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EP News: Case Reports

  • T. Jared Bunch
    Correspondence
    Address reprint requests and correspondence: Dr T. Jared Bunch, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Utah School of Medicine, 30 North 1900 East, Room 4A100, Salt Lake City, UT 84132.
    Affiliations
    Division of Cardiovascular Medicine, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah
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Published:January 08, 2021DOI:https://doi.org/10.1016/j.hrthm.2021.01.003
      Both implantable cardioverter-defibrillators (ICDs) and pacemakers have magnet activated switches. Wearable devices are increasingly used in the community and continue to evolve in complexity, which augment the potential of interactions of these devices and implantable cardiac devices. Asher et al (https://doi.org/10.1016/j.hrcr.2020.12.002) shared a case of a 55-year-old woman with an ICD for recurrent ventricular arrhythmias in the setting of arrhythmogenic right ventricular cardiomyopathy. She purchased an Apple Watch to monitor her heart rate and activity. She received multiple nocturnal alerts from her ICD that indicated magnet mode activation. The authors studied 2 common wearable monitors with a similar Medtronic single-chamber ICD to determine distances at which magnet mode activation will be activated. The Fitbit and Apple Watch wristband magnets deactivated the ICD at distances of up to 2.4 and 2.0 centimeters, respectively. Comparatively the clinical magnets (donut and programmer head) would activate the magnet mode up to 7.0–8.0 cm. This case highlights the potential for implantable device inhibition related to magnet mode activation with 2 common direct-to-consumer wearable devices.
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