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Instructions For Use
EN
Stethoscopy should be applied when sudden changes in baseline are detected.
If the amniotic membrane rupture and cervical dilatation are sufficient, consider using a
spiral electrode to obtain precise FHR with direct fetal ECG as the signal source.
(4) Erratic Traces / Drop out
When the fetal heart moves partially out of the ultrasound wave path, the transducer
receives mixed or weak signals, and thereby the monitor presents erratic traces. When
the fetal heart moves fully out of the path, inadequate consecutive and periodic signals
are received, and no trace is represented.
Erratic traces and transitory episodes of drop out are common, especially when the
fetus or/and mother move(s). If they exist for an extended period, it indicates that the
transducer is not aimed at the fetus. Repositioning of the transducer is needed.
