Mindray BeneView T8, Operation Manual

Page: 84 / 290

Monitoring ECG/Resp
7-10
7.5.4 Changing the ECG Filter Settings
The ECG filter setting defines how ECG waves are smoothed. Filter settings do not affect ST
measurement. To change the filter setting, select [
Filter
] from [
ECG Setup
] and then select
the appropriate setting.
„ [
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,
select [
Surgery
] may suppress the QRS complexes too much and then interfere with
ECG analysis.
WARNING
z
The [Monitor] or [Surgery] filter may cause ECG waveform distortions and affect
ST analysis, and the [Surgery] filter may affect arrhythmia analysis. Therefore, the
[Diagnostic] filter is recommended when monitoring a patient in an environment
with slight interference only.
7.5.5 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.
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.
3. When [
Notch Filter
] is set on, select [
Main Menu
] → [
Maintenance >>
] → [
User
Maintenance >>
]
→
enter the required password.
4. Select [
Others >>
] → [
Notch Freq.
] and then select [
50Hz
] or [
60Hz
] according to the
power line frequency.