4 Electrode placement
4.10 Mason-Likar modified (exercise ECG)
Page 38
CT8000P-2
Art. no.: 2.511407 Rev.: a
4.10 Mason-Likar modified (exercise ECG)
For exercise testing, place electrodes C1 to C6 in the same positions as for the
standard resting ECG detailed above, and place the RA, LA, LL and N electrodes as
follows:
– LL on the left torso at the bottom of the rib cage
– RL (N) on right torso at the bottom of the rib cage
– LA and RR, place either on the back above the scapula or on the front just below
the clavicle
AHA label IEC label Electrode Placement
V1 red C1 red
Fourth intercostal space at the right sternal border
V2 yellow C2 yellow
Fourth intercostal space at the left sternal border
V3 green C3 green
Midway between C4 and C2
V4 blue C4 brown
Mid-clavicular line in the fifth intercostal space
V5 orange C5 black
Anterior axillary line on the same horizontal level as C4
V6 purple C6 purple
Mid-axillary line on the same horizontal level as C4 and C5
LA black L yellow
Slightly below the left clavicle
RA white R red
Slightly below the right clavicle
LL red F green
Lower edge of the rib cage, or at the level of the umbilicus
at the left and right mid-clavicular lines.
RL green N black
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.
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