Connection Of The Limb Electrodes - Saadat Dena User Manual

Chapter 4: Preparation
Warning
When the device is used with electrocautery unit, please note the position of leads. In order
to reduce the hazard of burns, the leads should be located away from the electrocautery
pen and return electrode.
Warning
Use only one type of electrode on the same patient to avoid variations in electrical
impedance. It is recommended to use silver/silver chloride electrode. When dissimilar
metals are used for different electrodes, the electrodes may cause large offset potentials
due to polarization, which may be severe enough to prevent obtaining an ECG trace. Using
dissimilar metals may also increase recovery time after defibrillation.
Warning
Use intact and clean electrodes only. Electrodes with damaged surface may cause ECG
waveform inaccuracy.

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 the 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)
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