Electrophysiological Procedures & Treatments Diagnose it. Electrophysiology study Treat it. Cardiac ablation Diagnose it. Loop recorder Treat it. Pacemaker implant Treat it. Site selective pacing Treat it. Leadless pacemakers Prevent it. Defibrillator implantation Prevent it. Subcutaneous defibrillators Treat and Prevent it. Biventricular device implantation Prevent it. Left atrial appendage closure