Determining AXIS
Examine QRS in Lead I and Lead aVF
Lead I |
Lead aVF |
Axis |
Positive |
Positive |
Normal |
Positive |
Negative |
Possible LAD |
Negative |
Positive |
RAD |
Negative |
Negative |
Extreme axis deviation |
Alternatively, examine lead I and lead II
Lead I |
Lead II |
Axis |
Positive |
Positive |
Normal |
Positive |
Negative |
LAD |
Negative |
Positive |
RAD |