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7-3
Caution
Interference from an ungrounded equipment near the patient or
electrosurgery usage can induce noise and artifact into the waveforms.
Caution
When the monitor is inoperable due to overload of ECG signal or
saturation of any part of the amplifier, it will prompt ―Lead off‖ to remind the
operator.
Caution
Transient caused by cable circuitry blocks while monitoring may cause
artifact on ECG signals yielding wrong heart rate reading and even
triggering false alarm. If the electrodes and cable are located in proper
places according to this manual’s instructions for using electrodes, the
chance of this transient occurrence will be decreased.
7.3 ECG Monitoring Preparation
7.3.1 Preparing the Patient Skin
The quality of the ECG waveform displayed on the monitor is the
direct reflection of the ECG signal received at the electrode sites.
The state of patient's skin directly affects the strength of ECG signal
and the accuracy of monitoring information. As the skin is a poor
conductor of electricity, therefore preparation of the patient's skin is
very important to facilitate good electrode contact to the skin.
To properly prepare the patient skin, please refer to the following
steps:
1. Select sites with intact skin, without impairment of any kind.
Shave hair from sites, if necessary.
2. Wash sites thoroughly with soap and water. (Never use ether or
pure alcohol, because this increases skin impedance).
3. Rub the skin briskly to increase capillary blood flow in the
tissues and remove skin scurf and grease.
7.3.2 Connecting ECG Cable and Applying Electrodes
To connect the ECG cable and applying electrodes, follow the steps
below:
1. Plug the patient cable into the ECG connector.
2. Attach the snaps to the electrodes prior to placement. Apply
some electrode gel on the electrodes if the electrodes are not
electrolyte self-supplied.