User's Manual

8 - 4
more information, see 8.4.4.3Chest Electrode Placement. The Va and Vb lead positions are configurable. For more
information, see 8.5.3.3Changing Va and Vb Labels.
8.4.4.3 Chest Electrode Placement
The chest electrode can be placed at the following positions:
■ V1 placement: on the fourth intercostal space to the right of
the sternum.
■ V2 placement: on the fourth intercostal space to the left of
the sternum.
■ V3 placement: midway between the V2 and V4 electrode
positions.
■ V4 placement: on the fifth intercostal space at the left
midclavicular line.
■ V5 placement: on the left anterior axillary line, horizontal with
the V4 electrode position.
■ V6 placement: on the left midaxillary line, horizontal with the V4 electrode position.
■ V3R-V6R placement: on the right side of the chest in positions corresponding to those on the left.
NOTE
• For the 5-leadwire and 6-leadwire placement, place the precordial electrode according to the
physician's preference.
8.4.4.4 10-leadwire Electrode Placement
12-lead ECG uses 10 electrodes, which are placed on the patient’s four limbs
and chest. The limb electrodes should be placed on the limb extremities and
the chest electrodes placed according to the physician’s preference. The figure
at right illustrates the conventional 10-leadwire electrode placement.
8.4.4.5 Lead Placement for Surgical Patients
The surgical site should be taken into consideration when placing electrodes on a surgical patient. For example,
for open-chest surgery, the chest electrodes can be placed on the lateral chest or back. To reduce artifacts and
interference from electrosurgical units, you can place the limb electrodes close to the shoulders and lower
abdomen and the chest electrodes on the left side of the mid-chest. Do not place the electrodes on the upper
arm. Otherwise, the ECG waveform will be very small.
V1
V6
V5
V4
V2
V3