- The direction of the ventricular depolarization (QRS complex) is analyzed.
- Refer to lead I and aVF each time
- If the majority of the QRS complex is positively deflected in both views, this is referred to as “normal axis”.
If lead I is positive and aVF is negative, this is ‘left axis deviation”
If lead I is negative and aVF is positive, this is “right axis deviation”.
If lead I is negative and aVF is negative, this is extreme right axis deviation aka indeterminate.