User's Manual

F Series Fetal & Maternal Monitor User Manual Fetal Monitoring
- 62 -
7.4.2 Monitoring Internally
Alternatively, you can monitor a FH using ultrasound externally, and monitor the second FH
using DECG internally.
Connect the US transducer to US2 socket; connect DECG cable to DECG socket.
Monitor one twin with a US transducer using the procedures described in Section 7.2 Monitoring
FHR with Ultrasound.
Monitor the other twin with a DECG cable using the procedures described in Section 7.3
Monitoring FHR with DECG.
CAUTION
The US transducer must be connected to US2 socket. If the US transducer connects to
US1 socket while DECG cable is connected to DECG socket, the FHR trace and
numeric from US1 will not be displayed.
7.4.3 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 signals 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/DFHR, FHR2)” will appear on the screen to warn you. Checking the patient and
reposition of transducers might be needed.
7.4.4 Changing FHR2 Offset
In order to distinguish FHR1/DFHR trace from FHR2 trace, FHR2 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 on the main interface.
2 Select Recorder > FHR2 Offset.
3 Select -20 bpm (default), 0 bpm or +20bpm.
4 Select OK.
This preset FHR2 offset will be printed on the recorder paper every 10 minutes.