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Reversion mode activation by myopotential sensing in a ventricular inhibited demand pacemaker.
Pacing and Clinical Electrophysiology : PACE
|January 1, 1985
Summary
Pacemaker sensing issues were resolved by adjusting sensitivity settings. Myopotential interference, causing pacemaker malfunction, was identified and corrected, restoring normal function.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Pacemaker malfunction can significantly impact patient health.
- Understanding lead-patient interaction is crucial for device efficacy.
Observation:
- A 72-year-old woman experienced intermittent pacemaker failure to sense and pace.
- Standard troubleshooting including reprogramming sensitivity and lead repositioning were ineffective.
Findings:
- Holter monitoring revealed pacemaker failures coincided with baseline artifact, identified as myopotentials.
- Inappropriate pacing spikes at 90 ppm suggested myopotential sensing alternately inhibited pacing and activated a reversion mode.
Implications:
- Myopotential interference can mimic intrinsic cardiac signals, leading to inappropriate pacemaker behavior.
- Adjusting pacemaker sensitivity is a key strategy for managing myopotential-induced malfunctions.
- This case highlights the importance of thorough artifact analysis in pacemaker follow-up.