User Manual

PACEMAKER PROCESSING

98 PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft

All information contained herein is subject to the rights and restrictions on the title page.

Fig. 42. False Asystole Alarms on Fused Beats

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. If there is a fused pacemaker spike on a narrow QRS

complex, the blanking may remove the QRS complex. If false low

rate or asystole alarms are observed, try decreasing the pacer filter.

WHAT THE USER SEES

The displayed and printed data show the unfiltered data. There

should be an annotation (N,V,etc.) associated with each detected beat

in the 24 hour data. If missing annotations are noted on fused beats,

decreasing the pacer filter may allow more of the QRS complex

through to the arrhythmia module.

FILTER TOO HIGH FILTER OK

FALSE ASYSTOLE ALARMS ON FUSED BEATS

WHAT THE ARRHYTHMIA SEES

The filtered data is passed to the arrhythmia module. Note that if the

pacer filter is too high some or all of the QRS complex may be

blanked resulting in false asystole or low rate calls.