Left anterior hemiblock
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| Left anterior hemiblock Classification and external resources | |
 | |
|---|---|
| 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] Phone:617-525-6884
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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. [1]
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)[1]
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.[1]
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.
Examples
 12 lead EKG: Left Anterior Hemiblock |
 12 lead EKG Left Anterior Hemiblock |
References
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
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
