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ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
ECG leads: The Dirty Dozen
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ECG leads: The Dirty Dozen

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Mr. EasyG, a cartoon character, shows you the easy way to remember the direction and polarity of the 6 limb leads - the dirty half-dozen- important to localize the part of heart affected by the …

Mr. EasyG, a cartoon character, shows you the easy way to remember the direction and polarity of the 6 limb leads - the dirty half-dozen- important to localize the part of heart affected by the disease process(e.g. inferior infarct) and to determine the electrical axis of the heart.

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  • 1. ECG leads: The DirtyECG leads: The Dirty DozenDozen Conventionally, 12 leads or sets of electrodes nyunt_wai@imu.edu.mynyunt_wai@imu.edu.my victor.nwai@gmail.comvictor.nwai@gmail.com 20132013
  • 2. ECG leads: TheECG leads: The DirtyDirtyDozenDozen Direction Polarity Why do I need to know these details ??
  • 3. Because theBecause the DirtyDirtyDozenDozen Direction Polarity 1. determine deflections of the ECG 2. detect direction of depolarization wave Deviation of cardiac axis 3. detect (or localize) the diseased or disordered part of the heart
  • 4. Hi, I’m EasyG. I’ll show you to work out the ofof DirtyDirty half-Dozenhalf-Dozen Direction & Polarity the 6 limb leads in the frontal plane
  • 5. the 6 limb leads in the frontal plane Lead I aVL Lead III Lead II aVR aVF monitoring the heart from different electrical perspectives It’s not fair to label us the dirty half-dozen The other half-dozen are on the chest – the 6 chest leads
  • 6. Where shall we start forming a triangle? The top, of course, since we always read from top downwards
  • 7. Which arm shall we move first ? Ah!! The right arm!! as most of us are right-handed
  • 8. So, make a fist. And make your 1st move. Swing up your arm.
  • 9. The 1st move, the top border of a triangle so its Lead I The fist always is the (+)ve electrode The shoulder the (-)ve electrode
  • 10. The 2nd move, swing your arm down to form the 2nd border … its Lead II
  • 11. Now it’s the left arm’s job to make a 3rd move and close the triangle … its Lead III
  • 12. Raise the right fist like this … its aVR
  • 13. Raise the left fist like this, it’s…
  • 14. Stomp the ground with your left foot, it’s…
  • 15. Once more!!! Action!
  • 16. I
  • 17. II
  • 18. III
  • 19. aVR
  • 20. aVL
  • 21. aVF
  • 22. Lead I aVL Lead III Lead II aVR aVF Got it? Thanks !!!

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