Data Critical Corporation 02DT-7000 User Manual
TROUBLESHOOTING
220
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft
All information contained herein is subject to the rights and restrictions on the title page.
Example 14 - False Asystole Alarms with Paced Rhythms
Problem
False Asystole Alarms on Fused Beats
The following figure demonstrates one situation with pacemaker rhythms which may
result in a false positive asystole call. Note the absence of the N-beat annotations on
the lower strip. Remember, the pacer filter is enabled when the Process is set to Pacer.
The pacer filter setting controls the blanking interval that is applied before and after
the pacer flag to remove residual pacer artifact from the ECG signal. The default pacer
filter is 25 msec, which should be adequate for the majority of pacemaker signals from
the transceivers. In some cases, it may be necessary to increase or decrease the pacer
filter. If the pacer filter is changed from 25 msec, an increased level of surveillance
should be instituted.
result in a false positive asystole call. Note the absence of the N-beat annotations on
the lower strip. Remember, the pacer filter is enabled when the Process is set to Pacer.
The pacer filter setting controls the blanking interval that is applied before and after
the pacer flag to remove residual pacer artifact from the ECG signal. The default pacer
filter is 25 msec, which should be adequate for the majority of pacemaker signals from
the transceivers. In some cases, it may be necessary to increase or decrease the pacer
filter. If the pacer filter is changed from 25 msec, an increased level of surveillance
should be instituted.
Fig. 111. Example 14 - False Asystole Alarms
Annotated disclosure review can help differentiate which beat detection performance
issues may be attributed to pacer artifact or pacer filter problems. There should be one,
and only one, beat annotation associated with every QRS complex. In general, if the
system is calling false low rates or false asystole due to fused pacer rhythms (missing
beat annotations), then the pacer filter should be decreased to allow more of the QRS
complex through to the arrhythmia processor.
issues may be attributed to pacer artifact or pacer filter problems. There should be one,
and only one, beat annotation associated with every QRS complex. In general, if the
system is calling false low rates or false asystole due to fused pacer rhythms (missing
beat annotations), then the pacer filter should be decreased to allow more of the QRS
complex through to the arrhythmia processor.