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Technical Description:
a) The fetal heart sound issued by the monitor is not the real fetal heart beating sound, and there is not
much diagnostic value with its sound quality either. Actually, the fetal heart sound issued by the monitor
is the sound signal derived from fetal heart pulse through multiple times of conversion of physical
variables of ultrasound signal and electronic signal, indicating the movement information of fetal heart
beat. This is different from the fetal heard sound heard from a stethoscope.
b) This instrument cannot be used to measure an adult’s heart rate. It is a wrong operation for an operator
to direct the fetal heart rate transducer to the pregnant woman’s heart to verify the measurement
accuracy of the monitor.
c) If the sound is found to be unclear or too low, the transducer position should be adjusted or the earth
wire checked for properly earthing; otherwise the heart rate curve may appear to be scrambled or have
multiple breakpoints.
8.3 Monitoring Twin FHRs
To monitor twin FHRs externally you need two ultrasound transducers. Follow the procedures described in
“8.2.2 FHR Monitoring Procedure” to acquire FHR signals for both channels. When the two US transducers
are fixed, make sure FH sounds from both channels are clear, two FHR traces and two FHR numerics are
displayed on the screen.
NOTE:
To ensure that both transducers stay at the optimum location, each transducer should be fixed with a separate
belt.
Fig. 8-2 Positioning Ultrasound Transducer (twins)
8.3.1 Separating FHR Traces
To help you to interpret traces with similar baselines, you can separate the baselines by an offset of 20 bpm
by switching trace separation on. For details of the offset, see section 6.2 Fetal setting 4) FHR Trace
Separation.
8.4 Monitoring Triple FHRs
To monitor triple FHRs externally you need three ultrasound transducers. Follow the procedures described in
“8.2.2 FHR Monitoring Procedure” to acquire FHR signals for three channels. When the three US
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