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Fluoroscope-generated electromagnetic interference in an external demand pacemaker: report of a case
Circulation
|March 1, 1977
Summary
Electromagnetic interference disrupted a temporary pacemaker by oversensing faulty fluoroscopy signals. This highlights the need for continuous monitoring and equipment maintenance in pacemaker patients.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Physics
Background:
- Temporary external pacemakers are crucial for managing cardiac arrhythmias during procedures.
- Electromagnetic interference (EMI) poses a potential risk to pacemaker function.
- Demand pacemakers rely on sensing intrinsic cardiac activity to pace appropriately.
Observation:
- A 70-year-old male patient experienced pacemaker inhibition and resetting during permanent pacemaker implantation.
- The temporary external pacemaker, a ventricular-inhibited type, was affected by EMI.
- The interference originated from a faulty fluoroscopy unit used near the pacing equipment.
Findings:
- The arrhythmia was caused by oversensing of simulated myocardial potentials from the fluoroscopy unit.
- The faulty fluoroscopy unit emitted modulated waveforms that mimicked cardiac signals.
- This event demonstrates a specific mechanism of EMI affecting demand pacemaker circuitry.
Implications:
- Continuous patient monitoring is essential when using external demand pacemakers.
- Rigorous maintenance and testing of all electrical equipment in proximity to pacemakers are critical.
- Understanding EMI sources is vital for preventing pacemaker malfunction and ensuring patient safety.