In patients with cardiovascular implantable electronic devices, asynchronous pacing is necessary for surgeries with a risk of electromagnetic interference. Magnets are often used for asynchronous pacing. In this case report, magnet application to a Biotronik Evia DR-T pacemaker (Biotronik) programmed to a magnet response mode called automatic magnet mode (AUTO) led to a brief period of asynchronous pacing before reverting to prior settings, an unexpected response that was not revealed on the preoperative interrogation report.
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