fetatrack 360, Руководство пользователя

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f etatrack 360is issue 1 13
FETAL HEART RATE MONITORING
ULTRASOUND
The FETATRACK 360 ultrasound transducers are used to detect the fetal heart beat.
The transducer plugs are colour coded for ease of identification.
To monitor the first heart rate push the transducer (pink) plug firmly into the pink
front panel US1 socket and turn the FETATRACK 360 on. The second heart rate
channel may be used simultaneously to monitor twins externally by connecting the
second ultrasound transducer (blue) to the US2 (blue) socket.
Locate a clear fetal heart sound using a Doppler Fetal Heart Detector
(FETATRACK 120 or simular). Secure the stretch belt in position, so that it passes
over the transducer site and clamp in place with the buckle. Apply a liberal amount
of coupling gel to the transducer face and slide the transducer onto the belt, locating
it approximately in the position determined by the Doppler detector. Ensure that the
belt tension is sufficient to hold the transducer in good contact with the abdomen.
Since the transducer is free to slide on the belt final positioning can now be made to
obtain the clearest heart sound. The heart rate processor will start to calculate heart
rate within a few seconds and the heart rate can be observed on the digital display.
Correct operation can be verified by observing that the heart shaped fetal pulse lamp
is flashing at the heart rate.
The fetal pulse lamp is also used as a signal quality indicator. When positioning the
transducer observe the shape, which should be solid under best signal conditions. If
heart is hollow, this is an indication that the signal quality is not at its optimum.
Improved recordings can be obtained by repositioning the transducer so that the
heart flashes solid.
When the fetal pulse heart changes to hollow a black dot or line is marked on the
recording for the time that signal quality remains low. No mark is made in the
absence of signal, or when signal quality is adequate for correct positioning. Low
signal quality is marked on the lower edge of the fetal heart rate scale for US1 and
at the top edge of the scale for US2.
The audio volume can be increased or decreased by pressing the appropriate volume
control button once a clear fetal heart signal has been located.
When monitoring twins it is possible to listen to either the US1 or US2 signal by
pressing the Audio Selector switch. The display will indicate the selected channel.
Turn the printer on and observe that the digital display of fetal heart rate (FHR) and
chart record are in agreement, taking into account that the recording is a few
seconds behind the display.
Transducer position should be checked at least half-hourly during labor monitoring
or prolonged NST. When repositioning the transducer, further coupling gel may be