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Fig. 2.9: Unipolar leads’ geometry according to Goldberg.
Wilson’s chest leads
The limb leads mentioned so far represent the heart’s electrical activity in the frontal
plane; yet the unipolar chest leads according to Wilson provide information about the heart’s
electrical activity in a horizontal plane. Six active electrodes are placed to specific locations
on the chest, and the difference in these potentials is measured against the so called Wilson’s
central terminal (W), which is created by averaging-out all the three limb leads, see below.
Fig. 2.10: Layout of the chest leads according to Wilson.
U
V1
= Φ
V1
- Φ
W
U
V2
= Φ
V2
- Φ
W
U
V3
= Φ
V3
- Φ
W
…
U
V6
= Φ
V6
- Φ
W
U
aVR
= Φ
R
– (Φ
L
+ Φ
F
)/2
U
aVL
= Φ
L
– (Φ
R
+ Φ
F
)/2
U
aVF
= Φ
F
– (Φ
R
+ Φ
L
)/2
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