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Traditional 510(k) of Fetal & Maternal Monitor
F15 Series Fetal & Maternal Monitor User Manual
Fetal Heart
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 (adjust the volume to medium level and the fetal heart sound can still be
heard clearly). 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
For long-time FHR monitoring, please use a belt to fix the transducer in order to obtain stable fetal
heart signal. 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
T
here are possibilities that maternal heart rate signal is mistaken for FHR signal, so it is
recommended to confirm that the fetus is the signal source continuously. To reduce the possibility
of mistaking the maternal HR for an FHR, you can perform either of the following:
Measure the maternal heart rate with ECG or SpO2 synchronously. 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, such as feeling the arteria carotis and arteriae
radialis and see whether the beating rhythm is the same as the sound rhythm from the
loudspeaker.
If the maternal heart signal is misidentified as the fetal heart signal, repositioning of the
transducer is needed.
NOTE:
1
Do not mistake the high maternal heart rate for fetal heart rate. It is recommended to
monitor maternal heart rate at the same time to distinguish it from fetal heart rate.
2
The best quality records will only be obtained if the probe is placed in the optimum
position. Positions with strong placental sounds or umbilical blood flow sound should be
avoided.
3
If the fetus is in the cephalic presentation and the mother is supine, the clearest heart
sound will normally be found on the midline below the umbilicus. During monitoring, the
patient's prolonged lying in the supine position should be avoided owing to the possibility
of supine hypotension. Sitting up or lateral positions are preferable and may be more
014_14.1_F15_Series_User_Manual
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Fetal Monitoring
Pregnancy
Early Parturition
Late Parturition
96／202
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