IRVINE, Calif., Feb. 4, 2019 — Johnson & Johnson Medical Devices Companies announced today that Biosense Webster, Inc., a worldwide leader in the diagnosis and treatment of heart arrhythmias, has enrolled and treated the first patient in its U.S. Investigational Device Exemption (IDE) study which evaluates the company's QDOT MICRO Radiofrequency (RF) Ablation Catheter used for the treatment of symptomatic drug-refractory paroxysmal atrial fibrillation (AF).