10 Monitoring FHR and FMP Using Ultrasound
103
Additional Information
Artifact in Fetal Heart Rate Measurement
How to detect it and reduce its occurrence using the Avalon Fetal Monitor
The ultrasound derived FHR measurement technique in Avalon fetal monitors, like all other
ultrasound fetal monitors’ FHR measurement techniques, has limitations that can lead to
misrepresentation of the fetal heart rate pattern and potential misinterpretation of the fetal condition.
An incorrect interpretation of the trace may lead to either unnecessary interventions or to failure to
detect fetal distress and the need for intervention. Therefore, the on-going evaluation of the recorded
trace requires regular confirmation that the trace represents true FHR. Specific situations requiring
such confirmation include the following:
♦
After starting a measurement or changing a transducer
♦
After maternal position changes, for example during pushing with contractions
♦
When the tracing shows abrupt changes in baseline rate, variability, or pattern (decelerations to
accelerations) especially in the second stage of labor
♦
When the baseline maternal heart rate is within about 15 bpm of the FHR
♦
When the user is unable to determine a baseline rate and variability occurs between consecutive
contractions
There are several ways to verify the source and/or accuracy of the recorded fetal heart rate pattern.
These include:
Verification of the FHR with:
♦
An obstetric stethoscope,
♦
Ultrasound imaging, or
♦
A fetal scalp electrode
Verification of the maternal heart rate:
♦
Using pulse oximetry - for a maternal heart rate pattern displayed simultaneously with the FHR
(Cross-Channel Verification (CCV) feature),
♦
Using Maternal ECG - for a maternal heart rate pattern displayed simultaneously with the FHR
(CCV feature), or
♦
Manual determination of the maternal pulse
FHR1 EQUIP MALF
or
FHR2 EQUIP MALF
or
FHR3 EQUIP MALF
INOP
displayed.
(see “Patient Alarms and INOPs” on
page 73).
FHR1 SIGNAL LOSS
or
FHR2 SIGNAL LOSS
or
FHR3 SIGNAL LOSS
INOP displayed.
FHR1 UNPLUGGED
or
FHR2 UNPLUGGED
or
FHR3 UNPLUGGED
INOP displayed.
If you suspect the transducer is malfunctioning.
Test the transducer. See below.
Problem
Possible Causes
Solutions
Содержание Avalon FM20
Страница 2: ......
Страница 8: ...8 ...
Страница 56: ...3 Basic Operation 56 ...
Страница 72: ...5 Alarms 72 ...
Страница 82: ...6 Patient Alarms and INOPs 82 ...
Страница 86: ...7 Admitting and Discharging 86 ...
Страница 90: ...8 Non Stress Test Timer 90 ...
Страница 120: ...11 Monitoring Twin FHRs 120 ...
Страница 126: ...12 Monitoring Triple FHRs 126 ...
Страница 136: ...15 Monitoring Uterine Activity Internally 136 ...
Страница 142: ...16 Monitoring FHR Using DECG 142 Testing DECG Mode Refer to the monitor s Service Guide ...
Страница 154: ...18 Monitoring SpO2 154 ...
Страница 164: ...20 Printing the ECG Waveform 164 ...
Страница 166: ...21 Paper Save Mode for Maternal Measurements 166 ...
Страница 170: ...22 Recovering Data 170 ...
Страница 174: ...23 Care and Cleaning 174 ...
Страница 188: ...25 Accessories and Supplies 188 ...
Страница 216: ...26 Specifications and Standards Compliance 216 ...
Страница 221: ...Part Number 453564290161 Printed in Germany 08 11 453564290161 ...