Signal Quality Alarms
Active Signal Quality Alarm
Resolved Signal Quality Alarm
100% Signal Loss
5-12
Fetal Heart Rate Monitoring: Fetal Heart Rate Alarms
A fetal heart rate signal quality alarm occurs if the monitor is unable to detect an
acceptable FHR signal.
Signal quality alarms are indicated both visually and audibly. The
illuminates and dashes "– – –" display in the affected fetal heart rate display.
The audio alarm is described as alternating high-low tones.
As soon as an alarm condition is resolved, both the visual and audible indications
automatically disappear.
In cases where there is a complete absence of signal, the signal quality time-to-alarm
is 1.25 minutes. See
Figure
FHR (BPM)
1
Figure 5-8. 100% Signal Loss Example
170 Series Monitor
2003023-001
5-8.
100% signal loss
1.25 min
alarm activated
3
4
5
2
Alarm
indicator
Time (minutes)
Revision D