Welch Allyn CardioPerfect Workstation Exercise ECG Module - User Manual - Manual (Page 23)

CardioPerfect Workstation
Exercise ECG Module - User Manual
DIR 80012335 Ver. E 23 / 83
2.3.7. Apply filters
Baseline filter
ECG traces can contain baseline wander that disturbs the signal. You can use the baseline
filter to filter out this disturbance. When you use the baseline filter, the recorded signal is not
changed. You only change the way the signal is displayed and printed.
To filter out baseline wander during recording:
In the Real-time monitor, check the Baseline option in the Overview area or press F3. The
filter is immediately applied. Clicking the button once more switches the filter off.
Alternatively, in the Action menu, click Baseline to switch on the Baseline filter.
Clicking the option once more switches the filter off.
The baseline wander filter introduces a delay of 3 seconds before data are shown on the real-
time display.
To filter out baseline wander during viewing:
In the Action menu, click Baseline to switch on the Baseline filter. Clicking the option
once more switches the filter off.
Note: If accurate ST segment contours are required for ECGs, do not use the 0.5 Hz
baseline wander filter. This filter suppresses baseline wander to the extent that it may
alter the ST segment. Instead, configure your cardiograph to operate without the
baseline wander filter. Regardless of the filter used, the rhythm characteristics of the
ECG are accurately recorded.
Muscle noise filter
Muscle noise in an ECG signal hides low amplitude signals that may be important for the
interpretation of an ECG. You can remove this noise with a muscle noise filter.
To apply a muscle noise filter:
At the top of the Real-time monitor, click Muscle filter. Click again to switch the filter
off.
2.3.8. Manual load change
During recording, it is possible to change the load by clicking the 'Change load' button.
Clicking this button will open the
„change load‟ dialog window which is always on top.
If a treadmill is used the speed and elevation can be changed, if an ergometer is used the
workload can be changed.
When the „pause the protocol after change‟ option is enabled, the protocol will hold at the
current load. The pause protocol checkbox is linked to the pause button on the monitor form.
Clicking either one of them will automatically change the state of the other one.
New values can be entered directly or via the up/down buttons. It is also possible to
increment/decrement the value by using dedicated keyboard keys, see table.