Cadence II Fetal Monitor Service Manual
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Chapter 5 Monitoring
5.1 Ultrasound Monitoring of FHR
The ultrasound monitoring is a method to obtain FHR through maternal abdominal wall.
Put the FHR transducer on maternal abdomen to transmit lower energy ultrasound wave
to fetal heart, then receive the echo signal from it.
Ultrasound monitoring can be used for antepartum monitoring.
Parts Required
① Ultrasound transducer ② Coupling gel ③ Belt
Operation Procedure
① Preparing the Monitor
Turn the monitor on and verify that the normal monitoring screen appears on the display.
Check the ultrasound transducer to verify proper attachment to the monitor. For twins
monitoring, make sure the second ultrasound transducer is properly connected.
Set the current heart rate channel to US1, and adjust US1 speaker volume well.
Attach the buckle of the ultrasound transducer to the belt.
Apply aquasonic coupling medium to the face of the transducer.
② Acquiring the Fetal Heart Signal
Determine the location of the fetal heart using palpation or a fetoscope.
Place the ultrasound transducer on the abdomen over fetal site and move it slowly until
the characteristic hoof-beat sound of the fetal heart is heard.
The elasticity of belt can be adjusted, which make the pregnant woman monitored in the
comfortable situation, and the fetal heart rate value and trend will be showed in the
screen.
Acquiring Twins’ Heart Rates Signal③
Follow the step ② mentioned above to acquire the heart rate for the first fetus.
Set the current heart rate channel to US2, and adjust US2 speaker volume well so that
the second heart sounds can be heard.
Apply aquasonic coupling medium to the face of the transducer.
Determine the location of the second fetal signal using palpation or fetoscope.
Place the second ultrasound transducer on the abdomen over fetal site and move it
slowly until the characteristic hoof-beat sound of the second fetal heart is heard.
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