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Related Experiment Videos

Electrical safety during electrophysiological testing.

S A Rubin1, P C Nalos, S Solingen

  • 1Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, CA 90048.

Pacing and Clinical Electrophysiology : PACE
|May 1, 1988
PubMed
Summary

A malfunctioning cardiac stimulator caused dangerous arrhythmias during an electrophysiological study. Improved device safety is crucial to prevent harm from power fluctuations during cardiac procedures.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Invasive electrophysiological studies are critical for diagnosing cardiac arrhythmias.
  • Programmable cardiac stimulators are essential tools in these procedures.
  • Device reliability is paramount for patient safety during cardiac interventions.

Observation:

  • A programmable cardiac stimulator malfunctioned during a power outage.
  • The device delivered high-frequency pulses to the myocardium upon power restoration.
  • This malfunction led to the inadvertent induction of atrial and ventricular arrhythmias.

Findings:

  • The stimulator malfunctioned when line voltage dropped below 65 VAC and then resumed.
  • Bench testing revealed continuous high-frequency output (>= 1 mA) post-voltage drop.

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  • The device failure resulted in non-sustained atrial and ventricular arrhythmias.

    • Implications:

    • Electrical safety standards for cardiac stimulators need enhancement.
    • Stimulator designs must be immune to power fluctuations and detect abnormal conditions.
    • Ensuring device resilience is vital for preventing patient harm during electrophysiological testing.