ECG, arrhythmia, and ST segment
236 Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
Learning/relearning QRS pattern
The M540 creates a reference template by learning
the dominant QRS pattern of a patient. The
reference template is stored for reference and all
subsequent beats and rhythms are compared
against it and classified either as normal or
irregular.
The M540 can only learn the QRS pattern of the
leads that are selected for arrhythmia processing. If
only one lead is available, the M540 only learns on
one lead. If no lead set is connected, the M540
cannot perform a learning phase. In this case, an
error message is displayed.
The M540 starts a learning phase automatically
when:
– Exiting discharge or standby
– Patient category is changed to Adult or
Pediatric
– Arrhythmia monitoring is activated
– A different arrhythmia mode is selected
– Different ECG leads are selected for arrhythmia
processing
– The ARR processing setting is changed from
ECG1 to ECG1&2, if the leads selected for pro-
cessing are available
–The ARR lead 1 setting is changed to an avail-
able lead
–The ARR lead 2 setting is changed to an avail-
able lead, if the ARR processing setting is
ECG1&2
– A lead-off condition of a processed lead is re-
solved
– The neutral lead is changed
– A lead set is physically connected, if that lead
set provides the neutral or processed lead(s)
– The cable type is changed
– The OR Alarm setting is changed
– The M540 is docked in an IACS configuration
whose profile has a different ECG lead configu-
ration
– A standalone M540 is docked on an M500
whose profile has a different ECG lead configu-
ration
During the learning phase, which lasts
approximately 30 to 40 seconds, a relearning
message appears in the message field. In addition,
the message LEARN appears in the ECG
parameter field.
If ST monitoring is activated, ST deviations are also
recomputed during the learning phase.
Manual relearning
Relearn the QRS pattern of a patient when:
– Leads are reconnected or electrodes are
repositioned
– Eight hours have passed since the last learning
phase
– Questionable ARR calls appear on the ECG
– Other significant changes appear on the ECG
You can initiate a relearning phase from the
arrhythmia and the ST pages.
To relearn from the arrhythmia setup page
Select the heart rate parameter field to select
the ECG page.
or
NOTE
During the learning phase, only ASY and VF ar-
rhythmia events are reported.
NOTE
The relearn is initiated only on the available as-
signed lead(s).
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