Welch Allyn Acuity and Mobile Acuity LT Central Monitoring Systems - User Manual - Manual (Page 67)

Directions for use Chapter 4 Adjust monitoring settings and patient information 63
Initiate relearn of a patient’s ECG rhythm
Description of the relearn function
Relearn is an Arrhythmia Analysis function that causes the Acuity system to relearn a
patient’s normal ECG rhythm. The Acuity System uses the relearned rhythm as a guideline
to identify arrhythmia events (arrhythmia relearn) and to analyze deviation of the
ECG ST-segment offset (ST relearn).
When relearn occurs for a patient
Both arrhythmia and ST relearn events occur after these things:
• ST/Arr Relearn is clicked in the Arrhythmia Alarms Setup window.
• Single ECG is clicked in the Arrhythmia Alarms Setup window
• Patient connection, some lead changes or lead failures, system restart
Only an arrhythmia relearn event occurs after these things:
• RELEARN is clicked in the Arrhythmia Alarms Setup window. A RELEARN button
(instead of an ST/Arr Relearn button) indicates that the system does not include
the ST Analysis option.
• Analyze Pacers is clicked in the Arrhythmia Alarms Setup window. ST Analysis is
disabled when Analyze Pacers is enabled.
What occurs in a patient’s windows during and after a relearn event
• Virtual Monitor and Waveform Window: A visual RELEARN alert occurs, HR is taken
from the patient monitor instead of from the arrhythmia software, and real-time
waveforms display as usual.
• ST Analysis Setup window: The waveform slice displays NO VALID BEATS, and the
Acuity System can take up to 30 seconds to update the waveform.
• Most review windows and some printouts: Relearn and Learning Done event markers
(
▼) appear.
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.