User's Manual

Ultraview Care Network
15-8
Channel 2
The monitor is equipped with a second FHR connector to provide simultaneous
monitoring of twins. Both fetuses can be monitored using ultrasound transducers.
Ultrasound transducer preparation and application for the second fetus is the
same as for a single fetus. Volume controls for both channels are located on
screen.
Differentiation of Fetal Heart Rate
To aid in distinguishing twin fetal heart rates, the operator can select one of three
modes for presentation of the fetal heart rate data for the second fetus. The three
modes are:
• FHR2 prints on the same scale as FHR1
• FHR2 prints on a scale 30 bpm below FHR1 (twin shift manual setting)
• FHR2 shifts to a scale 30 bpm below FHR1 when the monitor detects the two
FHRs to be in proximity to each other (auto setting). To differentiate twin
FHRs on the fetal strip chart, the FHR2 trend prints in a light gray compared
to the darker FHR1 trend. When twin fetal heart rates intersect, the FHR2
trend prints dots only, rather than a line, to enhance the distinction between
the two. Finally, the recorder prints HR2 every 10-minutes with a dotted line
pointing to the FHR2 trend. If the 30-bpm offset is activated, the message will
read HR2, Add 30.
Coincidence Recognition
The system has a coincidence recognition feature to detect the same heart rates
between FHR1 and FHR2 over a period of time. When a coincidence is
suspected, the monitor prints a question mark (?) on the strip chart to notify the
clinician.
!
• Make sure that both transducers are not directed at the same
fetus. Review the information on Differentiation of Fetal Heart
Rate on page 15-8 and Coincidence Recognition on page 15-8.
!
• Once shifted, FHR2 will remain on this alternate scale until the
monitor detects a consistent pattern of baseline separation
between the two fetal heart rates. In many cases, this alternate
scale may remain in effect throughout the delivery.
!
• If these marks appear, the FHR1 and FHR2 signals may be
from the same fetus. Re-check the ultrasound transducer
positions. If necessary, reposition the transducers to capture the
fetal heart rates from different fetuses.
• This detection may not occur if channel 1 is in ECG mode and
channel 2 is ultrasound, because of the difference in signal
processing.
• This detection may not occur if one or both of the ultrasound
channels have a poor signal quality.
To set the twin FHR shift:
1 Touch the SETUP key on the
main fetal menu.
2 Touch the TWIN SHIFT key.
3 Select MANUAL, AUTO, or NO
SHIFT mode.