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Axis deviation (left)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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In this condition there is a swing of the cardiac axis to the left - ie less than minus 30 degrees. It is usually the result of a left anterior hemiblock rather than to the increased bulk of muscle of the left ventricle. Other causes include:

  • inferior myocardial infarction
  • ventricular pre-excitation
  • hyperkalaemia
  • tricuspid atresia
  • ostium primum atrial septal defect
  • artificial cardiac pacing

ECG findings: the QRS becomes predominantly negative in III and positive in aVL. The condition is not significant until the QRS is also predominantly negative in II.

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