3-8 CASE Revision C
2060290-201
Applying Electrodes
MASON-LIKAR Lead Electrode Placement
(Modified Standard Leads for Exercise Tests)
Note
The ECG recorded with the torso placement of the limb lead
electrodes may differ from that recorded with the electrodes on the
limbs. Affected characteristics are the Q-waves and the frontal axes,
whereas ST levels are unlikely to change.
This lead placement is the preferred placement for exercise stress
tests on treadmills or bicycles with patients in the supine or half-
supine position.
For upright bicycle exercise stress tests it is recommended to apply
the limb leads on the back, opposite the limb electrode positions
shown above.
AHA Label
IEC Label Electrode Placement
A V1 red C1 red Fourth intercostal space at the right sternal border.
B V2 yellow C2 yellow Fourth intercostal space at the left sternal border.
C V3 green C3 green Midway between sites B and D.
D V4 blue C4 brown Mid-clavicular line in the fifth intercostal space.
E V5 orange C5 black Anterior axillary line on the same horizontal level as
D.
F V6 purple C6 purple Mid-axillary line on the same horizontal level as D
and E.
G
J
LA black
RA white
L yellow
R red
Slightly below the right and left clavicle.
H
I
LL red
RL green
F green
N black
Lower edge of the rib cage, or at the level of the
umbilicus at the left and right mid-clavicular lines.
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