F9, F9 Express Fetal & Maternal Monitor User Manual Fetal Monitoring
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above the navel for breech presentation.
During parturition, the fetal heart moves downward as the labor progresses. It is
recommended to move the transducer along with the fetus.
Figure 7-1 Positioning Ultrasound Transducer (single fetus)
c) Acquiring Fetal Heart Signal
Apply a certain amount of acoustic gel on the transducer and move the transducer slowly
around the fetus site to even the gel. The best fetal heart signal can be obtained through the
fetal back. Find at least 2 or 3 sites, and choose the one where the clearest, most sonorous
and steady fetal heart sound is heard. When the transducer is connected correctly and
communicated well, the fetal heart signal indicator is full. If the signal is poor, the signal
indicator shows as it is and no FHR data are displayed. When you move the transducer on the
abdomen, adjust the speaker volume so that it can be clearly heard.
d) Fixing the Transducer
When you find clearest and most steady fetal heart sound, wrap the abdomen with the belt
over the transducer. Fix the transducer by pushing its buckle through the overlapping section
of the belt.
Make sure the belt fits the patient snugly but comfortably. Meanwhile, fetus heart beat sound
is heard; the FHR trace and numeric are displayed. During long-time monitoring, the gel may
dry out as the transducer moves around. Add more gel in time if it is inadequate.
e) Confirming that the Fetus is the Signal Source
Ultrasound Doppler technology is utilized to observe the fetal heart rate externally when
there are possibilities that maternal heart rate signal is mistaken for FHR signal. It is highly
recommended to confirm that the fetus is the signal source continuously. You can perform
either of the following:
Measure the maternal heart rate with ECG or SpO2 synchronously (available on F9
Express monitor). The monitor‟s SOV function can issue an alarm when the FHR signal
source is likely to be from the maternal heart.
Feel the maternal pulse at the same time.
Pregnancy
Early Parturition
Late Parturition
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