ECG leads: The Dirty Dozen

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ECG leads: The Dirty ECG leads: The Dirty Dozen Dozen Conventionall y, 12 leads or sets of electrodes [email protected] [email protected] [email protected] 2013 2013

description

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.

Transcript of ECG leads: The Dirty Dozen

Page 1: ECG leads: The Dirty Dozen

ECG leads: The Dirty ECG leads: The Dirty DozenDozen

Conventionally,

12 leads or sets of electrodes

[email protected]@[email protected]

20132013

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ECG leads: The ECG leads: The DirtyDirty Dozen Dozen

DirectionPolarity

Why do I need to know these details ??

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Because the Because the DirtyDirty Dozen Dozen

DirectionPolarity

1. determine deflections of the ECG2. detect direction of depolarization

wave Deviation of cardiac axis3. detect (or localize) the diseased or

disordered part of the heart

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Hi, I’m EasyG. I’ll show you to work out the

ofof

Dirty Dirty

half-Dozenhalf-Dozen

Direction &Polarity

the 6 limb leads in the frontal plane

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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

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Where shall we start forming a triangle? The top, of course,

since we always read from top downwards

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Which arm shall we move first ? Ah!! The right arm!! as most of us are right-handed

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So, make a fist. And make your 1st move.Swing up your arm.

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The 1st move, the top border of a triangle

so its Lead IThe fist always is the

(+)ve electrode

The shoulder the (-)ve electrode

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The 2nd move, swing your arm down to form the 2nd border

… its Lead II

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Now it’s the left arm’s job to make a 3rd move and close the triangle

… its Lead III

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Raise the right fist like this

… its aVR

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Raise the left fist like this, it’s…

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Stomp the ground with your left foot,it’s…

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Once more!!!

Action!

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I

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II

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III

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aVR

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aVL

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aVF

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Lead I

aVL

Lead III Lead II

aVR

aVF

Got it?Thanks !!!