Left axis deviation

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File:Hexaxial reference system.svg
The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.

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

Common causes of LAD include left ventricular hypertrophy (LVH), 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.

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

References

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  1. ↑ 1.0 1.1 http://www.ecglibrary.com/axis.html
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ http://lifeinthefastlane.com/ecg-library/basics/left-axis-deviation/
  5. ↑ http://www.fpnotebook.com/cv/exam/LftAxsDvtn.htm
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