Left Axis Deviation

Left Axis Deviation

Definition

  • QRS axis between -30 and -90 degrees

Left axis deviation: -30 to -90 degrees

How to recognise left axis deviation

  • QRS is positive (dominant R wave) in leads I and aVL
  • QRS is negative (dominant S wave) in leads II and aVF

Left Axis Deviation: leads I and aVL are positive; leads II and aVF are negative

Causes

 

Acknowledgements

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