User's Manual

8 - 7
4. If more than three ECG waveforms are to be displayed, select the More Leads tab, and then select ECG to
set leads of other ECG waveforms.
For optimal ECG analysis, select leads with the following characteristics:
■ The QRS complex should be either completely above or below the baseline and it should not be biphasic.
■ The QRS complex should be tall and narrow.
■ The P waves and T waves should be less than 0.2mV.
CAUTION
• Ensure that you have selected the optimal leads with the best waveform amplitude and the highest
signal-to-noise ratio. Selecting the optimal leads is important for detecting beats, classifying beats,
and detecting ventricular fibrillation.
8.5.3.2 Changing ECG Waveform Size
If the ECG waveform is too small or clipped, you can change its size by selecting the appropriate Gain setting. To
do so, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Select ECG gain to set the size of each ECG waveform.
4. If more than three ECG waveforms are displayed, select the More Leads tab, and then select ECG Gain to
change the sizes of other ECG waveforms. If you select Auto, the monitor automatically adjusts the size of
the ECG waveforms for all the leads.
8.5.3.3 Changing Va and Vb Labels
When monitoring ECG with 6-leadwire. You can change the labels of Va and Vb leads. To do so, follow this
procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Set Va and Vb according to the locations of the Va and Vb electrode sites. Default settings are Va and Vb.
8.5.3.4 Changing ECG Waveform Speed
To change ECG waveform speed, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Set the desired Speed.
8.5.3.5 Setting the ECG Filter
To set the appropriate ECG waveform filter mode, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Set Filter.
◆ Diagnostic: use when diagnostic quality ECG is required. The unfiltered ECG waveform is displayed so
that changes such as R-wave notching or discrete elevation or depression of the ST segment are
visible.
◆ Monitor: use under normal monitoring conditions.
◆ Surgery: use when the signal is distorted by high frequency or low frequency interference. High
frequency interference usually results in large amplitude spikes making the ECG signal look irregular.
Low frequency interference usually leads to wandering or rough baseline. The surgery filter reduces