Actions Before Recording; Ecg Electrodes Connection - Saadat DENA 1210 User Manual

Chapter 3: Patient preparation

Actions before recording

• Give the patient enough time to relax after lying on the bed.
• If necessary, shave the hair where the electrodes are placed on the patient's skin.
• The connection of the electrodes to the skin should be cleaned with alcohol or a solution
of soap and water and then dried.
• Use enough gel.
• The ambient temperature should be appropriate and the patient should not suffer from
cold and tremors.
• Make and control all necessary settings on the device before recording.
• When recording, ask the patient to be as calm and still as possible, not to talk, and not
to contract their muscles.
• At the beginning / end of the recording, or at least at the end of each shift, the
accessories, especially the clamp and suction chest electrodes, should be cleaned.

ECG electrodes connection

The ECG cable consists of two parts: the connector that connects to the device and the lead
wires that connect to the patient (Figure 4-1).
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.
• Use only clean and intact electrodes. Using electrodes whose surface is damaged may
cause the ECG waveform to be inaccurate.
Figure 3-1 ECG cable
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