8-9
When [
ECG Display
] is set to [
Normal
] and [
Sweep Mode
] is set to [
Refresh
], cascaded
ECG waveforms can be displayed. To cascade ECG waveforms:
1. Select either ECG wave to enter its lead menu.
2. Select
[
Cascade
] and then select [
On
]. A cascaded waveform is displayed in two
waveform positions.
8.5.4 Changing the ECG Filter Settings
The ECG filter setting defines how ECG waves are smoothed. The default filter mode is
different for different departments. To change the filter mode which will be applied for all
ECG waveforms, select either ECG wave to enter its lead menu and then set [
Filter
] to:
[
Monitor
]: Use under normal measurement conditions.
[
Diagnostic
]: Use when diagnostic quality is required. The unfiltered ECG wave is
displayed so that changes such as R-wave notching or discrete elevation or depression
of the ST segment are visible.
[
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. In the operating room, the surgery filter reduces artifacts
and interference from electrosurgical units. Under normal measurement conditions,
selecting [
Surgery
] may suppress the QRS complexes too much and then interfere
with ECG analysis.
NOTE
z
As the [Monitor] or [Surgery] filter may cause ECG waveform distortions, try to
use the [Diagnostic] filter for ST analysis as possible as you can. Besides, the
[Surgery] filter may also affect arrhythmia analysis results.
8.5.5 Switching the Notch Filter On or Off
The notch filter removes the line frequency interference. When [
Filter
] is not set to
[
Diagnostic
], the notch filter always stays on. When [
Filter
] is set to [
Diagnostic
], you can
switch the notch filter on or off as required.
1. Select the ECG parameter window to enter its setup menu and then select [
Others >>
].
2. Select
[
Notch Filter
] and toggle between [
On
] and [
Off
]. Switching the notch filter on
is recommended when there is interference (such as spikes) with the waveform.
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