5-10 170 Series Monitor Revision D
2003023-001
Fetal Heart Rate Monitoring: Fetal Heart Rate Alarms
Latching Alarms
Fetal heart rate threshold alarms are “latching.” This means that a clinician must
acknowledge the alarm using the monitor’s
Alarm Silence button in order to clear the
alarm.
Active Threshold Alarm: Press the Alarm Silence button to cancel the audio
component of an active threshold alarm. The visual indications remains present
until the FHR value returns to within the defined acceptable range.
Unsilenced, Resolved Threshold Alarm: If a threshold alarm condition
resolves, prior to being silenced (clinical acknowledgment), the visual and
audible indications both remain present. Press the
Alarm Silence button to
cancel both the audible and visual indications.
FHR High Alarm
The simplest example of a high FHR alarm occurs when the FHR value is
continuously greater than the threshold (high limit) for 5 minutes. When data
consistently violates the limit, the time-to-alarm is 5 minutes. See
Figure 5-5.
Figure 5-5. High FHR Alarm Example
12
3
4
5
Time (minutes)
FHR (BPM)
high alarm limit
(threshold)
alarm activates
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