Left axis deviation
From Wikipedia, the free encyclopedia
Left axis deviation (LAD) is a condition whereby the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between -30° and -90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II.[1]
Cause [edit]
Common causes of LAD include left ventricular hypertrophy, left anterior fascicular block (or hemiblock) and inferior myocardial infarction.[2][3] Less commonly LAD may be a normal variant, particularly in obese or stocky individuals, or it may be associated with Wolff-Parkinson-White Syndrome or an Ostium primum atrial septal defect.
Left ventricular hypertrophy (LVH) is generally recognised as a cause of LAD,[2][3][4] although some sources claim that LVH does not cause LAD.[1][5]
See also [edit]
References [edit]
- ^ a b http://www.ecglibrary.com/axis.html
- ^ a b Lilly, Leonard (2006). Pathophysiology of Heart Disease. Lippincott Williams and Wilkins. ISBN 978-0-7817-6321-9.
- ^ a b Harrison's Principles of Internal Medicine (16th ed.). McGraw-Hill. 2005. p. 1314. ISBN 0-07-147760-8.
- ^ http://lifeinthefastlane.com/ecg-library/basics/left-axis-deviation/
- ^ http://www.fpnotebook.com/cv/exam/LftAxsDvtn.htm
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