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.

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We report the observation of interference between an implanted loop recorder and a cellular telephone when the latter was placed over the subcutaneous pocket. The artifact produced during the ringing of the telephone was automatically recorded and stored in the device memory. A similar interference was documented during ex vivo testing.

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