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Related Experiment Videos

Autointerference of demand pulse generators.

S S Barold, P A Levine

Pacing and Clinical Electrophysiology : PACE

|May 1, 1981

Summary

This summary is machine-generated.

Demand pacemaker autointerference, originating within the pulse generator, can mimic lead fractures. This rare internal oversensing issue may prolong pacing intervals, challenging diagnosis and requiring consideration in pacemaker malfunction evaluations.

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Area of Science:

Cardiology
Biomedical Engineering
Medical Device Technology

Background:

Demand pacemakers are designed to pace only when the heart's intrinsic rhythm is insufficient.
Oversensing, where the pacemaker incorrectly detects non-cardiac signals as cardiac activity, can inhibit pacing.
Common causes of oversensing include lead fractures, insulation defects, or external electromagnetic interference.

Observation:

Two cases of demand pacemaker malfunction due to autointerference are presented.
Autointerference originated from internal signals within the pulse generator, not the lead or connection.
Magnet application, typically used to diagnose oversensing, failed to differentiate internal from external sources in these cases.

Findings:

Internal autointerference can lead to oversensing and inappropriate inhibition of demand pacing.

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The absence of surface electrocardiogram (ECG) interference and late onset mimicked lead issues.

This internal oversensing prolongs the spike-to-spike interval, indicating a potential pacemaker malfunction.

Implications:

Autointerference should be considered as a rare cause of pacemaker oversensing and pacing abnormalities.
Diagnostic approaches for pacemaker malfunction need to account for internal signal interference.
Further investigation into pulse generator design may be warranted to mitigate internal signal interference.