Welch Allyn CardioPerfect Workstation Resting ECG Module - User Manual - Manual (Page 28)

CardioPerfect Workstation
Resting ECG Module - User Manual
DIR 80012333 Ver. E 28 / 54
To apply a muscle noise filter:
In the Action menu, click Muscle noise filter.
4.12. Apply AC filter
ECG traces can contain noise that is due to AC mains interference. This makes the traces harder
to read. You can filter out noise by applying an AC filter. When you apply a filter, you do not
change the actual ECG signal. You only change the way it is displayed on the monitor. The ECG
signal always keeps its original form.
To apply an AC filter while you view an ECG:
In the Action menu, click AC filter.
4.13. Apply baseline filter
ECG traces can contain some baseline wander caused by movement. You can reduce this
wander of the baseline by applying a baseline filter. When you apply the baseline filter you only
change the display of the traces. The actual signal remains unchanged.
To apply a baseline filter while you view an ECG:
In the Action menu, click baseline filter.
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 and the filter
settings do not affect the interpretation algorithm.
4.14. Apply anti-aliasing
When you view an ECG on a monitor, the signal can look ragged, especially when you zoom in on
a complex. You can use anti-aliasing to make the signal look smoother. Anti-aliasing does not
change the signal itself. It only affects how the signal is displayed on the monitor.
Before anti-aliasing After anti-aliasing