10 Monitoring FHR and FMP Using Ultrasound
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WARNING
Periodically compare the mother's pulse with the signal coming from the monitor's loudspeaker to
ensure that you are monitoring fetal heart rate. Do not mistake a doubled or elevated MHR for FHR.
Note that when applied to the patient, the ultrasound transducer may warm slightly (less than 1°C/
1.8°F above ambient temperature). When NOT applied, the transducer can reach a maximum
temperature of 44°C/112.2°F at an air temperature of 40°C/104°F.
Selecting Fetal Heart Sound
You can listen to the fetal heart sound from one ultrasound transducer at a time. When the fetal heart
sound is selected for a FHR channel, you see the audio source symbol next to the FHR numeric
label for that channel.
To select the audio source for a FHR channel:
Enter the
Setup FHR1 menu for the channel you want to hear (FHR1 used as an example).
Press
Select Audio. It may take a few seconds for the audio source symbol to appear.
Changing the Fetal Heart Sound Volume
The FHR volume symbol at the top right of the Fetal Heart Sound Volume window gives you an
indication of the current volume. To change the volume:
1 Select the volume symbol . The volume scale pops up.
1 FHR1
2 Audio source symbol
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