Cardiovascular Medicine Book

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Left Axis Deviation

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  1. See Also
    1. EKG Axis
  2. Definition
    1. Deviation into lead aVL axis (90 to 180 degrees)
  3. 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
  4. 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
  5. Non-Causes of Left Axis Deviation
    1. Left Ventricular Hypertrophy is not a deviation cause

Left axis deviation (C0232297)

ConceptsLaboratory or Test Result (T034)
EnglishEkg Left Axis Deviation, LAD - Left axis deviation, Left axis deviation, Left axis deviation by EKG
Spanishsignos electrocardiograficos de desviacion del eje hacia la izquierda
Parent Concepts[D]Electrocardiogram (ECG) abnormal (C0522055), Cardiac conduction system finding (C0577805), QRS Axis - finding (C1287697), Duplicate concept (C1274013)
SourcesDXP, QMR, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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