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A diathermy suppression filter for external pacemakers.

I Marshall1, D H Scott, I A Peaston

  • 1Department of Medical Physics and Medical Engineering, Royal Infirmary, Edinburgh, UK.

Journal of Medical Engineering & Technology
|July 1, 1990
PubMed
Summary
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Patients needing cardiac pacing during cardiothoracic surgery can maintain cardiac output during diathermy. Adding an LC filter to external pacemakers prevents interference from surgical diathermy, ensuring consistent pacing.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Surgery

Background:

  • Cardiothoracic surgery often necessitates cardiac pacing.
  • Surgical diathermy can disrupt external pacemaker function, leading to reduced cardiac output.

Purpose of the Study:

  • To evaluate the efficacy of an LC filter in maintaining cardiac output during surgical diathermy in patients requiring external cardiac pacing.

Main Methods:

  • Integration of a two-stage LC filter into the front end of external pacemakers.
  • Monitoring cardiac output during the application of surgical diathermy with and without the filter.

Main Results:

  • The LC filter effectively prevented interference from surgical diathermy.
  • Cardiac output was successfully maintained throughout the procedure when the filter was employed.

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Conclusions:

  • A simple LC filter is a viable solution to ensure continuous cardiac pacing and maintain cardiac output during cardiothoracic surgery involving diathermy.
  • This approach is applicable to various external pacemaker models.