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Left Axis Deviation

Aka: Left Axis Deviation

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

Left axis deviation (C0232297)
Concepts	Laboratory or Test Result (T034)
SnomedCT	39732003, 164952002, 142124001
English	LEFT AXIS DEVIATION, ELECTROCARDIOGRAPHIC, Left axis deviation by EKG, Ekg Left Axis Deviation, Left axis deviation, EKG, EKG AXIS DEVIATION LEFT, left axis deviation, left axis deviation ekg, axis deviation left, axis deviation ekg left, Left axis deviation, LAD - Left axis deviation, Left axis deviation (finding)
Spanish	Left axis deviation, signos electrocardiográficos de desviación del eje hacia la izquierda (hallazgo), signos electrocardiográficos de desviación del eje hacia la izquierda
Sources	Derived from the NIH UMLS (Unified Medical Language System)

Family Practice Notebook

Patients should address specific medical concerns with their physicians.

Although access to this page is not restricted, the information found here is intended for use by medical providers.

This page was written by Scott Moses, MD, last revised on 5/17/2008 and last published on 6/18/2013.

This is one of 5909 pages in the Family Practice Notebook