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ECG leads: The Dirty Dozen
This document discusses the 12 standard electrocardiogram (ECG) leads used to monitor the heart from different electrical perspectives. It explains that the "Dirty Dozen" leads determine the direction and polarity of the depolarization wave, which can detect diseased parts of the heart. The second half focuses on forming a triangle with the arms and legs to represent the spatial positions of the 6 limb leads (Leads I, II, III, aVR, aVL, aVF) in the frontal plane.
ECG leads: The Dirty Dozen
- 1. ECG leads: TheDirtyECG 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: TheECGleads: The DirtyDirtyDozenDozen Direction Polarity Why do I need to know these details ??
- 3. Because theBecause theDirtyDirtyDozenDozen 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 limbleads 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 westart forming a triangle? The top, of course, since we always read from top downwards
- 7. Which arm shallwe move first ? Ah!! The right arm!! as most of us are right-handed
- 8. So, make afist. 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, swingyour arm down to form the 2nd border … its Lead II
- 11. Now it’s theleft arm’s job to make a 3rd move and close the triangle … its Lead III
- 12. Raise the rightfist like this … its aVR
- 13. Raise the leftfist like this, it’s…
- 14. Stomp the ground withyour left foot, it’s…
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- 28. Lead I aVL Lead IIILead II aVR aVF Got it? Thanks !!!