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* First, when a positive depolarization wave moves towards a positive electrode, a positive, upwards deflection is registered on the ECG.
*Second, there are 4 quadrants where the QRS-vector can point to:
**left upper quadrant --> left axis deviation (between -
30º and - 90º)**left lower quadrant --> normal (between - 30º and 90º)**right below and right --> right axis deviation (between 90º and - 150º)**right upper quadrant --> extreme axis (between - 90º and - 150º)