Lad

Left Axis Deviation LAD Left Axis Deviation = QRS axis less than -30°. Normal Axis = QRS axis between -30° and +90° Right Axis Deviation = QRS axis greater than +90° Extreme Axis Deviation = QRS axis between -90° and 180° (AKA “Northwest Axis”) Hexaxial Reference System Hexaxial Reference System – relationship between QRS axis and frontal leads of the ECG. How to recognise left axis deviation Three Lead analysis QRS is POSITIVE (dominant R wave) in Lead I QRS is NEGATIVE (dominant S wave) in leads II, III and aVF ...