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Related Experiment Videos

Pacemaker interference by magnetic fields at power line frequencies.

Trevor W Dawson1, Kris Caputa, Maria A Stuchly

  • 1Department of Electrical and Computer Engineering, University of Victoria, BC, Canada.

IEEE Transactions on Bio-Medical Engineering
|March 6, 2002
PubMed
Summary
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External 50/60-Hz electric and magnetic fields can interfere with pacemakers. Numerical modeling of induced electric fields in pacemaker leads helps assess this electromagnetic interference (EMI).

Area of Science:

  • Biomedical Engineering
  • Computational Electromagnetics
  • Medical Physics

Background:

  • External 50/60-Hz electric and magnetic fields induce internal electric fields in the human body.
  • These induced fields pose a risk of interference with implanted electronic medical devices, particularly pacemakers.

Purpose of the Study:

  • To numerically model and quantify electromagnetic interference (EMI) in pacemakers due to external 50/60-Hz fields.
  • To adapt existing computational codes for simulating thin conducting wires (pacemaker leads) within the body.

Main Methods:

  • Modification of a scalar-potential finite-difference frequency-domain code to incorporate pacemaker leads.
  • Numerical computation of induced electric fields for two lead configurations (atrial and ventricular) under three orthogonal 60-Hz magnetic field orientations.

Related Experiment Videos

  • Comparison of numerical results with simplified Faraday's law estimations.

    • Main Results:

    • Quantified worst-case EMI levels: approximately 40 microT for atrial electrodes and 140 microT for ventricular electrodes.
    • Demonstrated limitations of simplified Faraday's law approaches for complex lead geometries.
    • Validated the numerical modeling technique for assessing pacemaker EMI.

    Conclusions:

    • Numerical modeling provides a viable method for assessing EMI risks in pacemakers from external fields.
    • The developed technique can be extended to analyze interference with other implanted devices, such as cardiac defibrillators.