Unexpected Coronary Sinus Embolization of a Leadless Pacemaker due to Initial Device Failure: A Case Report

Leadless pacemakers reduce complications compared to transvenous systems, but device dislodgement and embolization can occur. We report an 81‐year‐old man with atrial fibrillation and bradycardia who underwent Micra implantation. Because of inner shaft damage and insufficient tine fixation, the device embolized into the coronary sinus. It was successfully retrieved using a double‐snare technique, and a new device was implanted. This case highlights the importance of meticulous deployment technique and thorough intraprocedural assessment of device attachment, as well as troubleshooting strategies for unexpected embolization.