Cardiac Synchronization and Tricuspid Regurgitation With Leadless Pacemaker

Exclusion Criteria

• •1. Patients with inferior vena cava thrombus, a cancer thrombus, an abnormal inferior vena cava;
• •2. Patients with femoral vein stenosis and tortuosity failed to accommodate the pacemaker delivery system;
• •3. Patients with myocardial infarction;
• •4. Patients who have been implanted with devices that affect the pacemaker delivery system, such as vena cava filters or tricuspid valve mechanical valves;
• •5. cannot understand or are unwilling to give informed consent.