6 ECG, Arrhythmia, ST and QT Monitoring
110
Changing the Volume of the QRS Tone
The QRS tone is derived from either the HR or Pulse, depending on which is currently selected as the
alarm source. The QRS volume can be set from 0 to 10 (0 means off).
To change the QRS volume, in the
Setup ECG menu select QRS Volume and then select the appropriate
volume from the pop-up list.
Changing the ECG Filter Settings
The ECG filter setting defines how ECG waves are smoothed. An abbreviation indicating the filter
type is shown underneath the lead label on the monitor display. Filter settings do not affect ST
measurement.
To change the filter setting, in the
Setup ECG menu, select Filter and then select the appropriate setting.
–
Monitor: Use under normal measurement conditions.
–
Ext. Monitor: Use when diagnostic quality is required but low frequency interference or a
wandering baseline may be expected. The upper edge frequency is the same as the
Diag setting
and the lower edge frequency is the same as the
Monitor setting.
–
Filter: The filter reduces interference to the signal. It should be used if 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 a wandering or rough baseline. In the operating room, the Filter reduces
artifacts and interference from electrosurgical units. Under normal measurement conditions,
selecting
Filter may suppress the QRS complexes too much and thus interfere with the clinical
evaluation of the ECG displayed on the monitor. This does not affect the ECG analysis
performed by the monitor.
If
AutoFilter is set to On in Configuration Mode, the filter setting will automatically be set to
Filter if electromagnetic interference is detected.
–
Diag: 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 segments are
visible.
The setting
Diag selects the highest available ECG bandwidth which is 0.05 to 150 Hz for the
Adult, Pedi and Neo patient category. The term "diagnostic" relates only to the ECG
bandwidth requirements for diagnostic electrocardiographic devices as outlined in the ANSI/
AAMI standard EC11-1991.
When you are using a telemetry transmitter connected via short range radio to the monitor,
the upper bandwidth for all filter settings is limited to 40 Hz.
Choosing EASI or Standard Lead Placement
You must enable either standard lead placement or EASI lead placement.
•In the
Setup ECG menu, select Placement and then Standard or EASI.
EASI is shown beside the 1mV calibration bar on the ECG wave on the display, and EASI is marked on
any printouts.
See the section on “EASI ECG Lead Placement” on page 122 for electrode placement diagrams.
To Next Page
Loading...