Using and Taking Care of Electrodes

Storage of Electrodes

The C.Net5000 and C.Net2000+ ambulatory ECG monitors use three single-use disposable electrode pads per test. The pads are self-adhesive with a conductive gel-filled centre. They are designed to stay in place for a 24-hour test period, unlike resting-ECG electrodes that are designed for only a few minutes use.

It is very important not to allow the conductive gel to dry out. If this happens, a good electrical contact cannot be made with the skin, which leads to poor test results (shown as low percentage analysed in the report).

After opening a pack and removing three electrodes for use, seal the packet by folding over the opened side twice, and holding it closed with paper clips. If you do not plan to use the remaining electrodes within a few days, then use sticky tape to completely seal the packet.

Electrode Placement

The picture below shows the correct location of the electrode pads. Placing the electrode pads away from the preferred locations may increase artefact and reduce the accuracy of analysis.

Skin Preparation

Correct skin preparation ensures that a good electrical contact is made between the patient and the electrode pads, so that the ECG monitor detects a good quality signal.

1. Select sites for the pads as shown in the picture; it is best to avoid bony prominences or fatty areas and major muscles. This will help reduce movement-related artefact and maximise signal strength.

2. If the patient has a significant amount of hair at the pad site, the hair should be clipped or shaved, taking care not to irritate the skin.

3. The pad site must be clean and dry before placing the pads. Dry skin contributes to good pad adhesion and trace quality. If alcohol is used, allow the skin to dry thoroughly before applying the pads.

4. Use the supplied abrasive strips to remove the layer of skin cells around the pad location. Gently wipe the abrasive strip across the pad site 3 times, and no more. Excessive abrasion will cause reddening of the skin and poor signal quality.

5. Always attach the electrode lead to the pads before placing the pads on the patient. This makes it easier for you to put the pads in the correct place and avoids causing discomfort for the patient. It also prevents spreading the conductive gel across the adhesive, which could cause the pads not to stick.