User Manual

PACEMAKER PROCESSING
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft 97
All information contained herein is subject to the rights and restrictions on the title page.
Determining Pacer Filter Blanking Periods
WARNING: If the pacer filter is changed from 25 ms, an increased level of surveillance
should be instituted.
Note: This feature availability is configurable. If the Pacer Filter button is not avail-
able, then see your system administrator for details.
The pacer filter is enabled when Process is set to Pacer. The pacer filter setting con-
trols the blanking interval, 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 PatientNet transceivers. In
some cases, it may be necessary to increase or decrease the pacer filter. If the pacer fil-
ter is changed from 25 msec, an increased level of surveillance should be instituted.
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 Asystoles, due to fused beats (missing beat
annotations), then the pacer filter should be decreased (fig. 42). If the system is calling
false high rates due to the detection of pacer artifact as beats (more than one annota-
tion per beat), then the pacer filter should be increased (See Figure 43 on page 99).
Note: The pacer filter does not affect pacer detection