User's Manual

Table Of Contents
8 - 8
artifacts and interference from electrosurgical units. Under normal measurement conditions,
selecting Surgery may suppress certain features or details of the QRS complexes.
ST: recommended for ST monitoring.
8.5.3.6 Switching On or Off the Notch Filter
The notch filter removes the line frequency interference. To switch on or off the notch filter, follow this
procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Switch on or off Notch Filter.
NOTE
The notch filter can only be switched on or off when ECG Filter is set to Diagnostic. In other filter
modes, the notch filter is always on.
8.5.4 Disabling the Smart Lead Off Function
The monitor provides the smart lead off function. When the lead corresponding to the first ECG wave gets
detached but another lead is available, the monitor automatically switches to the available lead to recalculate
heart rate, and to analyze and detect arrhythmias. When you reconnect the detached leads, the monitor
automatically switches back to the original lead.
The smart lead off function is enabled by default. To disable this function, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Switch off Smart Lead.
8.5.5 Adjusting the QRS Volume
To adjust the QRS volume, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab.
3. Set QRS Volume.
When valid SpO
2
measurements are available, the monitor adjusts the pitch of QRS tone based on the SpO
2
value.
8.5.6 Adjusting the Minimum QRS Detection Threshold
To avoid false asystole alarm due to low R wave amplitude, and to avoid tall T waves and P waves being mistaken
for QRS complexes, the monitor provides a means to manually adjust the minimum QRS detection threshold.
To adjust the minimum QRS detection threshold, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG dialog.
2. Select the Setup tab and set Filter to Monitor.
3. Select the QRS Threshold tab.
4. Select up or down arrow buttons to adjust the minimum threshold for QRS detection. Selecting Default
resets the QRS threshold to the default value (0.16 mV).
CAUTION
The setting of the QRS detection threshold can affect the sensitivity for arrhythmia, ST, QT/QTc
detection, and heart rate calculation.