8-20 Infinity Vista VF6
8 ECG AND HEART RATE
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 classify 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.
Large Amplitude Pacer Pulses
Transcutaneous Electrical Nerve Stimulators (TENS)
TENS signals are similar to pacemaker spike signals and may be accidentally labeled
as such by the monitor.
WARNING: Some pacemakers, especially external
pacemakers, emit pulses with amplitudes far exceeding those
shown in the pacer pulse rejection table. The monitor may
misinterpret such pulses as valid QRS complexes and may
fail to detect cardiac arrest.
WARNING: Valid QRS complexes following mislabeled TENS
signals could be rejected. The result may be false asystole or
low heart rate alarms. If TENS signals continue to be
interpreted as pacer spikes, turn the pacer detection off.
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