
SpiroSphere
®
ECG Instructions for Use
Page 64/136
Version 02.02 • 04AUG2022
The different measurement setups are commonly referred to as leads.
For a standard 12-lead ECG, four electrodes are placed at the limbs and six at the chest.
The 12 leads are:
Three bipolar limb leads: I, II and III (according to
Einthoven
)
I
II
III
Three unipolar limb leads: aVR, aVL and aVF (according to
Goldberger
)
I
II
III
Six unipolar chest leads: V1, V2, V3, V4, V5, V6 (according to
Wilson
)
V1
V2
V3
V4
V5
V6
In contrast to the limb leads, the chest leads have to be positioned precisely. The lead positions
are internationally standardized.
V1
V2
V3
V4
V5 V6
V1: 4
th
intercostal space, right sternal border
V2: 4
th
intercostal space, left sternal border
V3: midway between V2 and V4
V4: 5
th
intercostal space, left mid-clavicular line
V5: between V4 and V6, left anterior axillary line
V6: level with V4, left mid-axillary line
Lateral view of lead positions
MCLL
VAXL
MAXL =
mid-axillary line
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