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Chapter 2. System Configuration
Connection of the Limb Electrodes
4 electrodes of 10 ECG electrodes are attached to the limbs. Reference lead is the electrode
connected onto the right leg.
Before connecting electrodes:
1- Prepare the patient's skin.
■The skin is a poor conductor of electricity, therefore preparation of the patient's skin is
important to facilitate good electrode contact to skin.
■Wash sites thoroughly with soap and water.
2- Apply some gel on the skin of these sites.
3- Place the electrode on proper site of the patient body.
The limb electrodes of 12-lead ECG should be placed in the following sites:
Left arm (L)
Right arm( R)
Left leg ( F)
Right leg (N)
Connection of the Chest Electrodes
Before connecting electrodes:
1- Prepare the patient's skin.
■ The skin is a poor conductor of electricity, therefore preparation of the patient's skin is
important to facilitate good electrode contact to skin.
■ Shave hair from sites, if necessary.
■Wash sites thoroughly with soap and water.
2- Apply some gel on the skin of these sites.
3- Place the chest electrode on proper site and press its suction bulb to attach it to the skin.
Figure 2-8 Connection of the Limb Electrodes
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