F15 Series Fetal & Maternal Monitor User Manual Fetal Monitoring
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7.5 Monitoring Triple FHRs
7.5.1 Monitoring Triplets Externally
To monitor triple FHRs externally, you need to connect three US transducers to fetal monitoring socket
of the monitor. Follow the instructions described in Section 7.2 Monitoring FHR with Ultrasound to
acquire FHR signals for three channels. Press CHANNEL key to switch the FH sound from one
channel to another.
When the three US transducers are fixed, make sure FH sounds from three channels are clear, three
FHR traces and three FHR numerics are displayed on the screen.
NOTE:
To ensure that the transducers stay at the optimum location, each transducer should be fixed with a
separate belt.
7.5.2 Monitoring Internally
Alternatively, you can monitor two FHs using ultrasound externally, and monitor the third FH using
DECG internally.
Connect the two US transducers and DECG Fetal&Maternal Module to fetal monitoring sockets.
Monitor two of the triplets with two US transducers using the procedures described in Section 7.2
Monitoring FHR with Ultrasound.
Monitor the last triplet with a DECG Fetal&Maternal Module using the procedures described in Section
7.3 Monitoring FHR with DECG.
7.5.3 Signals Overlap Verification (SOV)
When monitoring triplets, there are possibilities that one of the triplets’ FHR signal is mistaken for the
rest two’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)”, “Signals Overlap (FHR2, FHR3)” and “Signals Overlap (FHR1/DFHR,
FHR3)”will appear on the screen to warn you. Checking the patient and reposition of transducers
might be needed.
WARNING
1 Though SOV alarm function helps to detect the overlap of FHR1/DFHR and FHR2, FHR2
and FHR3, FHR1/DFHR and FHR3 automatically, do not rely solely on it to judge the fetal
heart signal overlap. As in the process of actual monitoring, the movement of transducer
and fetus, detecting MHR by mistake, interference of fetal movement and maternal
movement can cause fetal heart signal weak and loss, and magnified error of fetal heart
calculation led by poor signal. In these situations, SOV alarm function can not totally
identify the signal overlap, so user needs to observe FHR1/DFHR trace and FHR2 trace, or
FHR2 trace and FHR3 trace, or FHR1/DFHR trace and FHR3 trace simultaneously to help
the judgment and adjust the transducer to the optimal position in time.
7.5.4 Changing FHR3 Offset
In order to distinguish FHR1 trace from FHR2 and FHR3 trace, FHR3 offset is provided to help you
separate the three traces by an offset of -20 bpm or +20 bpm.
To change the FHR3 offset,
1 Select the main menu key on the main interface.
2 Select Recorder > FHR3 Offset.
Traditional 510(k) of Fetal & Maternal Monitor
014_14.1_F15_Series_User_Manual
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