16 Monitoring FHR Using DECG
140
being monitored, both waves are displayed, with the DECG wave above the MECG wave. The
MECG wave is labeled
MECG.
3 Check the artifact suppression setting and change it if necessary (see “Suppressing Artifacts” on
page 140).
WARNING
Periodically compare the mother's pulse with the signal coming from the monitor's loudspeaker to
ensure that you are monitoring fetal heart rate. If the MHR coincides with the FHR, do not
misinterpret the MHR as the FHR (see also “Confirm Fetal Life Before Using the Monitor” on
page 10). When you monitor MHR simultaneously with FHR, cross-channel verification (CCV) warns
you of this possibility.
Suppressing Artifacts
When the monitor's artifact suppression is on, instantaneous heart rate changes of 28 bpm or more,
however caused, are not recorded. Fetal arrhythmia will also be suppressed. If you suspect fetal
arrhythmia, switch artifact suppression off. When artifact suppression is off, all recorded fetal
heartbeats within the specified range are shown. The default setting is
On (artifacts are suppressed).
To change the setting:
1 Enter the Setup DFHR1 menu.
2 Select ArtifactSuppress to toggle between artifact suppression On (artifacts are suppressed) and
Off (no artifact suppression, use this setting if you suspect fetal arrhythmia).
When artifact suppression is off,
Artifact Suppression Off is annotated on the trace recording.
Printing the Waveform
You can print the DECG wave onto the trace paper. Please refer to “Printing the ECG Waveform” on
page 161.
1 Measurement label (DFHR1)
2 Measurement label (Toco)
3 Additional measurement label
(FHR2)
4 Numeric/measurement values
5 MECG wave
6 DECG wave
7 Noninvasive blood pressure
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