seconds
- qR complex in the lateral limb leads (I and aVL)
- rS pattern in the inferior leads (II, III, and aVF)
- Delayed intrinsicoid deflection in lead aVL (> 0.045 s)[3]
Exceptions
It is important not to call LAFB in the setting of a prior inferior wall myocardial infarction which may also demonstrate left axis deviation due to the initial forces (Q wave in a Qr complex) in leads II, III, and aVF. As opposed to LAHB, the left axis shift is due to terminal forces (i.e., the S wave in an rS complex) being directed superiorly,
Effects of LAHB on Diagnosing Infarctions and Left Ventricular Hypertrophy
LAHB may be a cause of poor R wave progression across the precordium causing a pseudoinfarction pattern mimicking an anteroseptal infarction. It also makes the electrocardiographic diagnosis of LVH more complicated, because both may cause a large R wave in lead aVL. Therefore to call LVH on an EKG in the setting of an LAHB you should see the presence of a “strain” pattern when you are relying on limb lead criteria to diagnose LVH.[4]
Clinical Significance
- It can be seen in approximately 4% of cases of acute myocardial infarction
- It is the most common type of intraventricular conduction defect seen in acute anterior myocardial infarction, and the left anterior descending artery is usually the culprit vessel.
- It can be seen with acute inferior wall myocardial infarction.<
- It also associated with hypertensive heart disease, aortic valvular disease, cardiomyopathies, and degenerative fibrotic disease of the cardiac skeleton.
Causes
Anomalous origin of the left coronary artery
The anatomy of the left coronary artery is abnormal.
Autosomal dominant bundle branch disease
A genetic disease
Cardiomyopathy:
Ischemic cardiomyopathy Alcoholic cardiomyopathy Hypertrophic cardiomyopathy Restrictive cardiomyopathy Hypertensive cardiomyopathy Postpartum cardiomyopathy
Coronary artery disease Double-outlet right ventricle Left ventricular hypertrophy Lentiginosis Persistent AV canal and Down syndrome Septal myomectomy
A surgical procedure that removes a portion of the septum that separates the ventricles
Single ventricle Subvalvar aortic resection Tetralogy of Fallot repair Transposition of the great vessels with a ventricular septal defect Tricuspid atresia
A poorly formed tricuspid valve
Ventricular septal defect repair
Examples
-
12 lead EKG: Left Anterior Hemiblock
-
12 lead EKG Left Anterior Hemiblock
References
- ↑ Mirvis DM, Goldberger AL. Electrocardiography. In: Braunwald E, Zipes DP, Libby P, eds. Heart disease: a textbook of cardiovascular medicine, 6th edn. Philadelphia: WB Saunders; 2001:82–125.
- ↑ Surawicz B, Knilans TK. Chou’s electrocardiography in clinical practice: adult and pediatric, 5th edn. Philadelphia: W.B. Saunders; 2001.
- ↑ Mirvis DM, Goldberger AL. Electrocardiography. In: Braunwald E, Zipes DP, Libby P, eds. Heart disease: a textbook of cardiovascular medicine, 6th edn. Philadelphia: WB Saunders; 2001:82–125.
- ↑ Surawicz B, Knilans TK. Chou’s electrocardiography in clinical practice: adult and pediatric, 5th edn. Philadelphia: W.B. Saunders; 2001.
Additional resources
- ECGpedia: Course for interpretation of ECG
- The whole ECG - A basic ECG primer
- 12-lead ECG library
- Simulation tool to demonstrate and study the relation between the electric activity of the heart and the ECG
- ECG information from Children's Hospital Heart Center, Seattle
- ECG Challenge from the ACC D2B Initiative
- National Heart, Lung, and Blood Institute, Diseases and Conditions Index
- A history of electrocardiography
- EKG Interpretations in infants and children