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Philips FM20/30 Instructions For Use Manual Page 153

Release j.3 with software revision j.3x.xx patient monitoring.
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Maternal body movement - positioning
Maternal expulsive efforts - pushing
Maternal tachycardia/accelerations with contractions
Fetal decelerations, Fetal tachycardia
Delayed return of the fetal heart rate from a deceleration
Descent of the fetus in the birth canal
Rotation of the fetus in the birth canal
In some cases during the second stage of labor, a good and reliable ultrasound FHR signal may not be
obtainable, and the use of a fetal scalp electrode must be considered (fetal ECG).
Heart Rate Sound
The heart rate sound emitted by the device is a representation of movement that, in most cases,
permits accurate auscultation of the FHR corresponding to the FHR displayed on the monitor and rate
pattern depicted on the trace recording. On occasion, the user may hear a FHR that differs from the
FHR display and the recorded trace. This may occur in situations where the fetal heart moves partly
out of the transducer ultrasound beam. In these cases, the user may hear the FHR emitted from the
monitor's speaker, even though another periodic signal (usually the maternal heart rate) has become
stronger. The auto correlation algorithm will display the stronger maternal heart rate, despite the
persistence of a weaker fetal signal. These occurrences are usually very brief and, if persistent, can be
addressed by repositioning the transducer.
11 Monitoring FHR and FMP Using Ultrasound
153

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