Welch Allyn Acuity Directions For Use Manual page 166

162 Chapter 10 Troubleshooting and maintenance
Problem
When I'm monitoring
a neonate, any
buttons related to
Arrhythmia Analysis
and ST Analysis are
grayed out.
A large number of
irregular rhythm
alarms are occurring.
Explanation
WARNING In Acuity Systems that include an Arrhythmia option, a relearn function
causes the system to learn a patient's normal ECG rhythm. If the system learns an
abnormal rhythm or learns a rhythm during noise, it designates the learned rhythm as
normal. Thereafter, rhythms of this type might not trigger an alarm.
A relearn event can be initiated by a user, or by the system. System relearns are in
response to these circumstances:
•Patient connection
•Lead change or failure
•System restart
During an arrhythmia relearn event, the system posts a RELEARN alert in the patient's
Virtual Monitor and Waveform Window. Carefully observe a patient during an Acuity
System learning period. During learning, the system detects only VFib and asystole
arrhythmias.
After a relearn event, "Relearn" and "Learning Done" event markers (▼) appear in most
of the patient's review windows and some printouts. After relearn, carefully evaluate
the new reference ECG rhythm and the current ST segment for all active leads to
ensure that the system learned an appropriate rhythm. For evaluation instructions, see
"To respond to a RELEARN alert"
WARNING Minimize patient movement during a RELEARN, as movement creates
noise during the reading. If the system learns an abnormal rhythm or learns a rhythm
during noise, it designates the learned rhythm as normal. Thereafter, rhythms of this
type might not trigger an alarm. Ensure that the patient remains still for 5 minutes after
the RELEARN before allowing them to move.
The Arrhythmia Analysis and ST Analysis options are not intended for neonatal patients. When
patient mode is set to Neonate, Arrhythmia Analysis and ST Analysis buttons are disabled.
You can adjust the minimum duration that an irregular rhythm must occur before the Acuity
System alarms for a patient. In the Arrhythmia Alarms Setup window, under Options, click an
arrow to specify up to 120 seconds, and then check the Irregular Limit box.
Welch Allyn Acuity Central Monitoring System
on page 92.