Author + information
- Received August 22, 2004
- Accepted October 18, 2004
- Published online March 15, 2005.
- Alexandre Trigano, MD*,* (, )
- Olivier Blandeau, BS*,
- Martine Souques, MD†,
- Jean Pierre Gernez, BS‡ and
- Isabelle Magne, PhD‡
- ↵*Reprint requests and correspondence:
Dr. Alexandre Trigano, Centre Hospitalier Universitaire Nord, Hôpital Nord, 13915 cedex 20, Marseille, France
Objectives This study examined the risk of interference by high magnetic flux density with permanent pacemakers.
Background Several forms of electromagnetic energy may interfere with the functions of implanted pacemakers. No clinical study has reported specific and relevant information pertaining to magnetic fields near power lines or electrical appliances.
Methods A total of 250 consecutive tests were performed in 245 recipients of permanent pacemakers during 12-lead electrocardiographic monitoring. A dedicated exposure system generated a 50-Hz frequency and maximum 100-μT flux density, while the electrical field was kept at values on the order of 0.10 V/m.
Results A switch to the asynchronous mode was recorded in three patients with devices programmed in the unipolar sensing configuration. A sustained mode switch was followed by symptomatic pacing inhibition in one patient. No effect on devices programmed in bipolar sensing was observed, except for a single interaction with a specific capture monitoring algorithm.
Conclusions The overall incidence of interaction by a magnetic field was low in patients tested with a wide variety of conventionally programmed pacemaker models. A magnetic field pulsed at power frequency can cause a mode switch and pacing inhibition in patients with devices programmed in the unipolar sensing configuration. The risk of interference appears negligible in patients with bipolar sensing programming.
This work was supported by a grant from Le Réseau de Transport de l'Electricité and Electricité de France, Department of Medical Studies, Paris, France.
- Received August 22, 2004.
- Accepted October 18, 2004.
- American College of Cardiology Foundation