User Manual

PACEMAKER PROCESSING
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft 99
All information contained herein is subject to the rights and restrictions on the title page.
Fig. 43. False High Rates Due to Detection of Beats on Pacer Artifact
HOW TO VISUALIZE THE EFFECT OF THE
PACER FILTER
The pacer filter controls how much data is blanked on both sides of a
detected pacemaker spike. The blue flag indicates the position where
the spike was detected. The red line represents the region of pacer
blanking.
WHAT THE USER SEES
The displayed and printed data show the unfiltered data. There
should be one and only one annotation (N,V,etc.) associated with
each QRS beat in the 24 hour data. If there is more than one
annotation per beat and the additional annotation(s) are near the
residual pacer artifact, increasing the pacer filter (blanking period)
will result in more of the artifact being blanked which reduces the
likelihood of the artifact being detected as a beat.
FILTER TOO LOW
FILTER OK
FALSE HIGH RATES DUE TO DETECTION OF
BEATS ON PACER ARTIFACT
WHAT THE ARRHYTHMIA SEES
The filtered data is passed to the arrhythmia module. Note that if the
pacer filter is too low, the pacer artifact is passed to the arrhythmia.
If the artifact is significant, the arrhythmia may detect it as a beat,
resulting in false high heart rates.
Q N
N