10-6 250cx Series Maternal/Fetal Monitor Revision C
2036946-001
Alarms: Fetal Heart Rate Alarms
Fetal Heart Rate Alarms
FHR Patient Alarms
A fetal heart rate patient alarm occurs when any fetal heart rate falls outside of the
pre-defined alarm limits—greater than the high limit setting or less than the low
limit setting.
The FHR alarm function can be completely disabled from the password-protected
Install Options service screen. For this change to take effect, you must cycle power.
Refer to the “250/250cx Series Monitor Service Manual” for more information.
NOTE: The re-alarm time does not apply to FHR alarms—only MECG and
MSpO
2
alarms. FHR values are not configurable.
Active Patient Alarm
A patient alarm is indicated both visually and audibly. The visual indication is
provided by flashing the affected FHR numeric. The audio alarm consists of
alternating high/low tones.
Resolved Patient Alarm
Resolved FHR alarms function differently than other alarms with a 250cx Series
Monitor:
Resolved, Unsilenced FHR Patient Alarm: You must acknowledge an FHR
patient alarm—even if the condition has already been resolved. The visual and
audible indications remain present until you press the
Alarm Silence button.
This ensures that a clinician is aware that an alarm occurred. You may hear this
type of alarm described as latching.
Resolved, Silenced FHR Patient Alarm: If you have already silenced an FHR
patient alarm, the visual indications disappear automatically.
By comparison, the visual and audible indications for a maternal patient alarm
automatically disappear as soon as the condition is resolved—whether or not you
have acknowledged the alarm.
FHR Signal Quality Alarms
A fetal heart rate signal quality alarm occurs if the monitor is unable to detect an
acceptable FHR signal.
Active Signal Quality Alarm
A signal quality alarm is indicated both visually and audibly. The visual indication is
provided by flashing the FHR numeric (if available) or flashing dashes “– – –” in
place of the FHR numeric. The audio alarm consists of alternating high/low tones.
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