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The FHR alarm delay is adjustable between 0 and 300 seconds. If there is a condition to
which attention should be directed, the alarm delay should be set properly.
7.2 Monitoring Twin FHRs
7.2.1 Monitoring Twins Externally
To monitor twin FHRs externally, you need to connect a US transducer to the US1 socket and the
second US transducer to US2 socket of the monitor. Follow the instructions described in Section
7.1 Monitoring FHR with Ultrasound to acquire FHR signals for both channels. Press
CHANNEL button to switch the fetal heart sound from one channel to the other.
When the two US transducers are in place, make sure fetal heart sounds from both channels are
clear. Two FHR traces and two FHR values are displayed on the screen.
NOTE:
To ensure that both transducers stay at the optimal location, each transducer should be fixed with
a separate belt.
7.2.2 Signals Overlap Verification (SOV)
When monitoring twins, there are possibilities that one twin's FHR signal is mistaken for the
other one's signal. The monitor provides a signal overlap verification (SOV) function to reduce
these possibilities.
In the process of monitoring, if the SOV detects signals overlapping, an alarm message "Signals
Overlap (FHR1, FHR2/DFHR)" will appear on the screen to warn you. It may be necessary to
check the patient and reposition the transducers.
7.2.3 Changing FHR2/DFHR Offset
In order to distinguish FHR1 trace from FHR2/DFHR trace, FHR2/DFHR offset is provided to
help you separate the two traces by an offset of -20 bpm or +20 bpm.
To change the FHR2/DECG offset,
1. Select the setup key
2. Select Recorder > FHR2 Offset.
3. Select -20 bpm (default), 0 bpm or +20bpm.
4. Select OK.
This preset FHR2/DFHR offset will be printed on the recorder paper every 10 minutes.
WARNING
on the main interface.
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Chapter 7: Fetal Monitoring
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