When Legacy Triumphs: Resolving Leadless Pacemaker Programming Failure Caused by Loop Recorder Interference

The growing prevalence of co-implanted cardiac electronic devices increases the potential for clinically significant interactions. We describe the case of an 81-year-old man with a Biotronik BIOMONITOR IV implantable loop recorder (ILR) who required a Medtronic MICRA VR leadless pacemaker. Post-implantation, interrogation with the modern Medtronic SmartSync programmer failed due to suspected electromagnetic interference from the ILR. Communication was successfully established using the older Medtronic CareLink 2090 programmer. This report highlights a unique instance of inter-device interference, underscoring the importance of understanding programmer technology and device compatibility in complex clinical scenarios.