False remote monitoring alerts from explanted cardiac implantable electronic device: How is this possible?

A 72-year-old woman with a dual-chamber implantable cardioverter-defibrillator (Biotronik Lumax 540 DR-T) at elective replacement indicator presented for generator replacement. A new MicroPort generator (Platinium DR) was attached to her existing leads. Eight days later, multiple red alert messages were received on the Biotronik remote monitoring system from the explanted generator. Investigations revealed alert transmission via a CardioMessenger Smart mobile device registered to another patient that came into proximity of the explanted generator. The Biotronik remote monitoring system is unique in that red alerts could be sent through any CardioMessenger Smart device regardless of whether they were paired.