16 Monitoring FHR Using DECG
139
Making Connections
WARNING
Follow the instructions supplied with each of the monitoring accessories you are using.
Prepare for DECG monitoring using the list below. The standard procedures in use in your facility
determine the sequence of actions.
• If changing monitoring mode from US to DECG, first disconnect the US transducer.
• Depending on the equipment you are using, ensure that either the Toco
+
transducer or the patient
module is connected to the fetal monitor.
• Attach the fetal scalp electrode to the fetus, following the instructions supplied with the fetal scalp
electrode.
• Attach a pre-gelled attachment electrode to the DECG adapter cable, following the instructions
supplied with the DECG adapter cable.
• Fix the attachment electrode to the mother's thigh, following the instructions supplied with the
attachment electrode.
• Depending on the equipment you are using, connect the red connector plug on the DECG
adapter cable to the red connector on either the Toco+ transducer or the patient module.
• Connect the fetal scalp electrode to the DECG adapter cable.
You are now ready to begin monitoring DECG.
WARNING
The fetal/maternal monitor is not a diagnostic ECG device. In particular, the display of fetal/maternal
ECG is intended only for evaluating signal quality for fetal/maternal heart rate as derived from the
ECG waveform.
When in doubt, it can be used to identify sources of compromised signal quality, such as noise or
muscle artifacts. It can subsequently be used to verify the result of measures taken to resolve them
(e.g., checking ECG cable connections or adapting the fetal
ArtifactSuppress configuration).
The safety and effectiveness of the displayed fetal/maternal ECG waveform (i.e., P, QRS and T
segments) for evaluation of fetal/maternal cardiac status during labor have not been evaluated.
Monitoring DECG
To simultaneously measure DECG and MECG, you need, for instance, a Toco
+
transducer for
DECG, and a patient module for MECG (see “Monitoring Maternal Heart / Pulse Rate” on
page 155). Alternatively, you can monitor the maternal pulse rate via pulse oximetry (see “Pulse Rate
from SpO2” on page 159). You can also monitor maternal pulse with the Toco Pulse transducer.
1 Switch on the recorder.
2 The heart rate monitored via DECG is labeled DFHR1 / DFHR2 / DFHR3 on the screen. If
configured, the DECG wave is displayed automatically on the screen, labeled
DECG. If MECG is
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