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RÉSUMÉABSTRACT Determining fitness to work after implantation of a cardiac defibrillator in a worker exposed to magnetic fields. An EDF worker potentially exposed to high-intensity 50 Hz magnetic fields had a cardiac defibrillator implanted. Theoretically its operation could be disturbed by magnetic field exposure at work. We use this case study to present an approach to evaluating work safety and the worker's fitness in such situations. The protocol consisted of measuring the magnetic field at the different places where the worker performed his job duties, in his presence, and simultaneously monitoring the operation of the device. The Medtronic device was programmed in bipolar mode. Throughout the workplace, the maximal magnetic field intensity measured at the device level was 650 µT. No dysfunction was recorded in bipolar mode. Following these measurements and device controls, the worker was declared fit and resumed his previous job. Two years later, no incident has been reported.

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