ECG and Heart Rate
VF4 Infinity Gamma Series Page 8-21
AV Sequential or DDD Pacemakers
For pacemaker patients, follow these steps:
! Always attach at least four electrodes to allow for a choice of
leads.
! Turn pacer detection on.
! Select the lead with the highest R-wave and the least interfer-
ence.
! Verify that the HR calculation is accurate by comparing it to
the ECG waveform.
! Monitor the pulse or the respiration or both using a method
other than ECG.
For patients without pacemakers, turn the pacer detection off.
Pacemakers with Impedance-Derived Rate
Response
These pacemakers emit pulses for the purpose of adjusting the
pacer rate to the patient’s respiration rate. The monitor may clas-
sify such impedance spikes as pacer spikes and display them in
very short, regular intervals superimposed on the patient’s ECG.
For patients with pacemakers, change the electrode placement
until the impedance spikes shrink in size or disappear.
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