Ultrasound (External Method); Methodology; Us/Us2 Setup Screen; Volume - GE Corometrics 250cx Series Operator's Manual

Ultrasound (External Method)

Methodology

US/US2 Setup Screen

Applicable Spectra
alerts can appear in
this area

Volume

Revision C
Fetal Heart Rate Monitoring: Ultrasound (External Method)
NOTE: Refer to the "Maternal/Fetal Monitoring, Clinical Applications Manual"
for patient application information.
An ultrasound (US/US2) transducer placed on the maternal abdomen is used to
direct an ultrasonic beam toward the fetal heart; the transducer detects Doppler
shifted frequency changes in echoes created by moving cardiac structures. An
autocorrelation process is used to determine the time interval between successive
cardiac cycles.
The fetal heart rate is displayed in bpm and is continuously plotted on the strip chart
paper if the recorder is on. (Refer to the "US/US2 Setup Screen" figure below.) The
heartbeat indicator flashes for each detected heartbeat.
Select the US or US2 softkey to access the US/US2 Setup screen below. The title of
the screen (US vs. US2) is dependent on the mode selected when the screen is
activated.
US
120
FM Detect: Off
Volume: 5
Alert: On
Trend
This field adjusts the volume for the FHR derived from the selected mode, US or
US2. This field works in conjunction with the front panel
250cx Series Maternal/Fetal Monitor
2036946-001
US2
120
US Setup
Alert Suspend: Off
Volume 5
IUP
20
Exit
US/US2 Setup Screen
Volume
buttons.
5-3