What is the normal axis?
QRS axis between -30 degrees and 90 degrees
What is left axis deviation
QRS axis less than -30 degrees
What is right axis deviation
QRS axis greater than +90 degrees
What is extreme axis deviation
QRS axis between -90 degrees and 180 degrees (NW axis)
Why do children often have RAD
-Cardiac axis often lies between +30 and +190 degrees at birth
-Moves leftward with age