Philips Avalon FM20, Instructions For Use Manual

Page: 102 / 221

10 Monitoring FHR and FMP Using Ultrasound
102
Troubleshooting
Problem Possible Causes Solutions
Erratic trace.
Erratic display. Fetal arrhythmia. Consider monitoring FHR using DECG
after the rupture of membranes.
Obese patient.
Transducer position not optimal.
Reposition transducer until signal quality
indicator shows a good signal (at least half-
full).
Belt loose. Tighten belt.
Too much gel. Remove excess.
Very active fetus. -
Insufficient gel. Use enough gel to ensure the transducer
makes good contact with the mother's skin.
Signal quality indicator is
continuously poor. Transducer position not optimal. Reposition transducer until signal quality
indicator shows a good signal (at least half-
full).
FHR less than 50 bpm (and the FHR is
audible). If membranes are ruptured, using a fetal
scalp electrode (FM30 and FM50 only)
allows measurement of FHR down to 30
bpm.
Questionable FHR. Recording MHR by mistake. Reposition transducer.
Confirm fetal life.
Recording periodic signals when the
transducer is not applied to the patient. Disconnect all NON-USED ultrasound
transducers, as continuous, regular
mechanical or electromagnetic influences
can result in an artificial trace.
Recorded FHR appears to be suspiciously
higher, or suspiciously lower, than real FHR.
In very rare cases, half- or double-counting
of the FHR can occur. If you have reason to question the validity of
the recorded FHR, always verify FHR by
independent means (by auscultation, for
example). Measure maternal pulse by
independent means.
FHR not recorded. FHR is less than 50 bpm or over 240 bpm. If membranes are ruptured, using a fetal
scalp electrode (FM30 and FM50 only)
allows measurement of FHR down to 30
bpm.
If FHR is outside of the specified range,
verify FHR by independent means.