GE Corometrics 250cx Series Operator's Manual page 231

ALERT PARAMETERS SUMMARY ON FHR SETUP SCREEN
Parameter Column 1
Decelerations
Present?
Present?
Artifact/Arrhythmia Present
Revision C
Spectra Alerts: Alert Parameters
Summary of Alert Parameters
Column 2 Message
DECELERATIONS?
DECELERATIONS?
250cx Series Maternal/Fetal Monitor
2036946-001
TREND SCREEN
Criteria
The analysis of deceleration characteristics
has recognized features of either variable,
late, mixed, or prolonged decelerations; or
decelerations without uterine activity
recorded. The baseline FHR and variability
impact the monitor's ability to analyze
patterns, as well as the "severity" of the
pattern. The monitor attempts to integrate
the baseline features with the deceleration
features (onset, size, duration, etc.) to
determine when to alert. The alert message
is issued on the basis of 1, 2, or 3
decelerations depending on the size, shape,
onset, duration, etc. and related baseline
rate and variability.
Examples: An alert occurs when:
Three out of 5 contractions have mild
variable decelerations; if baseline FHR is in
normal range; and variability is average.
Two out of 5 contractions have any
decelerations (except early) if the variability
decreased.
One severe variable deceleration that drops
to < 60 bpm for > 60 seconds. NOTE: Alert
occurs in approximately 2 minutes.
Alert silenced.
The alert is deleted when there are 4
contractions without a deceleration; or 10
minutes without decelerations if no uterine
contractions are present.
No alert. 5% of data in last minute may be
PVCs, other arrhythmias, or artifact.
C-19