Ultrasound Technologies Fetatrack 310, Руководство по обслуживанию

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Ultrasound Technologies Ltd
Operating Procedures
Fetatrack310 Service Manual Issue3 Page 12
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Transducer Belts
Both the ultrasound and contractions transducers are held in position with elastic
belting which maintains the active elements in contact with the abdomen. The belts
should first be placed around the patient and held in place at the correct tension with
the plastic buckles. As the transducers are free to slide on the belt final positioning
can be easily achieved. Similarly repositioning of the transducers is made very much
simpler.
Interpretation
The following is intended only as a brief guide. For a fuller explanation of the
interpretation of chart records, refer to suitable reference books.
During the antepartum period the Non Stress Test (NST) is an accurate means
of predicting fetal well-being. The criteria proposed by Schifrin et al for the
interpretation of the NST is summarised.
Reactive - accelerations of 15 BPM or more which last for 15 seconds or longer
twice in any 10 minute period. These may be accompanied by fetal activity.
Non-reactive - evidence of fetal movement during a forty minute period, but without
the reactivity indicated above.
Unsatisfactory - recording quality too poor to determine the above criteria.
Stimulation of the fetus, or repositioning of the transducers may result in an improved
recording.
Results from the NST may indicate the requirements to perform other diagnostic
checks such as the Contractions Stress Test (CST).