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