4 quadrant method
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12-Lead Electrocardiography
a comprehensive course
Adam Thompson, EMT-P, A.S.
Axis: The
Quadrant
Method
![Page 2: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/2.jpg)
Quadrant Method
• Much easier to do. • Faster and more practical for rapid
interpretation. • Does not give you a very close
estimate.
![Page 3: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/3.jpg)
Quadrant Method
ERAD LAD
RAD Normal
180 0
-90
90
![Page 4: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/4.jpg)
Quadrant Method
ERAD LAD
RAD Normal
- I I +
aVF +
aVF -
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Quadrant Method
- I I +
aVF -
Negative QRS Complex in aVF Positive QRS Complex in aVF
aVF +
- I I +
aVF +
aVF -
Positive QRS in Lead I
Negative QRS in Lead I
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Quadrant method
Is Lead I up or down?
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Quadrant Method
- I I +
aVF +
aVF -
![Page 8: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/8.jpg)
Quadrant method
Is aVF up or down?
![Page 9: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/9.jpg)
Quadrant Method
- I I +
aVF +
aVF -
![Page 10: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/10.jpg)
Quadrant Method
- I I +
aVF +
aVF -
ERAD LAD
RAD Normal
180 0
-90
90
![Page 11: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/11.jpg)
Quadrant Method
![Page 12: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/12.jpg)
Frontal Plane Axis Pathologies
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Quadrant Method
Lead I aVF
Normal Positive (+) Positive (+)
RAD Negative (-) Positive (+)
LAD Positive (+) Negative (-)
ERAD Negative (-) Negative (-)
![Page 14: 4 quadrant method](https://reader033.fdocuments.us/reader033/viewer/2022061213/549864d6ac795982318b4ab2/html5/thumbnails/14.jpg)
If all else fails…
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That’s It