Leadless Pacemaker With Acute but Transient Elevation of Lead Impedance and Pacing Threshold

Leadless pacemakers (LPMs) offer an advantage over traditional pacemakers that require creation of a generator pocket and connection of the transvenous leads, which may lead to complications. However, device dislodgement, car-diac perforation, and pacing-threshold elevation requiring percutaneous retrieval and device replacement have been reported as serious adverse events occuring with use of LPMs.1 Herein, we report the case of an LPM-implanted patient who experienced a transient and acute elevation of impedance and pacing threshold. These symptoms improved without requiring device replacement.