Monitoring Fetal Heart Rate; Electromagnetic Interference - Medical Econet Ecotwin Lcd Bedienungsanleitung

ECOtwin LCD / LED
Section 7

Monitoring Fetal Heart Rate

Electromagnetic Interference

Certain strong electromagnetic fields can interfere with the ultrasound transducer and cause a false
heart rate reading that does not originate from the patient. This interference is rare, and usually
found in the vicinity of large machinery. In order to avoid the possibility of these interfering signals
being misinterpreted as fetal heart rates, the following procedure should be followed whenever the
monitor is to be used in a new location, or if it is known that electrical machinery is being operated
in the vicinity.
After connecting the ultrasound transducer(s), turn on the monitor and observe the heart rate
indications on the screen for 30 seconds. Intermittent display of random heart rates is acceptable.
However, if there is a constant display of a physiological heart rate lasting more than 5 seconds, this
is an indication that there is a source of electromagnetic interference in the vicinity. The following
steps should be taken to determine if it is possible to use the monitor in this environment.
 Move all line cords and line-powered equipment at least 6 feet away from the ECOTWIN.
Check for extension cords running behind or under the bed and equipment in adjacent rooms. If
the artifact heart rate indication ceases, the monitor may be used normally.

Remove the line cord from the monitor's power supply. If the artifact heart rate indication
ceases, the monitor may be used normally.
If these measures do not result in cessation of the heart rate artifact, the monitor cannot be safely
used in this environment.
Fetal heart rate is measured by placing an ultrasound transducer on the maternal abdomen and by
processing the Doppler echo signal to produce a heart rate and an audio representation of the echo
signal.
CAUTION
During the using ECOTWIN, we do not intend that the cable of DOP sensor contacts to

the patient. To prevent that the cable contacts to the patient, please cover the patient's
abdomen section which have a possibility of contacting by the cable with cleaned gauze or
fabric.
User manual
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