See Also
1. EKG Axis
Definition
1. Deviation into lead aVL axis (90 to 180 degrees)
Interpretation: Pathologic Left Axis Deviation
1. Left Posterior Hemiblock (rare due to dual supply)
2. Left Anterior Hemiblock
  1. QRS Axis more negative than -30 degrees (AVL)
  2. Axis <-30 if Lead II is more negative than positive
Causes
1. Normal variant
2. Mechanical shift
  1. Ascites
  2. High diaphragm
3. Left Atrial hypertrophy
4. Left Bundle Branch Block
5. Wolf-Parkinson-White Syndrome (WPW Syndrome)
6. Chronic Obstructive Pulmonary Disease (COPD)
7. Hyperkalemia
8. Right ventricular ectopic rhythms
Non-Causes of Left Axis Deviation
1. Left Ventricular Hypertrophy is not a deviation cause

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This page was written by Scott Moses, MD. This page was last revised on 4/26/2008 9:07:43 PM. This page was last published on 4/29/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.