Clinical Research Directory

Multimodality Location Prediction Accuracy of Leadless Pacemaker Positioning

One of the most serious complications with leadless pacemaker (LP) implants is right ventricle (RV) perforation. Understanding the accuracy of fluoroscopic guidance of implants compared to transthoracic echocardiograms (TTE) and computed tomography angiography (CTA) of the heart will help guide future implant techniques. We hypothesize that TTE-guided implantation would lead to improved safety and accuracy of leadless pacemaker implants. The implanter and two independent electrophysiologists will estimate the location of the implant based on standard fluoroscopic views using RV site nomenclature after the procedure. Each participant will then undergo a TTE and have 3 independent assessments of the implant site. Within 48 hours of the implant, a CTA of the heart will then be performed with contrast, which will serve as the gold standard to determine the actual implant site. The primary endpoint will compare implanting electrophysiologist, fluoroscopy, and TTE predicted location of a new implanted Micra VR or AV2 leadless pacemaker to the implant location found on a gold standard CTA of the heart. The secondary endpoints will compare implant technique (Jugular vs. Femoral) by defining timing of implant procedure, repositioning, and accuracy of predicted implant location. The other secondary endpoints will compare baseline and demographic characteristics (BMI, COPD, LVEF, implant technique) to EKG parameters at final position, fluoroscopy and TTE image quality, acquisition of triangle or Koch and Bachmann area view during TTE.