11 Monitoring Twin FHRs
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for FM40/50.
• The trace recorded for FHR1 is thicker (darker) than that recorded for FHR2. This ensures that
the two heart rates are easily distinguishable. The thickness of the recorded trace can be changed in
Configuration Mode.
• Remember that only one fetal heartbeat can be heard from the loudspeaker at any time. The audio
source symbol shows you which fetus you are listening to. To hear the other fetal heartbeat,
select the fetal heart rate sound for this channel (see “Selecting Fetal Heart Sound” on page 99).
• Monitor maternal pulse, especially during later stages of labor, to avoid mistaking maternal heart
rate for FHR.
• Make sure you are recording the best possible signals by referring to the signal quality indicators
and repositioning the transducers if necessary.
Monitoring Twins Externally
To monitor twin FHRs externally you need two ultrasound transducers. Follow the procedures
described in the Chapter “Monitoring FHR and FMP Using Ultrasound” on page 95. The blue
transducer Finder LED lets you identify at a glance which transducer is monitoring which FHR
channel, and lights when you select the FHR numeric field on the screen.
Example of the screen showing ultrasound monitoring of twin FHRs:
1 FHR 1
2 Toco parameter
3 FHR 2
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